CBSE Class 10 Science — How do Organisms Reproduce?

In human beings, the implantation of fertilised egg takes place in which part of female reproductive system?

Identify the type of reproduction shown in the diagram given below:

Yeast multiplies by which of the following methods?

Identify the correct statement for spirogyra, leishmania and hydra:

Assertion (A): Bacteria produced as a result of asexual reproduction would be similar. Reason (R): There would be only minor differences between the bacteria generated due to small inaccuracies in DNA replication.

Draw a neat diagram to show germination of pollen on the female reproductive part of the flower. Name and label only the following parts: (a) The part that receives the pollen grain. (b) The structure that carries the male germ cell to reach the female germ cell.

(a) Given below are certain situations. Analyse each and describe its possible impact: (i) A population of bacteria living in temperate waters whose temperature increased by global warming. (ii) The sperm encounters the egg when it reaches the oviduct in human females. (iii) Self pollination does not occur in a flower that contains only pistil. (iv) Egg does not get fertilised in a human female. (v) When the seed is placed under appropriate condition of water and air in the soil? OR (b) Given below are certain situations. Analyse and describe what would happen when: (i) Spores are liberated from blob-like structures of the bread mould? (ii) Leaves of bryophyllum fall on wet soil? (iii) A pollen from different species land on the stigma of totally unrelated species? (iv) Copper-T is placed in the uterus of a human female? (v) Spirogyra breaks into smaller fragments upon maturation?

(A) (i) Sugarcane does not produce seeds so name the process through which it will be able to reproduce. (ii) List any two advantages of this method. (iii) Besides sugarcane, give two more examples of plants that reproduce by this method. (iv) Why regeneration is not possible in all the types of animals? OR (B) (i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the pollen tube fuse with the female gamete, present in the embryo sac. This results in lot of changes in different parts of the flower. State the changes taking place in the following structures of flower post fertilization: (a) Zygote (b) Ovule (c) Ovary (d) Sepals (ii) Define germination.

Match Column-I with Column-II and select the correct option from the choices provided. Column-I | Column-II a. Site of fertilisation of egg with the sperm b. Site of implantation of embryo c. Site of entry of sperm into the female reproductive tract d. Site through which the waste materials generated by the developing embryo are removed (i) Vagina (ii) Uterus (iii) Oviduct (iv) Placenta (v) Cervix

Plants like rose and banana have lost the capacity to produce :

In a bisexual flower the male gametes are present in the :

Select a pair of bisexual flowers from the following:

Bryophyllum produces new plant through:

Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II: Column I: P. Leishmania, Q. Spirogyra, R. Planaria, S. Plasmodium Column II: 1. Regeneration, 2. Multiple Fission, 3. Binary Fission, 4. Fragmentation, 5. Budding

The correct/true statement(s) for a bisexual flower is/are : (i) They possess both stamen and pistil. (ii) They possess either stamen or pistil. (iii) They exhibit either self-pollination or cross-pollination. (iv) They cannot produce fruits on their own.

The modes of reproduction in Spirogyra and Planaria respectively are

The number of chromosomes in a cell division is halved. This kind of cell division is observed in:

Assertion (A) : The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. Reason (R) : Placenta is a disc which is embedded in the uterine wall.

Give reasons : (a) The male reproductive organ responsible for formation of germ cells is located outside the abdominal cavity. (b) The roles of the glands, present along the path of the vas-deferens, are very significant.

Draw labelled diagrams to show different stages of budding in Hydra.

(a) Write one function each of the following, in a seed: (i) Seed coat (ii) Cotyledon (iii) Radicle (iv) Plumule OR (b) Write the main steps to culture yeast in the laboratory.

(a) Define fertilisation. (b) What happens to Zygote, Ovule, Ovary and Stamens after fertilisation in a flowering plant?

(A) (i) What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur in the latter? (ii) Water in a pond appears dark green and contains filamentous structures. Name these structures and the method by which they reproduce. Explain the process. OR (B) (i) Name the part performing following functions in human male reproductive system: (a) Carries sperm (b) Production of male gametes (c) Whose secretion makes the transport of sperms easier (d) Provide suitable temperature for sperm formation (ii) Write any two characteristics of sperms. (iii) What are surgical contraceptive methods? Give the side effect caused by this procedure.

(a) Define Puberty. List any two changes seen in boys at the time of puberty. (b) Why are testes in human males located outside the abdominal cavity in scrotum? (c) List any three techniques of contraception used by humans. Which one of these is not meant for males? OR (a) Name the part performing following functions in human female reproductive system: (i) production of eggs (ii) site of fertilization (iii) site of implantation (iv) entry of the sperms (b) What changes are observed in the uterus: (i) subsequent to implantation of zygote and (ii) if an egg does not get fertilized?

(a) (i) Identify the parts 'X' and 'Y' in the figure given below : (ii) Name the yellowish coloured structures produced by the part labelled as 'Y'. (iii) Write the name of the process by which these are transferred to the part labelled as 'X'. (iv) Explain the process of seed formation in a flowering plant. OR (b) (i) Name the type of asexual mode of reproduction shown in the given figure. (ii) Identify the unicellular organism in the diagram. (iii) List any two advantages of asexual reproduction over sexual reproduction. (iv) Name and explain any one mode of asexual reproduction observed in Hydra.

When a girl is born, the ovaries already contain thousands of immature eggs. On reaching puberty, some of these start maturing. One matured egg is released every month by one of the ovaries. The two oviducts unite into an elastic bag-like structure known as uterus. (a) Write the site of fertilization in human female. [1] (b) How does the uterus prepare itself to receive and nurture the growing embryo? Explain. [1] (c) (i) What happens when the egg is not fertilized? [2] OR (c) (ii) How does the developing embryo get nutrition from the mother's blood? Explain. [2]

The plants that can be raised by the method of vegetative propagation are:

The part of seed which is a source of food during germination of seed is:

Part(s) of a flower which attracts insects for pollination is (are)

The incorrect statement about placenta is :

A zygote is formed by the fusion of a male gamete and a female gamete. The number of chromosomes in the zygote of a human is :

Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread : (i) Formation of large number of spores (ii) Presence of moisture and nutrients in bread (iii) Low temperature (iv) Presence of hyphae

Identify the mode of asexual reproduction in the following organism :

Assertion (A): Offsprings produced by asexual reproduction are genetically similar to the parents. Reason (R): Asexual reproduction involves a single parent.

"Stability of DNA in a species is ensured during sexual reproduction." Justify the statement.

The survival of a species is promoted through creation of variations. Illustrate with an example.

Some unicellular organisms such as Plasmodium and Leishmania differ in the manner in which they reproduce. Name and explain the reproductive process taking place in them.

(a) Explain with the help of a labelled diagram, the process of reproduction in Hydra by budding. Name the cells used for reproduction in this process. OR (b) List two roles of each of the following in human reproductive system: (i) Seminal vesicles and prostate gland (ii) Oviduct (iii) Testis

Explain the events that take place once a sperm reaches the oviduct till it becomes a foetus. Write the role of placenta in pregnancy.

(a) (i) What are spores? On which structures are they formed? How do they overcome unfavourable conditions? Name the organism which multiplies with the help of these structures. (ii) Give two reasons why some plants are grown by the method of vegetative propagation. List two methods used to grow plants vegetatively. OR (b) (i) Study the diagram given below and name the parts marked as A, B and C. What happens when B reaches C in the ovary? Mention its significance. (ii) Write the post fertilisation changes that occur in a flower.

Asexual reproduction involves a single parent to produce offsprings without the formation of gametes. It occurs by the following ways: Fission, Budding, Fragmentation, Spore formation and Regeneration. In one of the methods like regeneration, Planaria A is cut horizontally into three pieces - L, M and N and Planaria B is cut vertically into two equal halves - O and P. (a) Which of the cut pieces of the two Planaria could regenerate to form a complete organism? (b) Give an example of another organism which follows the same mode of reproduction as Planaria. (c) What is the meaning of 'development' in regeneration? OR (c) Differentiate between regeneration and fragmentation.

Pollination is an important process in sexual reproduction of plants. It is an essential process that facilitates fertilisation in plants. Pollinating agents can be wind, water, insects and birds. Several changes take place in the flower after the fertilization has taken place. (a) Write the main difference between self-pollination and cross-pollination. (b) Name the part of the flower which attracts insects for pollination. What happens to this part after fertilisation? (c) (i) Define fertilisation. What is the fate of ovules and the ovary in a flower after fertilisation? OR (c) (ii) In a germinating seed, which parts are known as future shoot and future root? Mention the function of cotyledon.

Observe the following diagram and identify the process and its significance from the following options :

Plants which bear unisexual flowers are :

The number of chromosomes in parents and offsprings of a particular species undergoing sexual reproduction remain constant due to :

Select the INCORRECT match (between the plant and its vegetative part) from the following:

The bacterial and the viral infections that may be caused due to unsafe sex respectively are:

(i) Name and explain the two modes of asexual reproduction observed in hydra. (ii) What is vegetative propagation ? List two advantages of using this technique.

(a) (i) Where are testes located in the human males and why? State two function of the testes. (ii) In the human female, one of the ovaries releases an egg every month. State the changes that take place if (1) the egg is fertilized, and (2) the egg is not fertilized. (iii) What is done during the surgical method in males and females to prevent pregnancy? OR (b) (i) What happens when : (1) Leaves of Bryophyllum fall on the soil ? (2) Planaria is cut into many pieces ? (3) Sporangia of Rhizopus on maturation liberate spores ? Mention the modes of reproduction in each of the above three cases. (ii) Write the changes that occur in a flower once the fertilisation has taken place.

(a) Name the parts of a bisexual flower that are not directly involved in reproduction. (b) Differentiate between self pollination and cross pollination. List any two significance of pollination. (c) What is the fate of ovules and ovary after fertilization in a flower?

Give reason for the following : (a) During reproduction inheritance of different proteins will lead to altered body designs. (b) Fertilization cannot take place in flowers if pollination does not occur. (c) All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration. (d) Vegetative propagation is practised for growing only some type of plants. (e) The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.

All the reproductive methods of living organisms are broadly categorized into two types: 1. Asexual reproduction, and 2. Sexual reproduction. Asexual reproduction involves the participation of a single parent without the formation of gametes, fertilisation and transfer of genetic material. This method is a common means of rapidly increasing offsprings under favourable conditions. (a) Name the type of fission that occurs in Leishmania and Plasmodium. (b) Write one advantage of sexual mode of reproduction over asexual reproduction. (c) Give reasons why: (i) Colonies of yeast fail to multiply in water but multiply in sugar solution. (ii) Rhizopus individuals do not grow on a dry slice of bread. OR (c) Name the filamentous structures a student could identify when he collected water from a pond that appeared dark green. How do these organisms multiply? Explain.

(a) Which of the following flowers will have higher possibility of self-pollination ? Mustard, Papaya, Watermelon, Hibiscus (b) List the two reproductive parts of a bisexual flower.

Give reasons : (i) Placenta is extremely essential for foetal development. (ii) Uterine lining becomes thick and spongy after fertilisation.

Which one of the two multicellular organisms — Spirogyra and Planaria reproduces by regeneration and why ? Give an example of any other organism which can also reproduce by the same process.

Mention the functions of (a) Placenta (b) Fallopian tubes (c) Uterus and (d) Ovary in the human female reproductive system.

(a) Name the reproductive and non-reproductive parts of bread mould (Rhizopus). (b) List any two advantages of vegetative propagation.

Name the reproductive parts of an angiosperm. Where are these parts located? Explain the structure of its male reproductive part.

Suggest any two contraceptive methods to control the size of human population and explain them.

OR What is puberty? Mention any two changes that are common to both boys and girls in early teenage years.

(a) Differentiate between binary fission in Amoeba and binary fission in Leishmania. (b) How does reproduction take place in malarial parasite?

Name the part/organ of the human female reproductive system: (a) where contraceptive devices such as loop or copper-T are placed to prevent pregnancy. (b) which is blocked to prevent the transfer of eggs. (c) where formation of green cells as ova takes place. (d) from where the embryo gets nutrition from the mother's blood.

(a) Mention one function each of the following organs in human male reproductive system: (i) Testis (ii) Scrotum (iii) Vas deferens (iv) Prostate gland (b) Name the type of germ cell which (i) is motile, and (ii) stores food.

In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary. Explain with the help of a labelled diagram (only concerned parts), how the male germ cell reaches the ovary.

The modes by which various organisms reproduce depend on the body design of the organisms. In asexual reproduction, a single individual parent produces offsprings without the involvement of gametes. This method is a common means of increasing the offsprings rapidly under favourable conditions. Asexual reproduction occurs mostly in unicellular organisms, some plants and certain simple multicellular animals. (a) State the name of the organism in which binary fission takes place in a definite orientation. Also name the disease caused by this organism. (1 mark) (b) List any two advantages of producing plants through vegetative propagation. (1 mark) (c) (i) Explain the process of budding in Hydra. (2 marks) OR (ii) What happens when (I) a spirogyra filament matures and attains a considerable length, and (II) a sporangia in Rhizopus bursts on maturation? (2 marks)

Answer question numbers 3(a) to 3(d) on the basis of your understanding of the following paragraph and the related studied concepts. The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population. (a) List two common signs of sexual maturation in boys and girls. (1 mark) (b) What is the result of reckless female foeticide? (1 mark) (c) Which contraceptive method changes the hormonal balance of the body? (1 mark) (d) Write two factors that determine the size of a population. (1 mark)

Fertilisation is the process of

Define the term pollination. Differentiate between self pollination and cross pollination. What is the significance of pollination?

(a) What provides nutrition to human sperms? State the genetic constitution of a sperm. (b) Mention the chromosome pair present in zygote which determines the sex of (i) a female child, and (ii) a male child.

What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.

(a) List three different categories of contraception methods. (b) Why has Government of India prohibited prenatal sex determination by law? State its benefits in the long run. (c) Unsafe sexual act can lead to various infections. Name two bacterial and two viral infections caused due to unsafe sex.

Based on the given diagram answer the questions given below : (a) Label the parts A, B, C and D. (b) Name the hormone secreted by testis and mention its role. (c) State the functions of B and C in the process of reproduction.

OR (a) Name the mode of reproduction of the following organisms and state the important feature of each mode : (i) Planaria (ii) Hydra (iii) Rhizopus (b) We can develop new plants from the leaves of Bryophyllum. Comment. (c) List two advantages of vegetative propagation over other modes of reproduction.

Draw a neat diagram showing fertilisation in a flower and label (a) Pollen tube, (b) Male germ cell and (c) Female germ cell, on it. Explain the process of fertilisation in a flower. What happens to the (i) ovary and (ii) ovule after fertilisation? OR (a) What is puberty? (b) Describe in brief the functions of the following parts in the human male reproductive system: (i) Testes (ii) Seminal vesicle (iii) Vas deferens (iv) Urethra (c) Why are testes located outside the abdominal cavity? (d) State how sperms move towards the female germ cell.

(a) Draw a diagram showing germination of pollen on stigma of a flower and mark on it the following organs/parts: (i) Pollen Grain (ii) Pollen tube (iii) Stigma (iv) Female germ cell (b) State the significance of pollen tube. (c) Name the parts of flower that develop after fertilization into: (i) Seed (ii) Fruit OR (a) "Use of a condom is beneficial for both the sexes involved in a sexual act." Justify this statement giving two reasons. (b) How do oral contraceptive help in avoiding pregnancies? (c) What is sex selective abortion? How does it affect a healthy society? (State any one consequence)

OR: (a) In the female reproductive system of human beings, state the functions of (i) ovary (ii) oviduct (b) Mention the changes which the uterus undergoes, when (i) it has to receive a zygote. (ii) no fertilization takes place. (c) State the function of placenta.

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.

(a) Write the function of following parts in human female reproductive system: (i) Ovary (ii) Oviduct (iii) Uterus (b) Describe in brief the structure and function of placenta. OR (a) A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it. (b) Why do stars twinkle? Explain. OR (a) Write the function of each of the following parts of human eye: (i) Cornea (ii) Iris (iii) Crystalline lens (iv) Ciliary muscles (b) Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an astronaut on the Moon? Give reason to justify your answer. OR (a) State Fleming’s left hand rule. (b) Write the principle of working of an electric motor. (c) Explain the function of the following parts of an electric motor. (i) Armature (ii) Brushes (iii) Split ring

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence. OR A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes. (in proper sequence)

List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

List the two types of reproduction. Which one of the two is responsible for bringing in more variations in its progeny and how?

(a) Write the functions of each of the following parts in a human female reproductive system: (i) Ovary (ii) Uterus (iii) Fallopian tube (b) Write the structure and functions of placenta in a human female.

Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement.

Describe reproduction by spores in Rhizopus.

Draw in sequence (showing the four stages), the process of binary fission in Amoeba.

What are those organisms called which bear both the sex organs in the same individual. Give one example of such organism.

List two functions of ovary of human female reproductive system.

Define reproduction. How does it help in providing stability to the population of species?

Explain the term “Regeneration” as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra.

(a) List two reasons for the appearance of variations among the progeny formed by sexual reproduction. (i) Name the part marked ‘A’ in the diagram. (ii) How does ‘A’ reaches part ‘B’? (iii) State the importance of the part ‘C’. (iv) What happens to the part marked ‘D’ after fertilisation is over?

In the context of reproduction of species state the main difference between fission and fragmentation. Also give one example of each.

What is placenta? Describe its structure. State its functions in case of a pregnant human female.

A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below: Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon. On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:

A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams, of what he observes, in a proper sequence.

List two functions performed by the testis in human beings.

What is DNA copying? State its importance.

Explain budding in hydra with the help of labelled diagrams only.

List any four methods of contraceptions used by humans. How does their use have a direct effect on the health and prosperity of a family.

Write the functions of the following in human female reproductive system: Ovary, oviduct, uterus. How does the embryo get nourishment inside the mother's body? Explain in brief.

A student indentified the various parts of an embryo of a gram seed and listed them as given below: (I) Testa (II) Plumule (III) Radicle (IV) Cotyledon (V) Tegman. Out of these the actual parts of the embryo are:

Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Draw the initial and the final stages of this type of reproduction. State the event with which this reproduction starts.

“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement.

Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Explain how the transmission of such diseases be prevented?

(a) List three distinguishing features between sexual and asexual types of reproduction. (b) Explain why variations are observed in the offsprings of sexually reproducing organisms?

(a) Identify A, B and C in the given diagram and write their functions. (b) Mention the role of gamete and zygote in sexually reproducing organisms.

A student after observing a slide showing different stages of binary fission in Amoeba draws the following diagrams. However these diagrams are not in proper sequence. The correct sequence is:

Select the correct statements for the process of budding in yeast: I. A bud arises from a particular region on a parent body. II. A parent cell divides into two daughter cells, here the parental identity is lost. III. Before detaching from the parent body a bud may form another bud. IV. A bud when detaches from the parent body grows into a new individual.

In the figure, the parts marked A, B and C are sequentially:

Name an organism which reproduces by spore formation. List three conditions favourable for spores to germinate and grow.

List two advantages of practising vegetative propagation in plants. Select two plants raised by this method from the list given below: banana, gram, pea, rose, tomato, wheat

State the role of placenta in the development of embryo.

List the parts of human male reproductive system which contribute fluid to the semen. State two advantages semen offers to the sperms.

List two advantages of vegetative reproduction practised in case of an orange plant.

What is AIDS? Which microbe is responsible for AIDS infection? State one mode of transmission of this disease. Explain in brief one measure for the prevention of AIDS.

List and explain in brief three methods of contraception.

Explain the meaning of sexually transmitted diseases (STDs). Give two examples of STDs each, caused due to (i) bacterial infection and (ii) viral infection. State in brief how the spread of such diseases may be prevented.

Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts : (i) Female germ cell (ii) Male germ cell (iii) Ovary OR Draw a diagram of human female reproductive system and label the part (i) that produces eggs. (ii) where fusion of egg and sperm takes place. (iii) where zygote is implanted. What happens to human egg when it is not fertilised ?

Define the terms pollination and fertilisation. Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following : pollen grain, male gamete, female gamete, ovary. Or Describe in brief the role of (i) testis (ii) seminal vesicle, (iii) vas deferens, (iv) ureter and (v) prostate gland in human male reproductive system.

(i) Explain with the help of a diagram how pollen after landing on the stigma of a flower helps male germ cell to reach the female germ cell. Label the following: ovary, female germ cell, male germ cell and pollen grain. (ii) State the meaning of pollination and mention a distinguishing feature between self-pollination and cross-pollination. OR State in brief the changes that take place in a fertilized egg (zygote) till birth of the child in the human female reproductive system. What happens to the egg when it is not fertilized?

A student has to observe a permanent slide of binary fission in amoeba. Find the correct sequence of steps given below for focussing the object under a microscope. (a) Place the slide on the stage, look through the eye-piece and adjust the mirror to get proper illumination. (b) Focus the slide sharp using fine adjustment screw. (c) Look through the eye-piece and raise the objective lens using coarse adjustment screw till the object is focussed. (d) Look through the eye-piece and move the slide till the object is visible.

Following diagrams were drawn by different students on having seen prepared slides of budding in yeast. Correct diagrams are

After observing a slide, a student draws the following diagrams for different stages of binary fission in Amoeba which are not given in a correct sequence here. The correct sequence of these diagrams should be

After viewing different slides, a student draws following diagrams. Select the one which depicts binary fission in amoeba.

A student draws the following diagram after observing a prepared slide under a microscope. This illustrates

In which of the following figures is budding not shown ?

A prepared slide of budding in yeast was shown to the students of a class. Different students made different sketches on the basis of their memory. Out of these, four diagrams are shown below: The correct diagram(s) is/are

After observing the prepared slides of binary fission in amoeba and budding in yeast following observations were reported : (a) Single cells of amoeba and yeast were undergoing binary fission and budding respectively. (b) Cytokinesis was observed in the yeast cell. (c) Elongated nucleus was dividing to form two daughter nuclei in amoeba. (d) A chain of buds were observed due to reproduction in amoeba. The correct observation(s) is /are :

The following figures illustrate binary fission in Amoeba in an incorrect sequence. The correct sequence is

From the following diagrams, select the correct ones showing stages of binary fission in Amoeba :

A student after viewing a prepared slide illustrates the budding in yeast in the following order which is not correct : (a), (b), (c), (d), (e). The correct order should be :

What is vegetative propagation ? Write two of its advantages.

Write any two differences between binary fission and multiple fission in a tabular form as observed in cells of organisms.

Explain the terms : (i) Implantation of Zygote (ii) Placenta

Explain giving one example of each, the unisexual and the bisexual flowers.

(a) List two sexually transmitted diseases in each of the following cases: (i) Bacterial infections (ii) Viral infections (b) How may the spread of such diseases be prevented?

Expand AIDS. List any four methods of prevention (control) of AIDS.

What does HIV stand for ? Is AIDS an infectious disease ? List any four modes of spreading AIDS.

With the help of suitable diagrams, explain the various steps of budding in Hydra. OR What is binary fission in organisms ? With the help of suitable diagrams, describe the mode of reproduction in Amoeba.

(a) Draw a diagram illustrating fertilization in a flowering plant and label on it : Male germ cell, Ovary, Female germ cell and Pollen grain. (b) Distinguish between self pollination and cross pollination. OR (a) What is spore formation ? (b) Draw a diagram showing spore formation in Rhizopus. (c) List two advantages for organisms to reproduce themselves through spores.

(a) Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma. (b) Write the names of male and female reproductive parts of a flower. OR (a) What is fragmentation in organisms? Name a multicellular organism which reproduces by this method. (b) What is regeneration in organism? Describe regeneration in Planaria with the help of a suitable diagram.

A slide shows a cell and another similar cell of smaller size attached to the tip of the first cell. This slide could be of

A yeast cell in which budding occurs was seen to have:

The shape of yeast cell is

A student was given two permanent slides, one of binary fission in amoeba and other of budding in yeast. He was asked to identify any one difference in the nucleus of the two. One such difference, he identified correctly was:

The steps involved in observing a slide under a microscope are given below. They are not in proper sequence. I. Focus the object under high power of the microscope. II. Place the slide on the stage of the microscope. III. Arrange the mirror to reflect maximum light to the slide. IV. Focus the object under low power of the microscope. The proper sequence of steps is

The process represented in the given diagram is

The given figures illustrate binary fission in Amoeba in improper order. The correct order is

Binary fission is observed in which one of the following figures?

The budding in yeast is illustrated by the following diagram : I, II, III, IV

With the help of diagrams show the different stages of binary fission in Amoeba.

Write the full form of DNA. Name the part of the cell where it is located. Explain its role in the process of reproduction of the cell.