Question 255 marksLong AnswerSection A

(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.

How do Organisms Reproduce?
Sexual Reproduction in Flowering Plants and Spore Formation

Official answer

(a) Fertilization in flowering plants involves the transfer of pollen to the stigma, followed by the growth of a pollen tube to reach the female germ cell in the ovary.


(b) Distinction between self-pollination and cross-pollination:

  1. Self-pollination: The transfer of pollen grains from the stamen to the stigma of the same flower.
  2. Cross-pollination: The transfer of pollen grains from the stamen of one flower to the stigma of another flower of the same or different plant of the same species, often mediated by agents like wind, water, or animals.

OR


(a) Spore formation is an asexual mode of reproduction where specialized reproductive structures called sporangia produce tiny, unicellular bodies called spores. These spores are capable of developing into new individuals under favorable conditions.

(b) Diagram of Spore Formation in Rhizopus (see below).

(c) Two advantages of reproducing through spores:

  1. Protection: Spores are covered by thick walls that protect them from unfavorable environmental conditions until they come into contact with a moist surface.
  2. Survival: It allows the organism to survive in a dormant state until conditions become suitable for growth.
Answer keywords:Pollen tubeOvaryZygoteStigmaSporangiaThick wallsMoist surface

Marking scheme

  1. 1.Diagram of fertilization with 4 correct labels (3 marks)
  2. 2.Distinction between self and cross pollination (2 marks)
  3. 3.OR: Definition of spore formation (1 mark)
  4. 4.OR: Diagram of Rhizopus with labels (2 marks)
  5. 5.OR: Two advantages of spores (2 marks)

Hint

Recall the parts of the pistil (stigma, style, ovary) and the protective nature of the spore wall mentioned in the text.

Quick oral answer

The male germ cell reaches the ovary by traveling through a pollen tube that grows out of the pollen grain and down the style.

Common mistakes

  1. 1.Confusing the location of the male germ cell (it is in the pollen tube, not just the grain).
  2. 2.Forgetting that cross-pollination requires external agents.

Analysis and explanation

In flowering plants, the stamen (male part) produces pollen, and the pistil (female part) contains the ovary. Fertilization occurs when the male germ cell from the pollen tube fuses with the egg cell (female germ cell) inside the ovule. Pollination is the prerequisite for this.


In spore formation (e.g., Rhizopus), the organism produces thousands of spores. This is advantageous because spores are lightweight and protected by a tough outer layer, ensuring the survival of the species even in harsh conditions. Unlike complex multicellular organisms that require specialized tissues for reproduction, simple organisms like Rhizopus use these blobs-on-a-stick (sporangia) to propagate rapidly.

Interesting facts

Some plants like Bryophyllum can reproduce through leaves, which is a form of vegetative propagation, but Rhizopus specifically uses spores for rapid dispersal.

Question details

Q25 of 41 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2011
Section
Section A
Marks
5
Type
Long Answer
Chapter
How do Organisms Reproduce?
Topic
Sexual Reproduction in Flowering Plants and Spore Formation
Bloom's level
Apply
Syllabus topic
Reproduction in plants: asexual and sexual; reproductive health

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2011?

This question carries 5 marks in the CBSE Class 10 Science 2011 examination.

Which chapter does this question come from in Science?

This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Sexual Reproduction in Flowering Plants and Spore Formation" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2011 paper?

This is a Long Answer question from Section A in the CBSE Class 10 Science 2011 paper.