Suggest any two contraceptive methods to control the size of human population and explain them.
Suggest any two contraceptive methods to control the size of human population and explain them.
Official answer
Two contraceptive methods used to control the size of the human population are:
- Barrier Methods:
- Explanation: These methods involve physical barriers that prevent the sperm from meeting the egg. For example, the use of condoms (for males) or diaphragms (for females) physically blocks the passage of semen into the female reproductive tract during coitus, thereby preventing fertilisation.
- Chemical or Hormonal Methods:
- Explanation: These methods involve the consumption of oral contraceptive pills or the use of hormonal patches by females. These preparations change the hormonal balance of the body so that eggs are not released (ovulation is prevented) from the ovaries, making fertilisation impossible.
Marking scheme
- 1.Identification and explanation of the first method (e.g., Barrier method): 1 Mark
- 2.Identification and explanation of the second method (e.g., Chemical/Hormonal method): 1 Mark
Hint
Think of one physical barrier that blocks sperm from reaching the egg, and one chemical method that alters hormones to prevent egg release.
Quick oral answer
Two contraceptive methods are barrier methods, like condoms, which physically block sperm from reaching the egg, and chemical methods, like oral pills, which change hormonal levels to prevent the release of eggs.
Common mistakes
- 1.Confusing chemical methods with barrier methods regarding STI protection (only barrier methods like condoms protect against STIs).
- 2.Forgetting to explain *how* the method prevents pregnancy after naming it.
Analysis and explanation
Contraceptive methods are essential tools for family planning and population control. They work by preventing fertilisation or implantation through various mechanisms:
- Barrier methods (like condoms) physically block gamete fusion and additionally offer protection against sexually transmitted infections (STIs).
- Hormonal methods (like oral pills) alter the endocrine system to suppress ovulation.
- Intrauterine Devices (IUCDs) (like copper-T) prevent implantation in the uterus.
- Surgical methods (like vasectomy and tubectomy) block gamete transport permanently.
Interesting facts
The first oral contraceptive pill was approved in the 1960s and is widely considered one of the most significant social and scientific developments of the 20th century, transforming global demographics and women's health.
Question details
Q5 of 20 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2022
- Section
- Section SECTION A
- Marks
- 2
- Type
- Short Answer
- Chapter
- How do Organisms Reproduce?
- Topic
- Reproductive Health
- Bloom's level
- Understanding
- Syllabus topic
- Reproductive health - need and methods of family planning. Safe sex vs HIV/AIDS. Child bearing and women's health.
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2022?
This question carries 2 marks in the CBSE Class 10 Science 2022 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 "Reproductive Health" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2022 paper?
This is a Short Answer question from Section SECTION A in the CBSE Class 10 Science 2022 paper.