Q5
2 marksShort AnswerSection SECTION A

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

How do Organisms Reproduce?
Reproductive Health
Official Answer

Two contraceptive methods used to control the size of the human population are:


  1. 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.

  1. 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.
Barrier methodscondomsChemical methodsoral pillshormonal balanceprevent ovulationfertilisation

Marking Scheme

  • 1Identification and explanation of the first method (e.g., Barrier method): 1 Mark
  • 2Identification 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.

Analysis & 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.

Common Mistakes

  1. 1Confusing chemical methods with barrier methods regarding STI protection (only barrier methods like condoms protect against STIs).
  2. 2Forgetting to explain *how* the method prevents pregnancy after naming it.

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.

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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.