NCERT Solutions for Class 12 Biology Chapter 4

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NCERT Solutions for class 12 Biology Chapter 4

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Solutions for 12 Biology Chapter 4

Class 12 Biology Chapter 4 Question Answers

NCERT Solutions for Class 12 Biology Chapter 4 Reproductive Health
NCERT Solutions for Class 12 Biology Chapter 4 in PDF form

NCERT Solutions for Class 12 Biology Chapter 4 in english medium
12 Biology chapter 4 solutions

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Important terms on Chapter 4
Methods of Birth Control
  • Natural Methods: Periodic abstinence, Coitus interruptus or withdrawal Lactational amenorrhea.
  • Barrier Methods: Condom, Diaphragms, Cervical cap and vault
  • Intra Uterine Devices: Non¬ómedicated (e.g. Lippes loop), Copper releasing (e.g., Cu-T, multiload 375), Hormone releasing (e.g. LNG-20, progestasert)
  • Oral contraceptives: Pills / Saheli, Mala-D Small doses of either progestogens or Progestogen-estrogen combination
  • Injections: Progestrone derivates given every three months.
  • Implants: Synthetic progestrone patches are implanted under the skin. Prevents pregnancy upto 4 years.
  • Emergency pills: Must be taken within 72 hours of coitus. They have high concentration of progestrone and oestrogen which prevent ovulation, e.g. I pill, unwanted-72 etc.
  • Surgical (Sterilisation): (1) Tubectomy; (2) Vasectomy in male in females.

Important Questions
  1. Give the term for prenatal diagnostic technique aimed to know the sex of developing foetus and to detect congenital disorders.
  2. After a successful in-vitro fertilisation, the fertilised egg begins to divide. Where is this egg transferred before it reaches the 8-celled stage and what is this technique called?
  3. Give the term for rapid population growth.
  4. Name the Fluid from which foetal cells are extracted for chromosomal analysis.
  5. Give another name for sexually transmitted diseases. Name two sexually transmitted diseases which are curable and two diseases which are not curable.
  6. Mention the various precautions one has to take in order to protect himself/ herself form STDs.

  1. Amniocentesis.
  2. Fallopian tube; Zygote intra fallopian transfer (ZIFT)
  3. Population explosion.
  4. Amniotic fluid.
  5. Veneral disease (VD)/Reproductive tract infection (RTI), Curable-Syphilis, Gonorrhoea, Non Curable-Hepatitis B, AIDS.
  6. (i) Avoid blood transfusion from an infected person.
    (ii) Avoid sex with an unknown partner and multiple partners.
    (iii) Always use condom.
    (iv) Avoid sharing of injections needles and syringes and surgical instruments.