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Q12(a):
Correct the following statements :
(a) Surgical methods of contraception prevent gamete formation.
Solution :
Step 1: Analyzing the Original Statement
The statement "Surgical methods of contraception prevent gamete formation" posits that permanent contraceptive measures (sterilization) act by inhibiting the physiological process of gametogenesis (the production of eggs or sperm). To assess the validity of this statement, we must differentiate between the production of gametes and the transport of gametes.
Step 2: Biological Mechanism of Surgical Contraception
Surgical methods, known as sterilization, include vasectomy in males and tubectomy in females.
- Vasectomy: A small part of the vas deferens is removed or tied up. This blocks the transport of spermatozoa from the testes to the urethra. However, spermatogenesis (production of sperm in the testes) continues normally [Per physiological studies of the seminiferous tubules].
- Tubectomy: A small part of the fallopian tubes is removed or tied up. This blocks the transport of the ovum (secondary oocyte). Oogenesis (production of ova in the ovaries) continues to occur under hormonal regulation [Per the HPO axis - Hypothalamic-Pituitary-Ovarian axis].
Step 3: Correcting the Statement
The error lies in the phrase "prevent gamete formation." The correct terminology is "prevent gamete transport" or "prevent conception by blocking the pathway of gametes."
| Original Statement | Corrected Statement |
|---|---|
| Surgical methods of contraception prevent gamete formation. | Surgical methods of contraception prevent gamete transport. |
Step 4: Theoretical Justification
Sterilization is a terminal method of birth control. It does not alter the endocrine profile of the individual, meaning the secondary sexual characteristics and the hormonal cycles (e.g., the menstrual cycle in females) remain unaffected. The gametes are produced but are reabsorbed by the body or remain sequestered in the proximal section of the reproductive duct, thereby effectively preventing fertilization.
Final Solution: Surgical methods of contraception prevent gamete transport, not gamete formation.
More Questions from Class 12 Biology Reproductive Health EXERCISES
- Q1: What do you think is the significance of reproductive health in a society?
- Q1: What do you think is the significance of reproductive health in a society?
- Q2: Suggest the aspects of reproductive health which need to be given special attention in the present scenario.
- Q2: Suggest the aspects of reproductive health which need to be given special attention in the present scenario.
- Q3: Is sex education necessary in schools? Why?
- Q3: Is sex education necessary in schools? Why?
- Q4: Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
- Q4: Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.
- Q5: What are the suggested reasons for population explosion?
- Q5: What are the suggested reasons for population explosion?
- Q6: Is the use of contraceptives justified? Give reasons.
- Q6: Is the use of contraceptives justified? Give reasons.
- Q7: Removal of gonads cannot be considered as a contraceptive option. Why?
- Q7: Removal of gonads cannot be considered as a contraceptive option. Why?
- Q8: Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
- Q8: Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
- Q9: Suggest some methods to assist infertile couples to have children.
- Q9: Suggest some methods to assist infertile couples to have children.
- Q10: What are the measures one has to take to prevent from contracting STDs?
- Q10: What are the measures one has to take to prevent from contracting STDs?
- Q11(a): State True/False with explanation (a) Abortions could happen spontaneously too. (True/False)
- Q11(a): State True/False with explanation (a) Abortions could happen spontaneously too. (True/False)
- Q11(b): State True/False with explanation (b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
- Q11(b): State True/False with explanation (b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
- Q11(c): State True/False with explanation (c) Complete lactation could help as a natural method of contraception. (True/False)
- Q11(c): State True/False with explanation (c) Complete lactation could help as a natural method of contraception. (True/False)
- Q11(d): State True/False with explanation (d) Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False)
- Q11(d): State True/False with explanation (d) Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False)
- Q12(a): Correct the following statements : (a) Surgical methods of contraception prevent gamete formation.
- Q12(b): Correct the following statements : (b) All sexually transmitted diseases are completely curable.
- Q12(b): Correct the following statements : (b) All sexually transmitted diseases are completely curable.
- Q12(c): Correct the following statements : (c) Oral pills are very popular contraceptives among the rural women.
- Q12(c): Correct the following statements : (c) Oral pills are very popular contraceptives among the rural women.
- Q12(d): Correct the following statements : (d) In E. T. techniques, embryos are always transferred into the uterus.
- Q12(d): Correct the following statements : (d) In E. T. techniques, embryos are always transferred into the uterus.
CBSE Solutions for Class 12 Biology Reproductive Health
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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