CBSE Important Questions(Long questions) for HOW DO ORGANISMS REPRODUCE

Q1. In what respect is the human male gamete different from the female gamete?
Q2. What are the advantages of sexual reproduction over asexual reproduction?
Q3. How does the embryo get nourishment inside the mother’s body?
Q4. How does reproduction help in providing stability to populations of species?
Q5. What changes are observed in the uterus if fertilization does not occur?
Q6. What is added to the sperm along the path of vas deferens ? Describe in brief?
Q7. Ina bisexual flower, inspite of young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation?
Q8. Explain how is the DNA content maintained during the process of reproduction?
Q9. What is meant by menstruation? Why does it take place? How long does this process last?
Q10. What will happen when testosterone is released in the male reproductive system?
Q11. (a) Explain the term:-
(i) Implantation
(ii) Placenta
(b) What is the average duration of human pregnancy?
Q12. Explain vegetative propagation with the help of two examples? List two advantages of vegetative propagation?
Q13. What is meant by the term puberty? Give an example of the changes seen during puberty?
Q14. What are chromosomes? Explain how is sexually reproducing organisms the number of chromosomes in the pregnancy is maintained?
Q15. Distinguish between a gamete and a zygote? Explain their role I sexual reproduction?
Q16. How will an organism be benefited if it reproduces through spores?
Q17. What is the importance of DNA copying in reproduction?
Q18. Which species is likely to have better chance of survival – the one reproducing asexually or the one reproducing sexually? Justify your answer.
Q19. Why is variation beneficial to the species but not necessarily for the individual?
Q20. Explain the process of regeneration in Planaria? How is his process different from reproduction?
Q21. What is AIDS? Which microbe is responsible for AIDS infection? State one mode of transmission of this disease. Explain in brief one measure for the prevention of AIDS.

Q22. (a) Draw a diagram of human female reproductive system and label the part –
(i) that produce egg
(ii) where fusion of egg and sperm takes place.
(iii) where zygote is implanted
(b) What happen to human egg when it is not fertilized?
Q23. Answer the following:-
(i) Name any four asexual mode of reproduction?
(ii) Explain with diagram the method by which an Amoeba reproduces?
(iii) How is fission different from fragmentation?
Q24. What are the different methods of contraception?
Q25. (a) Write the name of those parts of a flower which serve the same function as the following do in animals –
(i) Testes
(ii) Sperm
(iii) Ovary
(iv) Egg
(b) State the function of flower in the flowering part?
(c) Draw a labeled diagram of flower?


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