HOW DO ORGANISMS REPRODUCE– 3 Mark Questions

Q1.  Explain the term ‘Regeneration’ as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra?

Q2.   List any three advantages of vegetative propagation.

Q3.  What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants.

Q4.   What is placenta?  Describe its structure. State its functions in case of pregnant human female.

Q5.   Give two ‘reasons for the appearance of variations among the progeny formed by sexual reproduction.

Q6. Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement.

Q7. What is vegetative propagation? When is it used? List its two uses.

Q8. Define reproduction. How does it help in providing stability to the population of species?

Q9. What is regeneration?  Give one example of an organism that shows this process and one organism that does not.  Why does regeneration not occur in the latter? 

Q10. What happens when:

(a) Accidently, Planaria gets cut into many pieces?

(b) Bryophyllum leaf falls on the wet soil?

(c) On maturation sporangia of Rhizopus bursts?

Q11. (i)   Differentiate between binary and multiple fission. Name an organism that reproduces by multiple fission.

            (ii) Vegetative propagation is beneficial to plants that are propagated asexually. Give two advantages.

Q12. (i) With the help of a diagram demonstrate the process of regeneration as seen in Planaria.

           (ii) Which type of cells are used by such multi-cellular organisms to regenerate?

Q13. Describe reproduction by spores in Rhizopus.

Q14. What is asexual reproduction? Write the process of budding in Hydra.

Q15. Why is DNA copying an essential part of the process of reproduction? What are the advantages of sexual reproduction over asexual reproduction?

Q16. Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival-the one reproducing asexually or the one reproducing sexually? Justify your answer.

Q17. How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.

Q18. Mention the important post-fertilization changes in the flower.

Q19. What is sexual reproduction?  List its four significance.

 Q20. Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label.

Q21. State the basic requirement for sexual reproduction? Write the importance of such reproductions in nature.

Q22. List any four steps involved in sexual reproduction and write its two advantages.

Q23. Reproduction is one of the most important characteristics of living beings. Give three reasons in support of the statement.

Q24. What is placenta? Write any two major functions of placenta.

Q25. State the changes that take place in the uterus when:

(i) Implantation of embryo has occurred.

(ii) Female gamete/egg is not fertilised.

Q26. Write the functions of the following parts of human female reproductive system:

(i) Ovary, (ii) Fallopian, (iii) Uterus.

Q27. State briefly the changes that take place in a fertilized egg till birth of the child in the human female reproductive system. What happens to the egg when it is not fertilized?

Q28. DNA content has the tendency to double itself during sexual reproduction due to combining of the genetic materials from two parents. How can the problem of DNA doubling be solved to maintain the consistency of the genetic material throughout the species?

Q29. List four points of significance of reproductive health in a society. Name any two areas related to reproductive health which have improved over the past 50 years in our country.

Q30. (i)  Mention two secondary sexual characters in human male.

           (ii) Write the dual purpose served by urethra males?

Q31. List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?

Q32. What is contraception? Name any two methods. How does the use of these methods have a direct effect on the health and prosperity of a family? State any three points.

Q33. State one function of each of the following parts of human male reproductive system.

(i) Vas deferens, (ii) Testes, (iii) Prostate gland.

Q34.  (i) Explain, what are unisexual and bisexual organisms, giving an example for each.

          (ii) What type of pollination would occur by insects?

Q35.       What is implantation? Where does it take place?  Mention the structure involved and its function.

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