HOW DO ORGANISMS REPRODUCE– 2020 Important Questions


Q1.  What happens when Planaria gets cut into two pieces?

Q2.  Why are testis located outside the abdominal cavity?

Q3.  In which part of the female reproductive tract does the egg gets fertilised?

Q4.  What is the function of the umbilical cord?

Q5.  How hormonal methods of contraception act?

Q5. Name the type of reproduction mostly seen in unicellular organisms.

Q6. Name the plant that reproduces vegetatively by leaf.

Q7. When a cell reproduces, what happens to its DNA?

Q8. Name the method by which Hydra reproduces. Is this method sexual or asexual?

Q9. State the method used for growing rose plants and jasmine plants.

Q10. “Cell division is a type of reproduction in unicellular organism”. Justify.

Q11. List two functions of ovary of human female reproductive system.

Q12. Name the organs producing sperms and ova respectively in humans.

Q13. Give reason for the statement-‘Since the ovary releases one egg every month, the uterus also prepares itself every month by making its lining thick and spongy’.

Q14. No two individuals are absolutely alike in a population. Why?

Q15. How do we know that two different individuals belong to the same species?

Q16. In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.

Q17.       Name the individual units of floral whorls.

Q18.       Delivery of sperms from where they are produced to urethra is facilitated by which part?

Directions (Q. Nos. 19 – 23) In the following questions, a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q19. Assertion: The uterus prepares itself every month to receive a fertilised egg.

            Reason: The ovary releases one egg every month.

Q20. Assertion: Ureter forms the common passage for both the sperms and urine.

            Reason: It never carries both of them at the same time.

Q21. Assertion: Zygote is form by fusion of sperm with Egg.

            Reason: Both the sperm and the egg are haploid.

Q22. Assertion: Pollination is the transfer of pollen grain to the anther.

            Reason: Pollination is carried out by wind, birds and insects.

Q23. Assertion: Contraception is used to avoid unnecessary pregnancies.

            Reason: Contraception is used by both males and females.

Q24.  Callus is defined as

(a) an insoluble carbohydrate

(b) tissue which forms embryo

(c) tissue which grows to form embryoid

 (d) an unorganised actively dividing mass of cells maintained in a culture

Q25.  What is the role of secretions of seminal vesicles and prostate glands?

(a) Provides transport medium only

(b) Provides nutrition only

(c) Provides maturation of ovary

(d) Both (a) and (b)

Q26. Identify the disease which is caused by a virus.

(a) Syphilis                        

(b) Genital warts

(c) Gonorrhoea                     

(d) Both (a) and (c)

Q27.  What would be the major effects of removing ovary on female reproductive system?

(a) Production of egg will stop forever

(b) Hormones will produce in large amount

(c) Entry of male gametes into oviduct will halt

(d) All of the above


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.


Q1.  Reproduction is essentially a phenomenon that is not for the survival of an individual, but for the stability of a species. Justify.           

Q2. Differentiate between the following:

(i)  Pollen tube and style

(ii)   Fission in Amoeba and Plasmodium

(iii) Fragmentation and regeneration

(iv)  Bud of Hydra and Bryophyllum

(v)  Vegetative propagation and spore formation.

Q3.  Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the female.

Q4. Describe the menstrual cycle.

Q5. Differentiate between the following:

(i) Pollen tube and style

(ii) Fission in Amoeba and Plasmodium

(iii) Fragmentation and regeneration

(iv) Bud of Hydra and bud of Bryophyllum

(v) Vegetative propagation and Spore formation

Q6. (a) What is variation? How is variation created in a population? How does the creation of variation in a species promote survival?

         (b) Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.

Q7. (a) What is pollination? Give its two types.

         (b) Draw a longitudinal section of female reproductive part of a flower showing germination of pollen grain. Label on it the following:

(i) Stigma;

(ii) Pollen tube with a male germ cell;

(iii) Female germ cell.

Q8. (a) Name the parts labelled as A, B, C and D in the diagram given below:

         (b) What is pollination? State its significance.

         (c) How does fertilization occur in flowers?

Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilization.

Q9.  What is pollination? How does it occur in plants? How does pollination lead to fertilization? Explain.

Q10. (a) Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.

           (b) Name the parts of the human female reproductive system where:

(i) Fertilization takes place

(ii) Implantation of the fertilised egg occurs.

           (c) Explain how the embryo gets nourishment inside the mother’s body.

Q11. (a)  Name   the respective part   of human female reproductive system:

(i) that produces eggs,

(ii) where fusion of eggs and sperm takes place, and

(iii) where zygote gets implanted.

         (b) Describe in brief what happens to the zygote after it gets implanted.

Q12. (i) Name a sexually transmitted disease and a method to avoid it.

(ii) Drawn a neat diagram of human male reproductive system and label the parts performing the following functions:

(a)   Production of sperms,   

(b)   Gland which provide fluid,  

(c) Provides   low temperature (or the formation of sperms)

(d) Common passage for sperm and urine.

Q13.  Draw a longitudinal section of a flower and label the following parts.

(a) Part that produces pollen grain.

(b) Part that transfers male gamete to the female gamete.

(c) Part that is sticky to trap the pollen grain.

(d) Part that develops into a fruit.

(e) Part that is female reproductive structure.

Q14. (a) List two advantages of growing grapes or banana plants through vegetative propagation.

           (b) List the parts of human male reproductive system which contribute fluid to the semen. State two advantages semen offer to the sperms.

          (c) Why is it said that sexual reproduction promotes diversity of characters in the offsprings?

Q15.       What is the function of anther? How does fusion of male and female gametes take place in plants?

Q16.       Explain tissue culture technique. In which area this technique is finding its application?

Q17.      (i)  Give the possibilities for a flower to reproduce by self-pollination.

                (ii) What events take place in a flower after fertilisation has taken place?


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