Study Materials

NCERT Solutions for Class 10th Science

 

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Chapter 8. How do Organisms Reproduce

Exercise

 

 

 

Exercises:


Q1. Asexual reproduction takes place through budding in
(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.

Answer: (b) yeast

Q2. Which of the following is not a part of the female reproductive system in human beings?
(a) Ovary
(b) Uterus
(c) Vas deferens
(d) Fallopian tube

Answer: (c) Vas deferens 

Q3. The anther contains
(a) sepals.
(b) ovules.
(c) carpel.
(d) pollen grains.

Answer: (d) pollen grains. 

Q4. What are the advantages of sexual reproduction over asexual reproduction?

Answer: The advantages of sexual reproduction over asexual reproduction are as follows: 

(i) There are much variations in the organisms reproduced by sexual reproduction than of the asexual reproduction. 

(ii) It plays an important role in speciation. 

(iii) There are much options to combine of new variations of DNA. 

(iv) The new indivisual is differ to parent in physically but similar at DNA level. 

(v) The sexual reproduction encourrages much new features in offspring as it occurs by fission of two difference gamates while there is no so happens in asexual reproduction.   

Q5. What are the functions performed by the testis in human beings?

Answer: Function of testis in human beings:

(i) It produces male gamate sperms. 

(ii) It releases male sex hormone testosterone. 

Q6. Why does menstruation occur?

Answer: A girl with puberty performs menstruation when an egg does not fertilise. After releasing ovum(egg) comes in fallopian tube and if here it comes in the contact of male gamate sperm the fertilisation takes place but if fertilisation does not take place it comes down in the uterus and after 3 to 4 days it gets degenerated and mixed with blood and mucus comes out of uterus. This is called menstruation and it occurs after every 28 days.    

Q7. Draw a labelled diagram of the longitudinal section of a flower.

Answer: 

Q8. What are the different methods of contraception?

Answer: There are following contraception methods: 

(i) 

Q9. How are the modes for reproduction different in unicellular and
multicellular organisms?
Q10. How does reproduction help in providing stability to populations of species?
Q11. What could be the reasons for adopting contraceptive methods?

 

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