Chapter 8

āĻ…āϧ্āϝাāϝ় ā§Ž

 How do Organisms Reproduce?

āϜীā§ąāĻŦোā§°ে āĻ•েāύেāĻ•ৈ āĻŦংāĻļāĻŦৃāĻĻ্āϧি āϕ⧰ে?

EXERCISES

āĻŦ্⧟া⧟াāĻŽ āϏāĻŽূāĻš

 1. Asexual reproduction takes place through budding in

 1. āωāĻĻীāϝ়āĻŽাāύ ā§° āϜ⧰িāϝ়āϤে āĻ…āϝৌāύ āĻĒ্ā§°āϜāύāύ āĻšāϝ়

 (a) amoeba. (āĻāĻŽিāĻŦা।)

 (b) yeast.  (āĻ•িāĻŖ্āĻŦ.)

 (c) plasmodium.  (āĻĒ্āϞাāϜāĻŽোāĻĄিāϝ়াāĻŽ)

 d) leishmania.  (āϞিāϚāĻŽেāύিāϝ়া)

 Ans-


2. Which of the following is not a part of the female reproductive system in human beings?

⧍) āϤāϞ⧰ āĻ•োāύāϟো āĻŽাāύুāĻšā§° āύাā§°ী āĻĒ্ā§°āϜāύāύ āϤāύ্āϤ্ā§°ā§° āĻ…ংāĻļ āύāĻšāϝ়?

 (a) Ovary  (āĻĄিāĻŽ্āĻŦাāĻļāϝ়)

 (b) Uterus  (āϜ⧰াāϝ়ু)

 (c) Vas deferens  (āĻ­াāϚ āĻĄিāĻĢাā§°েāύ)

 (d) Fallopian tube  (āĻĢেāϞোāĻĒিāϝ়াāύ āϟিāωāĻŦ)

 Ans-


3. The anther contains

3. āĻāύ্āĻĨাā§°āϤ āĻĨাāĻ•ে

 (a) sepals. (āĻĢুāϞ⧰ āĻ—ুāϟি।)

 (b) ovules.  (āĻĄিāĻŽ্āĻŦাāĻŖু।)

 (c) pistil.  ( āĻĒিāώ্āϟিāϞ।)

 (d) pollen grains. (āĻĒā§°েāĻ— āĻĻাāύা।)

 Ans-


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

ā§Ē/ āĻ…āϝৌāύ āĻĒ্ā§°āϜāύāύāϤāĻ•ৈ āϝৌāύ āĻĒ্ā§°āϜāύāύ⧰ āϏুāĻŦিāϧা āĻ•ি āĻ•ি?

 Ans-


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

ā§Ģ/ āĻŽাāύুāĻšā§° āĻ…āĻŖ্āĻĄāĻ•োāώে āĻ•ি āĻ•ি āĻ•াāĻŽ āϕ⧰ে?

 Ans-


6. Why does menstruation occur?

ā§Ŧ/ āĻ‹āϤুāϏ্ā§°াā§ą āĻ•িāϝ় āĻšāϝ় ?

 Ans-


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

ā§­) āĻĢুāϞ āĻāϟাā§° āĻĻীā§°্āϘাāϝ়িāϤ āĻ…ংāĻļā§° āϞেāĻŦেāϞāϝুāĻ•্āϤ āĻĄাāϝ়েāĻ—্ā§°াāĻŽ āφঁāĻ•িāĻŦ।

 Ans-


8. What are the different methods of contraception?

ā§Ž) āĻ—ā§°্āĻ­āύিā§°োāϧ⧰ āĻŦিāĻ­িāύ্āύ āĻĒāĻĻ্āϧāϤি āĻ•ি āĻ•ি?

 Ans-


9. How are the modes for reproduction different in unicellular and multicellular organisms?

⧝) āĻāĻ•āĻ•োāώী āφ⧰ু āĻŦāĻšুāĻ•োāώী āϜীā§ąāϤ āĻĒ্ā§°āϜāύāύ⧰ āϧ⧰āĻŖ āĻ•েāύেāĻ•ৈ āĻŦেāϞেāĻ— āĻŦেāϞেāĻ—?

 Ans-


10. How does reproduction help in providing stability to populations of species?

ā§§ā§Ļ) āĻĒ্ā§°āϜাāϤিā§° āϜāύāϏংāĻ–্āϝাāĻ• āϏ্āĻĨিāϤিāĻļীāϞāϤা āĻĒ্ā§°āĻĻাāύ āϕ⧰াāϤ āĻĒ্ā§°āϜāύāύে āĻ•েāύেāĻĻā§°ে āϏāĻšাāϝ় āϕ⧰ে?

Ans-


 11. What could be the reasons for adopting contraceptive methods?

ā§§ā§§) āĻ—ā§°্āĻ­āύিā§°োāϧāĻ• āĻĒāĻĻ্āϧāϤি āĻ—্ā§°āĻšāĻŖ āϕ⧰াā§° āĻ•াā§°āĻŖ āĻ•ি āĻš’āĻŦ āĻĒাā§°ে?

 Ans-