Chapter 7

āĻ…āϧ্⧟া⧟ ā§­

Control And Coordination

āύিāϝ়āύ্āϤ্ā§°āĻŖ āφ⧰ু āϏāĻŽāύ্āĻŦāϝ়



 EXERCISES

āĻŦ্⧟া⧟াāĻŽ āϏāĻŽূāĻš

 1. Which of the following is a plant hormone?

ā§§/ āϤāϞ⧰ āĻ•োāύāϟো āωāĻĻ্āĻ­িāĻĻ āĻšā§°āĻŽ’āύ?

 (a) Insulin (āχāύāϚুāϞিāύ)

 (b) Thyroxin  (āĻĨাāχ⧰āĻ•্āϏিāύ)

 (c) Oestrogen   (āχāώ্āϟ্ā§°োāϜেāύ)

 (d) Cytokinin.  (āϚাāχāϟোāĻ•িāύিāύ।)

 Ans-


2. The gap between two neurons is called a

⧍) āĻĻুāϟা āύিāω⧰āύ⧰ āĻŽাāϜ⧰ āĻĢাঁāĻ•āϟোāĻ• āĻ• āĻŦোāϞা āĻšāϝ়

 (a) dendrite. (āĻĄেāĻŖ্āĻĄ্ā§°াāχāϟ।)

 (b) synapse. (āϚিāύেāĻĒ্āϏ।)

 (c) axon. (āĻāĻ•্āϏāύ।) 

 (d) impulse. (āĻ†ā§ąেāĻ—)

 Ans-


3. The brain is responsible for

ā§Š/ āĻŽāĻ—āϜুā§° āĻŦাāĻŦে āĻĻাāϝ়ী

 (a) thinking. (āϚিāύ্āϤা āϕ⧰া।)

 (b) regulating the heart beat. (āĻšৃāĻĻāϏ্āĻĒāύ্āĻĻāύ āύিāϝ়āύ্āϤ্ā§°āĻŖ āϕ⧰া।)

 (c) balancing the body. (āĻļā§°ীā§°ā§° āĻ­াā§°āϏাāĻŽ্āϝ ā§°āĻ•্āώা āϕ⧰া।)

 (d) all of the above. (āĻ“āĻĒā§°ā§° āϏāĻ•āϞোāĻŦোā§°।)

 Ans-


4. What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?

ā§Ē/ āφāĻŽাā§° āĻļā§°ীā§°āϤ āĻĨāĻ•া ā§°িāϚেāĻĒ্āϟ⧰⧰ āĻ•াāĻŽ āĻ•ি? āĻāύে āĻĒā§°িāϏ্āĻĨিāϤিā§° āĻ•āĻĨা āĻ­াāĻŦি āϚাāĻ“āĻ• āϝ’āϤ ā§°িāϚেāĻĒ্āϟ⧰āĻŦোā§°ে āϏāĻ িāĻ•āĻ­াā§ąে āĻ•াāĻŽ āύāϕ⧰ে। āĻ•ি āĻ•ি āϏāĻŽāϏ্āϝাā§° āϏৃāώ্āϟি āĻšোā§ąাā§° āϏāĻŽ্āĻ­াā§ąāύা āφāĻ›ে?

 Ans-


5. Draw the structure of a neuron and explain its function.

ā§Ģ) āύিāω⧰āύ⧰ āĻ—āĻ āύ āφঁāĻ•ি āϤাā§° āĻ•াā§°্āϝ্āϝ āĻŦ্āϝাāĻ–্āϝা āϕ⧰া।

 Ans-


6. How does phototropism occur in plants?

ā§Ŧ. āωāĻĻ্āĻ­িāĻĻāϤ āĻĢāϟোāϟ্ā§°āĻĒিāϜāĻŽ āĻ•েāύেāĻĻā§°ে āĻšāϝ়?

 Ans-


7. Which signals will get disrupted in case of a spinal cord injury?

ā§­/ āĻŽেā§°ুāĻĻāĻŖ্āĻĄā§° āφāϘাāϤ⧰ āĻ•্āώেāϤ্ā§°āϤ āĻ•োāύāĻŦোā§° āϏংāĻ•েāϤāϤ āĻŦ্āϝাāϘাāϤ āϜāύ্āĻŽিāĻŦ?

 Ans-


8. How does chemical coordination occur in plants?

ā§Ž) āωāĻĻ্āĻ­িāĻĻāϤ ā§°াāϏাāϝ়āύিāĻ• āϏāĻŽāύ্āĻŦāϝ় āĻ•েāύেāĻ•ৈ āĻšāϝ়?

 Ans-


9. What is the need for a system of control and coordination in an organism?

⧝) āĻāϟা āϜীā§ąāϤ āύিāϝ়āύ্āϤ্ā§°āĻŖ āφ⧰ু āϏāĻŽāύ্āĻŦāϝ়ā§° āĻŦ্āĻ¯ā§ąāϏ্āĻĨাā§° āĻĒ্ā§°āϝ়োāϜāύ āĻ•ি?

 Ans-


10. How are involuntary actions and reflex actions different from each other?

ā§§ā§Ļ) āĻ…āύাāĻ•াংāĻ•্āώিāϤ āĻ•াā§°্āϝ্āϝ āφ⧰ু āĻĒ্ā§°āϤিāĻĢāϞāύ āĻ•াā§°্āϝ্āϝ āχāϟোā§ąে āϏিāϟোā§° āĻĒā§°া āĻ•েāύেāĻ•ৈ āĻĒৃāĻĨāĻ•?

 Ans-


11. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.

ā§§ā§§) āϜীā§ą-āϜāύ্āϤুā§° āύিāϝ়āύ্āϤ্ā§°āĻŖ āφ⧰ু āϏāĻŽāύ্āĻŦāϝ়ā§° āĻŦাāĻŦে āϏ্āύাāϝ়ু āφ⧰ু āĻšā§°āĻŽ’āύ āĻŦ্āĻ¯ā§ąāϏ্āĻĨাā§° āϤুāϞāύা āφ⧰ু āĻŦিāĻĒā§°ীāϤāĻŽুāĻ–ীāϤা āϕ⧰া।

 Ans-


12. What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?

⧧⧍) āϏংāĻŦেāĻĻāύāĻļীāϞ āωāĻĻ্āĻ­িāĻĻāϤ āϝি āϧ⧰āĻŖā§° āĻ—āϤিāĻŦিāϧি āĻšāϝ় āφ⧰ু āφāĻŽাā§° āĻ­ā§°িā§° āĻ—āϤিāĻŦিāϧিā§° āĻŽাāϜāϤ āĻĒাā§°্āĻĨāĻ•্āϝ āĻ•ি?

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