Chapter - 15
Our Environment
( āĻāĻŽাā§° āĻĒā§°িā§ąেāĻļ )
EXERCISES:-
( āĻŦ্āϝাāϝ়াāĻŽ:- )
1. Which of the following groups contain only biodegradable items?
( āύিāĻŽ্āύāϞিāĻিāϤ āĻোāύāĻো āĻোāĻāϤ āĻেā§ąāϞ āĻৈā§ą-āĻĒāĻāύāĻļীāϞ āϏাāĻŽāĻ্ā§°ী āĻĨাāĻে? )
(a) Grass, flowers and leather
( āĻাঁāĻš, āĻĢুāϞ āĻā§°ু āĻাāĻŽā§°া )
(b) Grass, wood and plastic
( āĻাঁāĻš, āĻাāĻ āĻā§°ু āĻĒ্āϞাāώ্āĻিāĻ )
(c) Fruit-peels, cake and lime-juice
( āĻĢāϞ⧰ āĻŦাāĻāϞি, āĻেāĻ āĻā§°ু āĻূāĻŖā§° ā§°āϏ )
(d) Cake, wood and grass
( āĻেāĻ, āĻাāĻ āĻā§°ু āĻাঁāĻš )
Answer:-
2. Which of the following constitute a food-chain?
( āύিāĻŽ্āύāϞিāĻিāϤ āĻোāύāĻোā§ąে āĻাāĻĻ্āϝ-āĻļৃংāĻāϞা āĻāĻ āύ āĻā§°ে? )
(a) Grass, wheat and mango
( āĻাঁāĻš, āĻেঁāĻšু āĻā§°ু āĻāĻŽ )
(b) Grass, goat and human
( āĻাঁāĻš, āĻাāĻāϞী āĻā§°ু āĻŽাāύুāĻš )
(c) Goat, cow and elephant
( āĻাāĻāϞী, āĻā§°ু āĻā§°ু āĻšাāϤ )
(d) Grass, fish and goat
( āĻাঁāĻš, āĻŽাāĻ āĻā§°ু āĻাāĻāϞী )
Answer:-
3. Which of the following are environment-friendly practices?
( āύিāĻŽ্āύāϞিāĻিāϤ āĻোāύāĻো āĻĒā§°িā§ąেāĻļ-āĻ āύুāĻূāϞ āĻ āĻ্āϝাāϏ? )
(a) Carrying cloth-bags to put purchases in while shopping
( āĻŦāĻাā§° āĻā§°োঁāϤে āĻ্ā§°āϝ় āĻā§°িāĻŦāϞৈ āĻাāĻĒোā§°ā§° āĻŽোāύা āĻāĻĸ়িāϝ়াāĻ āύিāϝ়া )
(b) Switching off unnecessary lights and fans
( āĻ āĻĒ্ā§°āϝ়োāĻāύীāϝ় āϞাāĻāĻ āĻā§°ু āĻĢেāύ āĻŦāύ্āϧ āĻā§°া )
(c) Walking to school instead of getting your mother to drop you on her scooter
( āĻāĻĒোāύাā§° āĻŽাāĻāĻ āϤাāĻā§° āϏ্āĻুāĻাā§°āϤ āĻĒেāϞাāĻ āĻĻিāϝ়াā§° āϏāϞāύি āϏ্āĻুāϞāϞৈ āĻোāĻ āĻāĻĸ়া )
(d) All of the above
( āĻāĻĒā§°োāĻ্āϤ āϏāĻāϞোāĻŦোā§° )
Answer:-
4. What will happen if we kill all the organisms in one trophic level?
( āϝāĻĻি āĻāĻŽি āϏāĻāϞো āĻীā§ąāĻ āĻāĻা āĻ্ā§°āĻĢিāĻ āϏ্āϤ⧰āϤ āĻšāϤ্āϝা āĻā§°োঁ āϤেāύ্āϤে āĻি āĻš'āĻŦ? )
Answer:-
5. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
( āĻŦিāĻিāύ্āύ āĻ্ā§°āĻĢিāĻ āϏ্āϤ⧰⧰ āĻŦাāĻŦে āϏāĻāϞো āĻীā§ąāĻ āĻ্ā§°āĻĢিāĻ āϏ্āϤ⧰āϤ āĻঁāϤ⧰ āĻā§°াā§° āĻĒ্ā§°āĻাā§ą āĻĒৃāĻĨāĻ āĻš'āĻŦāύে? āĻোāύো āĻ্ā§°āĻĢিāĻ āϏ্āϤ⧰⧰ āĻীā§ąāĻŦোā§° āĻĒā§°িā§ąেāĻļ āϤāύ্āϤ্ā§°ā§° āĻোāύো āĻ্āώāϤি āύāĻā§°াāĻৈ āĻঁāϤ⧰ āĻā§°িāĻŦ āĻĒাā§°িāύে? )
Answer:-
6. What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
( āĻৈā§ąিāĻ āĻŦিāĻŦā§°্āϧāύ āĻি? āĻĒā§°িā§ąেāĻļ āϤāύ্āϤ্ā§°ā§° āĻŦিāĻিāύ্āύ āϏ্āϤ⧰āϤ āĻāĻ āĻŦিāĻŦā§°্āϧāύ⧰ āϏ্āϤ⧰ āĻĒৃāĻĨāĻ āĻš'āĻŦāύে? )
Answer:-
7. What are the problems caused by the non-biodegradable wastes that we generate?
( āĻāĻŽি āϏৃāώ্āĻি āĻā§°া āĻ -āĻৈā§ą-āĻĒāĻāύāĻļীāϞ āĻā§ąā§°্āĻāύাā§° āĻĢāϞāϤ āĻি āĻি āϏāĻŽāϏ্āϝা āĻšāϝ়? )
Answer:-
8. If all the waste we generate is biodegradable, will this have no impact on the environment?
( āϝāĻĻি āĻāĻŽি āĻā§āĻĒāύ্āύ āĻā§°া āϏāĻāϞো āĻā§ąā§°্āĻāύা āĻৈā§ą-āĻĒāĻāύāĻļীāϞ āĻšāϝ়, āĻāϝ়াā§° āĻĒā§°িā§ąেāĻļā§° āĻāĻĒā§°āϤ āĻোāύো āĻĒ্ā§°āĻাā§ą āύāĻĒā§°ে āύেāĻি? )
Answer:-
9. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
( āĻāĻোāύ āϏ্āϤ⧰⧰ āĻ্āώāϤি āĻিāϝ় āĻিāύ্āϤাā§° āĻাā§°āĻŖ? āĻāĻ āĻ্āώāϤি āϏীāĻŽিāϤ āĻā§°িāĻŦāϞৈ āĻি āĻĒāĻĻāĻ্āώেāĻĒ āϞোā§ąা āĻšৈāĻে? )
Answer:-
Post ID : DABP004565