Biology
Assertion (A): Scavengers are considered as cleaners of the earth as they feed on dead animal and plant remains.
Reason (R): Scavengers consume the remains left by detritivores and decomposers.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Ecosystems
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Answer
A is true but R is false.
Reason — A is true as scavengers are called “cleaners of the environment” because they feed on dead animals (and sometimes plant remains). Examples include vultures and hyenas.
R is false as scavengers do not consume remains left by detritivores and decomposers. Scavengers eat dead organisms directly. Detritivores (like earthworms) and decomposers (like bacteria, fungi) act on dead matter after scavengers or alongside them.
Therefore, A is true but R is false is the correct option.
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Reason (R): The transfer of energy from one trophic level to the other always occurs through the food chain.
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Reason (R): Different regions of the world have different climatic conditions, so only those plants and animals that are adapted to those conditions can survive there.
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Fill in the blanks :
(a) Lichens are the good example of …………… association.
(b) Two intermediate hosts of liver fluke are …………… and …………… .
(c) Evergreen trees are common flora of …………… forests.
(d) …………… will always be trophic level-1 in a food chain.
(e) …………… sanctuary is found in West Bengal which is famous for rhinoceros.
Mention if the following statements are true (T) or false (F):
(a) Snakes are primary consumers.
(b) Some humans are strictly primary consumers while others are secondary or tertiary consumers as well.
(c) No ecosystem can survive without light.