Q13 of 38 Page 106

Which of the following limits the number of trophic levels in a food chain?

Since only 10% of energy is transferred at each trophic level, so due to decrease in the amount of energy at each level, enough energy is not left for higher trophic levels. So, decrease in energy at different levels limits the number of trophic levels in a food chain.

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11

Excessive exposure of humans to U V-rays results in

(i). damage to immune system


(ii). damage to lungs


(iii). skin cancer


(iv). peptic ulcers

 12

In the following groups of materials, which group (s) contains only non-biodegradable items?

i. Wood, paper, leather


ii. Polythene, detergent, PVC


iii. Plastic, detergent, grass


iv. Plastic, bakelite, DDT

 14

Which of the statement is incorrect?

 15

Which group of organisms are not constituents of a food chain?

(i) Grass, lion, rabbit, wolf


(ii) Plankton, man, fish, grasshopper


(iii) Wolf, grass, snake, tiger


(iv) Frog, snake, eagle, grass, grasshopper