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16. Select the group which contains only non-biodegradable items. (NTSE Haryana, Stage-I, 2015-16)

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17. What will happen if snake is removed from the food chain given below?

Grains →Rat  →7 Snake  → Eagle

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18. Various trophic levels of an ecological pyramid given below have been indicated as T1, T2, T3 and T4.In which trophic level maximum energy will be available? (NTSE West Bengal, Stage-I, 2015-16)  

photosynthesis

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19. Which of the following is not a biodegradable material? (NTSE Madhya Pradesh, Stage-I, 2015-16)

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20. Which one of the following is a primary consumer of any food chain? (NTSE Chhattisgarh, Stage-I, 2015-16)

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