Read the following statements regarding food chains and select the correct ones . i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation. ii) Removal of most of the carnivores resulted in an increased population of deers. iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss. iv) The length of the food chains may vary from 2-8 trophic levels.

i and ii ii and iii i and iii iii and iv

ii and iii

Tigers are carnivores. So removing 80% of tigers will result in an increase of herbivores which can result in greatly decreased the growth of vegetation. The energy available at any trophic level in a food chain is 10% of the previous trophic level. The length of food chains is generally limited to 3-4 trophic levels only due to energy loss.