Q13 of 163 Page 240

Why are there rarely more than five links (or five organisms) in a food chain?

There are rarely more than five organisms in a food chain because there is a decrease in energy with every transfer to next trophic level and energy availability will be so small that animals will not be able to survive with small amount of energy.


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11

State whether the following statement is true or false:

Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level a food chain.

 12

Where does all the energy in living organisms originate from?

 14

Name two predators of snakes in a food web operating in a forest ecosystem.

 15

Fill in the following blanks with suitable words :

(a) Ultraviolet rays can cause skin.................


(b) Pesticides enter the food chain at the ..............level


(c) Grass ………………………. Human


(d) lettuce …………………………. Fox


(e) Plants Antelope ……………….