Q18 of 163 Page 226

A food chain represents a unidirectional flow of X. What is X?

Unidirectional flow of X represents flow of energy in a food chain. Energy is transferred via trophic levels from producers to carnivores. The energy enters the plants from sun during photosynthesis. This energy is further passed on from one organism to another in the food chain .


More from this chapter

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16

Which organisms belong to third and fourth trophic levels in the food chain comprising the following?

Rats, Plants, Hawk, Snakes

 17

Which one term in the following includes the others?

Air, flora, fauna, environment, water, sunlight, soil

 19

Fill in the following blanks with suitable words:

(a) Decomposer organisms are................in their action.


(b) In nature, all green plants are..................... whereas animals are consumers.


(c) A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a..................


(d) The science that deals with the inter-relationships of living things with one another and their environment is called....................


(e) Plastic is a ......................material whereas paper is a..................material.

 20

Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.