Question

(a) Explain the formation of ozone layer. Write one cause of the depletion of ozone layer. (b) Name the phenomenon by which non-biodegradable chemicals get accumulated progressively at each trophic level of a food chain. (c) Construct a food chain of four trophic levels.

Answer 1

Answer:

Explanation:

(1) Ozone is naturally produced in the stratosphere by a two- step reactive process. In the first step, solar ultraviolet radiation (sunlight) breaks apart an oxygen molecule to form two separate oxygen atoms. ... In the over- all process, three oxygen molecules plus sunlight react to form two ozone molecules.

Answer 2

answer (a) : ozone layer is formed when the molecules of oxygen combine with oxygen its form ozone layer

                                        O2 + O ------- O3

depletion of ozone layer:

(1)cholorofloro carbon (CFC) is the main cause of depletion of ozone layer.

answer (b): biological magnificant.

answer (c): four tropic level

plant  ---   frog ----  snake ---- vulture

(1 tropic) (2 tropic)(3 tropic)(4 tropic)