Q1 of 287 Page 362

What is biosphere?

Biosphere is living mantle of Earth which constitutes all the life forms of the planet.


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5

List the chemical whose biomagnifications result in following diseases in humans : (i) Minamata disease; (ii) Itai Itai disease.

 6

(a) List two bacteria which bring about nitrification.

(b) List one denitrifying bacteria.


(c) List any two bacteria which play a role in biological nitrogen fixation.

 2

Name the physical divisions of biosphere.

 3

What are natural resources?