Q4 of 35 Page 130

Bacteria and fungi are responsible for the decay of dead plants and animals. Decaying matter is recycled to grow plants. What do we call this?

Bio-Geo chemical cycle.

Minerals are restored to the soil by the decomposition of dead and decaying materials by saprophytic organisms such as bacteria and fungi. This process is called Bio-Geo chemical cycle.


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2

Living organisms adapt themselves according to their habitat.

Match the following: -


 3

Fill in the blanks

i) Animals give out ________ through respiration.


ii) In the presence of sunlight, plants prepare ______.

 5

Fill in the blanks with suitable answers from those given in the brackets.

(harmful, heavy metals, carbon dioxide, sulphur particles)


Generation of waste products which contain Mercury, Uranium, Thorium, Arsenic, and other ________ are _______ to human health and environment. _______ present in the coal will cause acid rain and the release of _________, a greenhouse gas, causes climate change and global warming.

 6

Depict a food chain by placing the following organisms in the correct trophic levels:

(snake, grass, eagle, frog, grasshopper)