Why does the percentage of gases like oxygen, nitrogen and carbon dioxide
remain almost the same in the atmosphere?
All the living organisms are basically made up of C, N, S, P, H and O. How
do they enter the living forms? Discuss.
Soil formation is done by both abiotic and biotic factors. List the names of
these factors by classifying them as abiotic and biotic?
Following are a few organisms
(a) lichen (b) mosses (c) mango tree (d) cactus
Which among the above can grow on stones; and also help in formation of
soil? Write the mode of their action for making soil.
In coastal area, wind current moves from the sea towards the land during
day; but during night it moves from land to the sea. Discuss the reason.
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