Which one of the following is a cause of acid rains?
Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
Which group of organisms are not constituents of a food chain?
Select the correct option:
Flow of energy in an ecosystem is always
In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?Grass → Grasshopper → Frog → Snake → Hawk
In a food chain, the third trophic level is always occupied by
The process of nitrogen-fixation by bacteria does not take place in the presence of
The branchy part of a tree above the stem is known as
The coldest region on earth is the
The method of preparing compost with the help of earthworms is called
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