These belong to the catergory of primary consumers …..
Snakes and frogs
Water insects
Eagle and snakes
Insects and cattle
It’s obvious.
In an ecosystem energy flows in
The number of trophic levels in a food chain is limited to $4$ or $ 5$ because
$A$ : In secondary productivity, no new organic matter is formed.
$R$ : It is only utilisation of part of food manufactured by primary producers in building of consumer biomass.
Which group of living organisms given below is a link in food chain between green plants and hawk
The dominant second trophic level, in a lake ecosystem, is
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