Q. 3. "Energy flow in food chains is always
unidirectional'. Justify this statement. Explain how
the pesticides enter a food chain and subsequently
get into our body.
Answers
Answer:
Energy is trapped by producers.(from the sun)
This energy cannot be reverted back to the sun.
It steadily goes to the next tropic level. And thus energy flows constantly in only one direction.Thus,unidirectional.
Also,biological magnification is how pesticides enter human body.
That is, harmful chemical like pesticides get mixed with water or soil.Since they are non biodegradable;they get concentrated and accumulated in every trophic level.The tertiary consumers being humans get the most amount of pesticides.
hope it helps you....
Answer:
energy flow in food chain is always unidirectional this is because the energy moves progressively through the various trophic levels it is no longer available to the previous level let's consider an situation the energy that is captured by the autotrophs does not revert back to the solar Input and the energy which passes to the herbivorous does not come back to the autotrophs