What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
"Energy flow in a food chain is unidirectional" Justify this statement.
Give reason to justify the following: The existence of decomposers is essential in a biosphere.
In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?Plants → Rats → Snakes → Hawks
Which of the following are always at the second tropic level of food chains?
What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain if the energy available at the first trophic level is 10,000 joules?
State with reason any two possible consequences of elimination of decomposers from the Earth.
What are decomposers?
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
List two biotic components of a biosphere.
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Explain how the pesticides enter a food chain and subsequently get into our body.
"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?
Which of the following constitute a food-chain?(a) Grass, wheat and mango(b) Grass, goat and human(c) Goat, cow and elephant(d) Grass, fish and goat
Why are green plants called producers?
List two important roles play in the environment by decomposers.
In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?
Plants → Deer → Lion
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain? Plants → Sheep → Man
List two main components of ecosystem?
The first trophic level in a food chain is always a green plant. Why ?
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
What will happen if we kill all the organisms in one trophic level?