1. Inform you about time table of exam.
2. Inform you about new question papers.
3. New video tutorials information.
- Our Environment part 6 (Flow of energy in food chain)
undefined video tutorial00:10:38
- Our Environment part 8 (Food web)
undefined video tutorial00:06:14
- Our Environment part 7 (Biological Magnification)
undefined video tutorial00:09:22
- Our Environment part 5 (Food chain)
undefined video tutorial00:08:28
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?
"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?
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
"Energy flow in a food chain is unidirectional" Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
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?
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
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?