(a) What will happen to guard cells and the stomatal pore when water flows into guard cells. (b) How do plants transmit information from cell to cell?

In a food chain comprising frogs, insects, birds and grass, which one of the organisms is likely to have maximum concentration of harmful non-biodegradable chemicals in the body.

Updated 1/12/2026

(a) Write foil form of DNA. (b) Why are variations essential for the species ? (CCE 2011)

Updated 1/12/2026

What is geographical isolation? (b) Illustrate formation of a species with the help of an example where individuals are very different from each other and are capable of reproduction among themselves.

Updated 1/12/2026

What is ozone? How does it protect the organisms on the earth?

Updated 1/12/2026

What is reflex action? Explain the mechanism of reflex action with a suitable example.

Updated 1/12/2026