What is biological significance of Azotobacter in agriculture?

How can water pollution be controlled?

What is biological significance of golden rice production?

What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

A : A few toxic substance often present in industrial waste waters undergo biological magnification. R : A toxic substance can easily be metabolised or excreted by organism.

The magnification for a mirror is -3. How are u and v related?

What are pollutants? How are they classified?

What are biofertilisers? What are the main sources of biofertilisers? What is biological N_2 fixation? Name two organisms each of which fix nitrogen asymbiotically and symbiotically.

A cardsheet divided into squares each of size 1 mm^(2) is being viewed at a distance of 9 cm through a magnifying glass (a conerging lens of focal length 10 cm ) held close to the eye. (a) What is the magnification produced by the lenas ? How much is the area of each square to the virtual image ? (b) What is the angular magnification (magnifying power) of the lens ? ( c) Is the magnification in (a) equal to the magnifying power in (b) ? Explain

What are pollutants ? How are they classified?