Explain simple microscope on the basis of the following points: (a) Ray diagram for the formation of image; (b) Expression for magnifying power when the final image is formed: (i) At the least distance of distinct vision; (ii) At infinity.

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?

Why is water liquid at room temperature?