The most important significance of fertilizin and antifertilizin reaction is to a. Preserve the sperm b. Ensure that at least few spermatozoa encounter the egg c. Mutually attract the gametes of opposite sexes d. Ensure fusion gametes of same species

What type of questions asked from the lesson of magnetic effect of electric current 

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?