Evolution is the sequence of gradual changes which takes place in the primitive organisms, over millions of years, in which new species are produced. Variations that resulted in formation of new species occurred basically due to errors in DNA copying as well as due to sexual reproduction. Which of these is an acquired trait?

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?