Which is the example of conditioned reflex? A. Eyes closed when anything enters into it. B. Hand took up when pierced with a needle. C. Salivation in a hungry dog in response to ringing of a bell. D. Digested food goes forward in the alimentary canal.

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?