Differentiate between an exothermic and an endothermic reaction. (A) Endothermic releases heat and exothermic absorbs energy. (B) Exothermic releases heat and endothermic absorbs energy. (C) Hydrogen gas is evolved in exothermic but not in endothermic. (D) Hydrogen gas is evolved in endothermic but not in exothermic.

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?