Biogas is a better fuel than animal dung cake because (a) biogas has lower calorific value. (b) animal dung cake has high calorific value (c) biogas bums smoke and leaves no residue (d) biogas is used as a fuel for cooking only wheareas dung cake can be used for cooking, illuminant the lanterns.

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?