What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds? (i) Are poor conductors of electricity and (ii) Have low melting and boiling points? What happens when this compound burns in oxygen?

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?