One student was assigned he experiment of interaction of iron nail with a solution of copper sulphate. What observationss he/she would have recorded as per given below ? (a) Initial colour of the solution. Final colour of the solution (c) Change in the colour of iron nail. Mention the type of this reaction.

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?