Crystals of copper sulphate are heated in a test tube for some time. What is the colour of copper sulphate (i) before heating and (ii) after heating? What are the source liquid droplets seen on the upper side of the test tube during the heating process?

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?