Take 25ml water in a beaker and pass electricity through it. The add little sulphuric acid in it. a) Why electricity didnot pass through pure water? b) What is your observation when H_2 SO_4 is added in water? c) Which type of ion formed more, when sulphuric acid is added in water.

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?