Devansh was asked to identify the test tube containing acetic acid out of the four test tubes A,B,C and D filled with different liquids. He smelled each of them and found. (i) A gave very sweet smell. (ii) B gave lighly pungent smell. (iii) C was odourless. (iv) D gave a bad odour. Which test tube contains acetic acid?

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?