A body dropped from the top of a tower covers a distance 9x in the last second of its journey where x is the distance covered in the first second. How much time does it take to reach the ground? A. 3sec B. 4sec C. 5sec D. 6sec

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?