Distinguish between the average speed and the average velocity. a) Average speed is total displacement per unit time while average velocity is total distance travelled per unit time. b) Average speed is total distance travelled per unit time while average velocity is total displacement per unit time. c) Average speed is vector while average velocity is scalar quantity. d) All of the above.

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?