How are lungs designed in human beings to maximize the area of exchange of gases? A) Presence of a huge number of alveoli. B) Presence of a huge number of alveoli which possess a network of capillaries over their surface. C) Presence of a huge number of alveoli which possess a network of capillaries over their surface, functioning a respiratory surface. D) None of these.

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?