Propane burns in air according to the following equation : C_3H_8 +5O_2 rarr 3CO_2 + 4H_2O. What volume of propane is consumed on using 1000 cm^3 of air, considering only 20% of air contains oxygen ?

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?