Burning magnesium ribbon is brought in the gas jar of carbon dioxide. Which of the following is correct? i.It keeps on burning ii.It gets extinguished iii.Although CO2 is non-supporter of combustion burning magnesium breaks CO2 into carbon and oxygen helps in burning iv.Carbon dioxide is the supporter of combustion A.(i) and (iv) B.(i) and (iii) C.(i) and (ii) D.(iii) and (iv)

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?