For the given question two statements are given - one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these question from codes (i), (ii), (iii) and (iv) as given below: Assertion (A): In a reaction of copper oxide with hydrogen, hydrogen serves as reducing agent. Reason (R): A substance that gains oxygen in a chemical reaction is a reducing agent.

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?