The correct statements with reference to single celled organisms are (i) Complex substances are not broken down into simpler substances. (ii) Simple diffusion is sufficient to meet the requirement of exchange of gases. (iii) Specialised tissues perform different functions in the organisms. (iv) Entire surface of the organism is in contact with the environment for taking in food.

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?