Write the number of periods and groups in the Mordern Periodic Table. How the metallic character of elements vary on moving (a) form left to right in a period, and (b) down a group? Givew reason to justify your answer.

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?