. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group? (a) The chemical reactivity of metals increases. (b) The metallic character of elements increases. (c) The size of the atom increases. (d) The valence electrons increase.

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?