(a) Write the name given to bases that are highly soluble in water. Give an example. (b) How is tooth decay related to pH? How can it be prevented? (c) Why does bee sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How?

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?