From the given cells: Lead storage cell, mercury cell, fuel cell and dry cell Answer the following: i. Which cell is used in hearing aids? ii. Which cell was used in the Apollo space programme? iii. Which cell is used in automobiles and inverters? iv. Which cell does not have a long life?

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?