What is hydrosphere?

Match column I with column II and select the correct option from the given codes. {:("column I","Column II"),("Presence of 3-4 storeyed plant crowns in a forest",(i)"Blue green algae"),("A biome having grasses with scattered trees",(ii)"Stratification"),("Man made ecosystem",(iii)"Savannah"),("Pioneer in hydrosphere",(iv)"Dam"):}

Read the given statement and select the correct option. Statement 1: Global water cycle does not involver the living organisms. Statement 2 : In global water cycle. Water circulates between hydrosphere and atmosphere.

What is a thermopile? On what principle does it work?

a. What is positron ? " " b. What is its charge ?

(a) What is diaphragm? (b) What is the significance of caecum in rabbit?

What is an ideal gas? (or) What is perfect gas?