How is the bask of trees utilised by us?

What do trees give us ?

How does the removal of a ring of bark and wood from the trunk of a tree kills it ?

10 grams of 90% pure limestone is thermally decomposed. If the gas liberated is utilised for the conversion of aqueous sodium carbonate, how many moles of bicarbonate is formed?

A tree stands vertically on the slant of the hills From a point A on the ground 35 meters. Down the hill from the base of the tree , the angle of elevation of the top of the tree is 60 ^(@) . If the angle of elevation of the foot of the tree A is 15 ^(@) , then the height of the tree.

How is the study of plant anatomy useful to us?

'Christmas tree' is :

Is there any tree without animals ?

How are tears useful to us?