Bark of this tree is used as a condiment
Cinnamon
Clove
Neem
Palm
A.
Cinnamon
The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is
4-6
2-4
8-10
12-16
The red, orange and yellow colours of leaves are due to
lignins
carotenoids
aldehydes
tannins
The disease that kills more people than lung cancer as a consequence of air pollution is
heart attack
chronic bronchitis
asthma
emphesema