Parasite is an organism which always lives inside the body of other organism and may kill it.

Host is an organism which provides food to another organism.

Amensalism is a relationship in which one species is benefited where as the other is unaffected

Predator is an organism that catches and kills other organism for food.

B

A

D

C

Uttarakhand

Assam

Uttar Pradesh

Himachal Pradesh

Sieve elements

Transfusion tissue

Companion cells

Tracheids