Q8 of 70 Page 95

While living in and on the host species, the animal parasite has evolved certain adaptations. Describe these adaptations with examples.

Parasites have evolved special adaptations while living on and in the host species they are as follows:

(i) The loss of unnecessary sense organs for example: lice, mites and fleas don't have wings.


(ii) Presence of adhesive organs or suckers to cling on to the host for example - in tapeworms and leeches.


(iii) Loss of digestive system i.e., tapeworm.


(iv) High reproductive capacity i.e., roundworm produces large progeny.


More from this chapter

All 70 →
6

Discuss the various types of positive interactions between species.

 7

In an aquarium two herbivorous species of fish are living together and feeding on phytoplanktons. As per the Gause’s Principle, one of the species is to be eliminated in due course of time, but both are surviving well in the aquarium. Give possible reasons.

 9

Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable example.

 10

Which element is responsible for causing soil salinity? At what concentration does the soil become saline?