Question

name the largest group of animals. write the salient features of this group. give two examples?

Answer 1

Arthopods are the largest groups of animals.
1) They are triploblastic, bilaterally symmetrical and segmented animals.
2) Body cavity is filled with blood...Haemocoelic and open circulatory system is present.
3) Excretion is through Malpighian tubules ( insects) and green glands ( crab and prawn).
4) Respiration is through tracheae or book lungs.
5) They have tough exoskeleton made up of chitin.
Examples --- Palaemon ( prawn), Aranea (spider)

Answer 2

Arthropoda is the largest group of animals.
1) These organisms are triplobastic,bilaterally symmetrical .
2) They have jointed legs and have a open circulatory system.
3) It is the largest group of animals ,which are found in a variety of habitats like land ,moist soil ,fresh water ,marine water as well as on the bodies of other animals.
6) The body of Arthropods is divisible into head,thorax,and abdomen.
7) Respiration occurs by general body surface ,gills or book lungs.
8) Excretion takes place through malpighian tubules and green glands
9) Example : insects like cockroach , butterfly etc. and crustacea like prawns ,crabs etc.