Answer in Detail
3. Give an account on the classification of
invertebrates with few general features and
examples.
Answers
Answer:
Invertebrates are animals without a backbone.
The invertebrates have been classified into various phyla as follows:
S. No Division General Characters
1. Phylum protozoa
Eg. Amoeba Euglena Microscopic unicellular, Pseudopodia, flagella and cilia for locomotion, reproduce by fission or conjgation.
2. Phylum Porifera
Eg. Leucosolenia, Sycon. Multicellular organisms with holes in the body. Skeleton formed of spicules, asexual and sexual reproduction.
3. Phylum Coelenterata
Eg. Hydra, Jelly fish. Multicellular organisms Diploblastic, sessile or free swimming, solitary or colonial, asexual and sexual reproduction
4. Phylum Platyhelminthes Eg. Planaria, Liver fuke Acoelomates, parasites inside the body of animals and human beings, mostly hermaphrodite (bisexual).
5. Phylum Aschelminthes or Nematoda
Eg. Ascaris lumbricoides Unsegmented body, mostly parasites in human beings and animals, causing diseases, asexual reproduction.
6. Phylum Annelida
Eg. Earthworm, Leech. Triploblastic, segmented body, mostly hermaphrodite (bisexual and unisexual).
7. Phylum Arthropoda
Eg. Crab, Prawn Segmented body, thick chitinous cuticle forming an exoskeleton, paired and jointed legs, unisexual exhibits sexual dimorphism.
8. Phylum Mollusca
Eg. Cuttle fish, Snail Soft bodied, unsegmented, muscular head, foot and visceral mass, mantle, a calcareous shell, sexual reproduction.
9. Phylum Echinodermata
Eg. Starfsh, Sea – Urchin Exclusively marine, spines and spicules over the body, water vascular system, tube feet, for feeding, respiration and locomotion sexual reproduction.
Explanation: