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प्रश्न
Define the terms and give one example
Coelom
उत्तर
Coelom: Coelom is the internal body cavity between visceral organs and body wall in which well-developed organs can be accommodated. In some animals pseudocoelom is present (e.g. nematodes) which is a body cavity not lined by mesoderm. True coelom is lined by mesoderm and first appears in annelids. Examples of animals in which true coelom is present are Earthworm, cockroach, snail, all chordates such as birds, humans, etc.
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संबंधित प्रश्न
Give scientific reason .
Our body irritates if it comes in contact with jelly fish.
Draw a neat and labelled diagram.
Hydra
Match the following.
| PHYLUM | EXAMPLES | ||
| (A) | Coelenterata | (i) | Snail |
| (B) | Platyhelminthes | (ii) | Starfish |
| (C) | Echinodermata | (iii) | Tapeworm |
| (D) | Mollusca | (iv) | Hydra |
Why coelenterates are called diploblastic animals?
Real organs are absent in
______ are diploblastic.
What is polymorphism?
Which of the following traits is not shared by both sea anemones and jelly fish?
What is metagenesis? Mention an example which exhibits this phenomenon.
Give an example for the following:
Animal, which exhibits alternation of generation
