Question

5 distinguishing characteristics of porifera, cnidaria, ctenophora, platyhelminthes, nematoda, annelida, mollusca, arthropoda, echinodermata, hemichordata please answer fast its urgent​

Answer 1

$\huge\bf{Answer :}$

$\bf{Porifera :}$

• Members of these phylum consist numerous pores on their body.
• They are mostly marine organisms.
• Members of these phylum are covered with the hard outside layer.
• Their bodies have no symmetry.
• Examples - Sycon, Spongilla, Euplectella and Euspongia.

$\bf{Cnidaria :}$ (Coelenterata)

• Members of these phylum body is radially symmetrical and the animal acoelomate.
• These are free living or sedentary organisms.
• They have blind sac body plan with a single opening (mouth).
• Their nervous system is not well developed.
• Example - hydra

$\bf{Ctenophora :}$

• They are radially symmetrical.
• They are exclusively marine in habitat.
• sexual reproduction and external fertilization occurs in ctenophora.
• It includes species like fertilization.
• Example - Pleurobrachia

$\bf{Platyhelminthes :}$

• Body of animal is dorsoventrally flat means from top to bottom.
• Male or female sex organs are present in the same animals.
• Sexes may be unisexual but mostly are bisexual.
• They excrete from special organ called nephridia.
• Example = liver flukes, planaria, tapeworm.

$\bf{Nematoda :}$

• Members of these phylum are bilaterally symmetrical.
• These are triploblastic and pseudocoelomates.
• Nervous system is ladder like.
• Body is unsegmented.
• Examples = Ascaris, Ancylostoma, Wuchereria.

$\bf{Annelida :}$

• They have special organ for excretion named as nephridia.
• They are mostly respire through skin.
• RBCs are absent in them.
• These have mesmeric segmentation.
• Example - Earthworm and Nereis.

$\bf{ Mollusca :}$

• They've 3 parts : anterior head, a ventral muscular foot and dorsal visceral mass.
• They are triplobrastic.
• They have an open circulatory system.
• They have blue colour blood due to presence of haemocyanin.
• Example - Pila, oyster, squids, sepia, slugs, mussels.

$\bf{Arthropoda :}$

• Members of these phylum are triploblastic and haemocoelomates.
• These is open circulatory system, so blood does not flow in well defined blood vessels.
• Members of these phylum have colourless blood called haemolymph.
• These have compounds eyes on the head.
• Example - prawns, butterfly, housefly and spider.

$\bf{Echinodermata :}$

• Members of these phylum are spiny skinned organisms.
• They have a peculiar water driven tube system use for moving around.
• They have coelmic cavity.
• They have hard calcium carbonate structures.
• Example = starfish, sea unicorn, sea cucumber, Sea lilies, brittle stars.

$\bf{Hemichordata :}$

• Hemichordates are unisexual.
• Their body is divided into 3 parts : Proboscis, collar and trunks.
• Members of these phylum are bilateral symmetrical.
• Their pharynx consists many gill slits.
• Example - Tongue worm.

Answer 2

Answer:

$\purple{\bold{PORIFERA:-}}$

1. All are aquatic but few are found in fresh water too.
2. They are Sessile, solitary or colonial
3. Entire body has pores called Otista which acts as mouthhlets .
4. They have a single opening called Osculum
5. They have cellular level of organisation.

• ex- Sponģes

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$\purple{\bold{CNIDARIA:-}}$

1. They are Radially symmetrical
2. They have cnidoblasts or cnidocytes.
3. They exhibit Tissue level of oŕganisation.
4. They are diploblastic I.e. have two germ layers.
5. They have incomplete digestive system ànus is absent.

• ex- Hydra

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$\purple{\bold{CTENOPHORA:-}}$

1. Their body is soft and transparent.
2. Are Diploblastìc.
3. All are marine
4. They have lasso-cells which help in catchomf prey
5. They are hermaphroďite ie śexes aren't separate.

• ex- Ctenoplana, Beroe

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$\purple{\bold{PLATYHELMINTHES:-}}$

1. They are triploblastic
2. Have organ level of body organisation
3. They are acelomate
4. Locomotion is absent.
5. They have suckèrs and hòoks.

• ex- Liver fluke, tape worm

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$\purple{\bold{NEMATODA:-}}$

1. Have bilateral symmetry
2. Are triploblastic
3. Have organ system level of organisation
4. Circulatory system is absent
5. Sexeś are separate.

• ex- Round worm

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$\purple{\bold{ANNELIDA:-}}$

1. Symmetry is bilateral
2. Are triploblastic
3. Have organ system level of organisation
4. Have segmentation
5. Are eucoelomates

• ex- Nereis

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$\purple{\bold{MOLLUSCA:-}}$

1. Bilaterally symmetrical
2. Are triploblastic
3. Digestive tract is complete.
4. They are either terrestrial or aquatic
5. Have organ system level of organisation

• ex:- Snails

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$\purple{\bold{ARTHROPODA:-}}$

1. Body is bilateral
2. Triploblastic animals
3. Have organ system level of organisation
4. Digestive tract is complete
5. Have open circulatory system

• ex:- Butterfly

━━━━━━━━━━━━━━━━━

$\purple{\bold{ECHINODERMATA:-}}$

1. All are marine
2. Their skin has spines
3. Are triplovbastic
4. Have organ system level of organisation
5. Digestive tract is complete

• Ex:- sea urchin

━━━━━━━━━━━━━━━━━

$\purple{\bold{HEMICHORDATA:-}}$

1. Aniamls of this phylum are fossorial
2. They live in burrow
3. Bilaterally symmetrical
4. Triploblastic
5. Coelomate ie have a true coelom

• ex- Balanoglossus