Which of the following is incorrect matching of animal group / life style / structure / function?
Animal group Life style Structure/function
1. Sponges Sessile filter feeders (i) Choanocytes / circulating water
(ii) Spicules and spongin fibres / skeleton
2. Cnidarian Free-floating or attached (i) Gastrovascular cavity / digestion
(ii) Cnidocytes / protection and food gathering
3. Flatworms Free living or parasitic (i) Flame cells / excretion
(ii) Tegument / protection
4. Roundworms Free living or parasites only in animals (i) Pseudocoelom
(ii) One way gut / digestion with muscular pharynx

Easy

Solution

Roundworms may be free-living, aquatic and terrestrial or parasitic in plants and animals. Roundworms have complete digestive system with a muscular pharynx.
One way gut is found in members of Platyhelminthes.

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	Animal group	Life style	Structure/function
1.	Sponges	Sessile filter feeders	(i) Choanocytes / circulating water (ii) Spicules and spongin fibres / skeleton
2.	Cnidarian	Free-floating or attached	(i) Gastrovascular cavity / digestion (ii) Cnidocytes / protection and food gathering
3.	Flatworms	Free living or parasitic	(i) Flame cells / excretion (ii) Tegument / protection
4.	Roundworms	Free living or parasites only in animals	(i) Pseudocoelom (ii) One way gut / digestion with muscular pharynx