Question 20
Corals are

(a) Poriferans attached to some solid support
(b) Cnidarians, that are solitary living beings
(c) Poriferans present at the sea bed
(d) Cnidarians who live in colonies

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Solution

Ans) (d) Cnidarians who live in colonies

Corals belong to phylum Cnidarians and live in colonies.

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Question 20
Corals are

(a) Poriferans attached to some solid support
(b) Cnidarians, that are solitary living beings
(c) Poriferans present at the sea bed
(d) Cnidarians who live in colonies

Q. State whether true or false:
Poriferans and Cnidarians are radially symmetrical.

Q. Enlist the characteristic features of cnidarians which show advancement over poriferans?

Q. Corals are poriferans with asymmetrical body.

Q. Corals are the common representatives of the Cnidarian class

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Water Canal System

Standard XII Biology

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Question 20 Corals are (a) Poriferans attached to some solid support (b) Cnidarians, that are solitary living beings (c) Poriferans present at the sea bed (d) Cnidarians who live in colonies

Ans) (d) Cnidarians who live in colonies Corals belong to phylum Cnidarians and live in colonies.

Question 20
Corals are

(a) Poriferans attached to some solid support
(b) Cnidarians, that are solitary living beings
(c) Poriferans present at the sea bed
(d) Cnidarians who live in colonies

Ans) (d) Cnidarians who live in colonies

Corals belong to phylum Cnidarians and live in colonies.