What is characteristic of deuterostomes?

Spiral cleavage, blastopore becoming mouth

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Radial cleavage, blastopore becoming anus

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Spiral cleavage, blastopore becoming anus

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Radial cleavage, blastopore becoming mouth

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Solution

The correct option is B Radial cleavage, blastopore becoming anus
Option (B) Radial cleavage, blastophore becoming anus.
$∙$ Radial pattern of embryonic cleavage.
Ex- phoromids, chaetognaths, chordaes excepting sea squirts.
$∙$ Blastopore becomes the adult anus and then the formation of mouth takes place from a second opening on the dorsal surface of the embryo.

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Similar questions

A. Swim bladder	1. Pouch
B. Amniotic egg	2. Animals where blastopore becomes anus
C. Marsupial have	3. An evolutionary development started in fish
D. Deuterostome	4. Reptiles, birds, mammals
	5. Organ of buoyancy
	6. Animals where blastopore becomes mouth

The characters given below are of a protostome. Identify the wrong statements.

1). Cleavage or division of the zygote is spiral and determinate.

2). During development process the mouth in these animals forms first and arises

from the blastopore or from its anterior margin.

3). Coelom or body cavity is formed due to splitting of mesoderm.

4). Mesoderm is derived from cells on anterior lip of blastopore.

5). Nerve cord is ventral in position.

6). Cell fate is determined the moment the cell is born.

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