Question:
Which of the following statements is correct?
Which of the following statements is correct?
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Deuterostomes = radial cleavage + indeterminate development + enterocoelom formation.
Updated On: Jun 19, 2026
- All the enterocoelomates are deuterostomes and they exhibit radial and indeterminate cleavage
- All the enterocoelomates are protostomes and they exhibit radial and indeterminate cleavage
- All the enterocoelomates are deuterostomes and they exhibit spiral and determinate cleavage
- All the enterocoelomates are protostomes and they exhibit spiral and determinate cleavage
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The Correct Option is A
Solution and Explanation
Step 1: Understand enterocoelomates.
Enterocoelomates are animals in which the coelom is formed by outpocketing of the primitive gut (archenteron). This is a characteristic feature of deuterostomes.
Step 2: Link with deuterostomes.
All enterocoelomates belong to deuterostomes such as echinoderms and chordates. Therefore, their developmental pattern matches deuterostomes.
Step 3: Cleavage pattern in deuterostomes.
Deuterostomes exhibit radial cleavage during early embryonic development. This means the cleavage planes are parallel or perpendicular to the polar axis.
Step 4: Type of developmental fate.
They also show indeterminate cleavage, meaning the fate of early embryonic cells is not rigidly fixed and can develop into a complete organism.
Step 5: Eliminate incorrect options.
Protostomes show spiral and determinate cleavage, which contradicts all options (2), (3), and (4).
Step 6: Conclusion.
Thus, the correct statement is that all enterocoelomates are deuterostomes and they exhibit radial and indeterminate cleavage.
Enterocoelomates are animals in which the coelom is formed by outpocketing of the primitive gut (archenteron). This is a characteristic feature of deuterostomes.
Step 2: Link with deuterostomes.
All enterocoelomates belong to deuterostomes such as echinoderms and chordates. Therefore, their developmental pattern matches deuterostomes.
Step 3: Cleavage pattern in deuterostomes.
Deuterostomes exhibit radial cleavage during early embryonic development. This means the cleavage planes are parallel or perpendicular to the polar axis.
Step 4: Type of developmental fate.
They also show indeterminate cleavage, meaning the fate of early embryonic cells is not rigidly fixed and can develop into a complete organism.
Step 5: Eliminate incorrect options.
Protostomes show spiral and determinate cleavage, which contradicts all options (2), (3), and (4).
Step 6: Conclusion.
Thus, the correct statement is that all enterocoelomates are deuterostomes and they exhibit radial and indeterminate cleavage.
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