Multiple Choice
In the context of sponge anatomy, what name is given to the food-trapping cells responsible for capturing and digesting food particles?
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1. Introduction to Biology
Introduction to Taxonomy
Multiple Choice
Which characteristic is shared by all deuterostomes?
A
They undergo spiral cleavage during early development.
B
They have radial symmetry as adults.
C
They possess a chitinous exoskeleton.
D
The blastopore develops into the anus during embryonic development.
Verified step by step guidance1
Understand the term 'deuterostomes': Deuterostomes are a group of animals that share specific developmental characteristics during embryonic development.
Learn about the blastopore: In embryonic development, the blastopore is the opening that forms during gastrulation. In deuterostomes, the blastopore develops into the anus, which is a defining characteristic of this group.
Compare deuterostomes with protostomes: In protostomes, the blastopore develops into the mouth, whereas in deuterostomes, it develops into the anus. This distinction is key to understanding the difference between these two groups.
Clarify the incorrect options: Spiral cleavage is characteristic of protostomes, not deuterostomes. Radial symmetry as adults is seen in echinoderms (a subgroup of deuterostomes), but not all deuterostomes exhibit this trait. A chitinous exoskeleton is found in arthropods, which are protostomes, not deuterostomes.
Conclude with the correct characteristic: The defining feature of deuterostomes is that the blastopore develops into the anus during embryonic development, which sets them apart from other groups of animals.
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