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Question
In Pheretima, mouth develops from which of the following?
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Solution
The correct option is B Blastopore
Pheretima is the genus of earthworm. After zygote is formed, it divides by holoblastic and spiral cleavage, which results in the formation of blastula. The blastula remains enclosed in a vitelline membrane. Later, gastrula is developed by the invagination of endodermal cells into ectodermal cells. The gastrula contains archenteron cavity, which opens through a wide aperture called as the blastopore. The blastopore later becomes the mouth.
So, the correct answer is option C.
Pheretima is the genus of earthworm. After zygote is formed, it divides by holoblastic and spiral cleavage, which results in the formation of blastula. The blastula remains enclosed in a vitelline membrane. Later, gastrula is developed by the invagination of endodermal cells into ectodermal cells. The gastrula contains archenteron cavity, which opens through a wide aperture called as the blastopore. The blastopore later becomes the mouth.
So, the correct answer is option C.
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