A) zoospore
B) oospore
C) blastopore
D) gonophores
Correct Answer: C
Solution :
Gastrula is the embryonic stage of development, in which, the germinal layers have been formed. Archenteron is the cavity which occurs inside the gastrula. It opens to the outside through blastopore, which later on closes. Thus, blastopore, is the opening of archenteron.
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