Correct Option (b)
Reason : Blastopore is the opening of gastrocoel. Gastrulation is a process of migration and rearrangement of cells which are already present in blastula, a new cavity is formed named archenteron or gastrocoel which open outside through blastopore.
Correct Option (b) Reason : Blastopore is the opening of gastrocoel. Gastrulation is a process of migration and rearrangement of cells which are already present in blastula, a new cavity is formed named archenteron or gastrocoel which open outside through blastopore.