The middle gastrula stage is characterized by:

  • A
    Formation of the yolk plug
  • B
    Archenteron just begins to form
  • C
    Blastopore and archenteron are present
  • D
    Yolk plug shifts towards the blastopore

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The cleavage in a frog is:

$A$: In frog,a gray crescent is formed during fertilization.
$R$: It is because the black pigment granules move away from the point of entry of the sperm in the animal half.

In which of the following is $Bidder's$ canal present?

The jelly layer of a frog's egg is:

Pasteels $(1945)$ described that gastrulation in aves takes place by:

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