In spiral cleavage, planes are

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Vertical

Horizontal

Subequatorial

Oblique

answer is D.

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Detailed Solution

Concept: Depending upon the quantum of thralldom in the egg, the fractionalization can be holoblastic( aggregate or whole fractionalization) or meroblastic( deficient fractionalization). The pole of the egg with the loftiest attention of thralldom is indicated to as the vegetal pole while the contrary is indicated to as the beast pole. The aeroplane of fractionalization can be-
The helical fractionalization is the common type of development in the early embryo. In this process division of the embryo occurs and the cells form a helical around the pole to pole axis of the embryo. In this the aeroplane's fractionalization is oblique.
The perpendicular fractionalization occurs when a crinkle doesn't pass through the median axis from the beast pole towards the contrary pole.
Vertical aeroplane fractionalization, the crinkle runs through the cytoplasm through the tropical aeroplane.
Sub tropical aeroplane fractionalization is the fractionalization where the line dives the eggs half between the beast pole and the vegetative pole.
Hence, option 4 is the correct answer

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