Fusion of male and female gamete produces a zygote. Repeated division of the zygote is called cleavage forming a solid morula. After further division and rearrangement a fluid filled cavity surrounded by blastomeres - blastula is formed. The appearance of germ layers mark the gastrula.

Correct Option: A

Fusion of male and female gamete produces a zygote. Repeated division of the zygote is called cleavage forming a solid morula. After further division and rearrangement a fluid filled cavity surrounded by blastomeres - blastula is formed. The appearance of germ layers mark the gastrula.

The amount of yolk and its distribution determines the type and depth of cleavage. Cleavage is effected due to yolk resulting in different types of segmentation or cleavage.

Correct Option: C

The amount of yolk and its distribution determines the type and depth of cleavage. Cleavage is effected due to yolk resulting in different types of segmentation or cleavage.

After ovulation egg comes in fallopian tube where it is fertilized by the sperm & cleavage starts here only.

Correct Option: C

After ovulation egg comes in fallopian tube where it is fertilized by the sperm & cleavage starts here only.

Perennials survive for more than two years and produce flowers and fruits during specific seasons.

Correct Option: D

Perennials survive for more than two years and produce flowers and fruits during specific seasons.

Gastrulation ends with the complete obliteration of blastocoel. The stage of three primary germ layers starts.

Correct Option: A

Gastrulation ends with the complete obliteration of blastocoel. The stage of three primary germ layers starts.