A change in the amount of yolk and its distribution in the egg will affect pattern of cleavage. The pattern of cleavage is influenced by the amount of yolk in the egg. In eggs with less yolk, cleavages are equal, and the resulting blastomeres are of similar size. If the yolk is localized, such as in frog eggs, then cleavages are unequal, the cells derived from the yolky region (the vegetal pole) are larger than those derived from the region without yolk (the animal pole).

Correct Option: A

A change in the amount of yolk and its distribution in the egg will affect pattern of cleavage. The pattern of cleavage is influenced by the amount of yolk in the egg. In eggs with less yolk, cleavages are equal, and the resulting blastomeres are of similar size. If the yolk is localized, such as in frog eggs, then cleavages are unequal, the cells derived from the yolky region (the vegetal pole) are larger than those derived from the region without yolk (the animal pole).

An organizer is a signal aligning center that directs the development of embryo or part of embryo, e.g. in amphibians, it is dorsal tip of blastophore.

Correct Option: B

An organizer is a signal aligning center that directs the development of embryo or part of embryo, e.g. in amphibians, it is dorsal tip of blastophore.

Cleavage in the human zygote is holoblastic i.e. it divides the zygote and the blastomeres completely into daughter cells. But it is unequal as the blastomeres differ in size.

Correct Option: C

Cleavage in the human zygote is holoblastic i.e. it divides the zygote and the blastomeres completely into daughter cells. But it is unequal as the blastomeres differ in size.

Four extra-embryonic membranes are present in mammals which originally arise from trophoblast viz. amnion, chorion, allantois and yolk sac. The trophoblast is the outermost layer of cells in morula.

Correct Option: B

Four extra-embryonic membranes are present in mammals which originally arise from trophoblast viz. amnion, chorion, allantois and yolk sac. The trophoblast is the outermost layer of cells in morula.

The 28 days human ovarian cycle is called menstrual cycle. On 14th day a mature ovarian follicle leaves ovary & comes into the fallopian tube.

Correct Option: C

The 28 days human ovarian cycle is called menstrual cycle. On 14th day a mature ovarian follicle leaves ovary & comes into the fallopian tube.