Meroblastic cleavage refers to which type of division of egg?[1992]a)complete... moreb)incompletec)horizontald)spiralCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Hi shivam!
As the question is just asking what is meroblastic cleavage .
So i just want to say u dont go for other details just focus on words i mean meroblastic word can be split into two other words as mero(which means partial) and blastic so here we comes with the ans of this question. Mero(partial)blastic cleavage is partial division.
If this ans is helpful let me know by upvote.

Answer

In organisms that produce eggs with little yolk,the zygote divides by holoblastic cleavage. In such cleavage, the entire cells are divided equally. Egg cells that have larger quantities of yolk undergo meroblastic cleavage after fertilization,in which only a portion of the zygote undergoe cleavage.....So,the correct answer is option B.

Answer

In meroblastic cleavage zygote divides partially. This type of cleavage is found in mesolecithal and centrolecithal eggs like eggs of reptiles, birds, insects and egg-laying mammals.

Answer

Understanding Meroblastic Cleavage
Meroblastic cleavage is a type of embryonic division that occurs in certain types of eggs, particularly those that are rich in yolk. This phenomenon is crucial for the development of embryos in various species.
Key Characteristics of Meroblastic Cleavage:
- Incomplete Division: Unlike holoblastic cleavage, where the entire egg divides completely, meroblastic cleavage involves only a portion of the egg dividing. The presence of a large yolk inhibits complete division.
- Yolk Influence: The amount of yolk present in the egg determines the type of cleavage. In eggs with substantial yolk, such as those of birds and reptiles, the cleavage occurs only in the region where the cytoplasm is abundant, leaving the yolk largely undivided.
- Types of Cleavage: Meroblastic cleavage can be further categorized into different types based on the pattern of cell division, such as discoidal (common in birds) and superficial (found in some insects).
Developmental Implications:
- Embryo Formation: The incomplete nature of meroblastic cleavage results in the formation of a blastodisc—a small disc of cells on top of the yolk mass, which is crucial for further development.
- Species Examples: This type of cleavage is observed in the eggs of birds, reptiles, and some fish, where the yolk provides essential nutrients for the developing embryo.
In summary, meroblastic cleavage is characterized by incomplete division due to the presence of a significant yolk reserve, making option 'B' the correct answer.

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