Have you ever thought about how fertilization occurs in animals that breed with the help of an egg? We all know that basically the formation of an embryo is possible only through the fusion of a sperm and an egg. But how does this process occur in fish or birds? How does a sperm get into an egg or caviar?
What is a micropile in animals?
To understand how fertilization occurs in an egg, you need to clearly understand that its shell is not so impenetrable. On the contrary, there are many holes in its structure. What is a micropile? The answer is quite simple - this is the very hole. A sperm passes through it and fertilizes the egg, in this case the role of the female cell belongs to the calf or egg.
What is a micropile in birds? Their egg has two poles, among which vegetative and animal are distinguished. It is in the second that the micropile is located. Often this education is not one, but many.
What is a micropile in fish? In fish, it performs exactly the same function as in birds and other animals. The diameter of this hole is so small that, passing through it, one sperm will not allow the next to penetrate. That is why fish from one egg will produce no more than one fry.
What is a micropile in plant biology?
This structure is otherwise called pollen breeder. This organ of the plant acts as a conductor of pollen to the uterus. After delivery of the genetic material, fertilization occurs. The pollen breeder in plants is located in the integument of the ovule. Sometimes this structure is filled with obturator cells, and here the pollen tube just penetrates.
Summarize. The micropile plays the role of a sort of “vagina”, thanks to which male sex cells get clearly at the address. An interesting fact is that some fish (for example, sturgeon) have several similar formations. Sometimes their number reaches more than 43, but fertilization occurs only once and once. Why this happens is still not known, but the fact remains!