fertilisation difter from external fertilisation!
What is a constellation? Write short notes on any two constellations.
What is a cell? Add short notes on:
Answers
Answer:
External Fertilization
When the fusion of sperm and egg takes place outside the female parent, it is called external fertilization. Only a minority of organisms exhibit this type of gamete fusion. For example, fish, frogs, etc. Here the female parent deposits her eggs in a place and later, the male parent ejects his sperms over them, then fusion takes place.
Gametes that fuse externally have to face many challenges. Since eggs and sperms are deposited in the external environment, the chances of fusion are very less. Predators may eat eggs and the zygote that is formed. To compensate for this loss, organisms like fish and frogs lay hundreds of eggs at a time.
• constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object. The origins of the earliest constellations likely go back to prehistory.
• notes on any two constellations.
Orion is one of the largest constellations in the sky. It is supposed to look like the warrior Orion from Greek mythology. Ursa Major is a constellation in the northern sky, whose associated mythology likely dates back into prehistory
• cell
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions.
Q. fertilisation difter from external fertilisation!
ans. Internal fertilization is the process when the syngamy (union of male and female gamete) occurs inside the female body after insemination using copulation. In contrast, External fertilization is the syngamy outside the female body, that is in the outer environment especially in water bodies.
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