2.3 SHORT ANSWER QUESTIONS:
1. Why do living organisms need to reproduce
2. What are the two important methods of
reproduction?
3. What is menstruation?
4. Why do testes lie within the scrotum,
outside the body?
5. What is the significance of thick muscular
walls of uterus in females?
6. What do you mean by in vitro fertilisation?
7. State the difference between internal and
external fertilisations.
Answers
Answer:
2 and is,
Explanation:
to reproduce their own food
1. Organisms reproduce to continue the chain of life, to pass on its genes which are acquired over millennia. Reproduction is essentially a process by which individuals produce new individuals of the same kind. And this process is very important for the existence of life on earth.
2.The two modes of reproduction are :
¤ Sexual Reproduction
¤ Asexual Reproduction
3.The process of shedding of the uterine lining on a regular monthly basis is called menstruation. It starts at puberty and in the reproductive cycle of the female body.
4.The bag of skin that holds and helps to protect the testicles. The testicles make sperm. To do this, the temperature of the testicles needs to be cooler than the inside of the body. This is why the scrotum is located outside of the body.
5.The uterus is shaped like an upside-down pear, with a thick lining and muscular walls — in fact, the uterus contains some of the strongest muscles in the female body. These muscles are able to expand and contract to accommodate a growing fetus and then help push the baby out during labor.
6.In vitro fertilization (IVF) is a complex series of procedures used to help with fertility or prevent genetic problems and assist with the conception of a child. During IVF , mature eggs are collected (retrieved) from ovaries and fertilized by sperm in a lab.
7.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.