1. What is fertilisation? Give examples
2. Draw a well labeled diagram of a male reproductive system
3. Explain the two modes of reproduction
4. What is ovum?
5. What is a male gamete? 6. Where does fertilization take place in human body.
7. Draw the structure of a sperm
Answers
Answer:
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Answer:
1) 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. ... Predators may eat eggs and the zygote that is formed.
2) The human male reproductive system consists of a scrotum, testes, testicular lobules, seminiferous tubules, urethra, and penis. The scrotum is a pouch of deeply pigmented skin divided into two separate sacs. Each sac contains one testis. Testes are the primary sex organs of the man. Each testicular lobules consists of 2-3 seminiferous tubules, blood vessels, nerves, and connective tissue. The male urethra is a common pathway for both semen and urine. The penis is the male copulatory organ and for conducting urine from the body.
3) There are two forms of reproduction: asexual and sexual. In asexual reproduction, an organism can reproduce without the involvement of another organism. Asexual reproduction is not limited to single-celled organisms. ... By asexual reproduction, an organism creates a genetically similar or identical copy of itself.
4) An egg, or ovum, is the female reproductive cell. An individual ovum is visible to the naked eye and one of the largest single cells in the body.
5) Gametes are an organism's reproductive cells.
6) A pregnancy starts with fertilization, when a woman's egg joins with a man's sperm.
7) The sperm cells are the haploid gametes which are produced in the male. There are different parts of the sperm cell.
(a) Acrosome: This structure contains enzymes used for penetrating the female egg.
(b) Nucleus: There is the genetic material which is a haploid genome because it contains only one copy of each chromosome.
(c) Middle piece: The middle piece has a central filamentous core with many mitochondria spiralled around it which is used for ATP production for the journey through the female cervix, uterus and uterine tube.
(d) Tail: There is a long tail which is used for swimming and reaching near the egg.