(a) What is ovulation? How often does it happen in human females?
(b) Where does fertilisation take place in human females?
(c) Explain why fertilisation is possible if mating takes place during the middle of the menstrual cycle.
(d) What is meant by implantation?
(e) What is placenta? What is its function?
(f) What joins embryo to the placenta in mother's body?

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Solution

(a) Ovulation is the release of an ovum from the ovary. It happens once in 28 days in human females.

(b) Fertilisation takes place in fallopian tubes, or oviducts, in human females.

(c) Fertilisation is possible if mating takes place during the middle of the menstrual cycle because at that time, ovulation occurs and the egg is released.

(d) Implantation is the embedding of the embryo in the thick lining of the uterus.

(e) The placenta is a disc-like tissue that develops between the uterus wall and the embryo. It helps the embryo in meeting its requirements from the mother.

(f) The umbilical cord connects the embryo with the placenta in the mother's body.

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Similar questions

Given below are the names of certain stages/substances related to reproduction and found in human body. Answer the questions related to them,

(a) Foetus.

- Where is it contained ?

- How does it doffer from embryo ?

(b) Hyaluronidase.

- Is it an enzyme or simply a protein ?

- What is its function ?

-What is this stage ?

- Name the stage which comes next to it?

(d) Amniotic fluid.

- Where is it found ?

- What are its functions ?

(e) Placenta.

- What are the two sources that form placenta ?

- Name any two main substances which pass from foetus to mother through placenta.

- Name any two hormones it produces.

(f) Implantation.

- The development stage that undergoes this process.

- The approximate time after fertilisation, when it occurs.

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