The diagram given below is that of a developing human foetus. Study th

1.	The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow :(i) Label the parts numbered 1 to 3 in the diagram. (ii) Mention any two functions of the part labelled 2 in the diagram. (iii) Explain the significance of the part numbered 3 in the diagram. (iv) Define the term ‘GestationWhat is the normal gestational period of the developing human embryo ? (v) Mention the sex chromosomes in a male and female embryo
Answer» (i) 1. Umbilical cord 2. Placenta 3. Amniotic cavity/Amniotic fluid (ii) Functions of Placenta: 1. Transfer nutrients and oxygen from mother’s blood to foetus. 2. Releases hormones called oestrogens, progesterone. (iii) Significance of Amniotic Fluid: 1. Protects the foetus against jerks, mechanical shocks, and injury. 2. Allows foetus movements. 3. Keeps the pressure even, around the foetus. 4. Prevent sticking of foetus to the amnion. (iv) Gestation : The full term of development of the embryo in the uterus. In a developing human embryo gestational period is of 280 days. (v) Male embryo = XY Female embryo = XX.

The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow :(i) Label the parts numbered 1 to 3 in the diagram. (ii) Mention any two functions of the part labelled 2 in the diagram. (iii) Explain the significance of the part numbered 3 in the diagram. (iv) Define the term ‘GestationWhat is the normal gestational period of the developing human embryo ? (v) Mention the sex chromosomes in a male and female embryo

Answer»

(i) 1. Umbilical cord 2. Placenta 3. Amniotic cavity/Amniotic fluid

(ii) Functions of Placenta:

1. Transfer nutrients and oxygen from mother’s blood to foetus.

2. Releases hormones called oestrogens, progesterone.

(iii) Significance of Amniotic Fluid:

1. Protects the foetus against jerks, mechanical shocks, and injury.

2. Allows foetus movements.

3. Keeps the pressure even, around the foetus.

4. Prevent sticking of foetus to the amnion.

(iv) Gestation : The full term of development of the embryo in the uterus. In a developing human embryo gestational period is of 280 days.