Question

Read the sources given and answer any four from the questions given below:

After implantation, a special tissue called placenta, develops between the embryo and the uterine wall of the mother. Placenta consists of foetal part, the chorion as well as the maternal tissue-the decidua basalis. The placenta helps in the exchange of the nutrients and gases between the mother and the foetus. It is also involved in the removal of wastes produced by the growing foetus. Placenta is connected to the foetus via umbilical cord. Placenta also produces a number of proteins and different hormones like human chorionic gonadotropin (hCG), human placental lactogen (hpl), oestrogen and progesterone. Because hCG comes from the embryonic chorion and not the mother, this hormone is tested for in all pregnancy tests. In the later stages of pregnancy, placenta also secretes a hormone called relaxin which facilitates childbirth by dilating the cervix at the time of parturition.

1. Placenta consists of the following tissues.
   1. only foetal tissue
   2. chorion
   3. decidua basalis
   4. both (b) and (c)
2. Which of the following hormone is tested in pregnancy tests to confirm pregnancy?
   1. oestrogen
   2. hCG
   3. progesterone
   4. hpl
3. Which of the following is not a function of placenta?
   1. remove wastes from maternal blood
   2. supply nutrients from mother to foetus
   3. supply oxygen to foetus
   4. remove wastes from foetus to maternal blood
4. The hormone hCG is produced from the
   1. ovary
   2. uterine lining of mother
   3. chorion of embryo
   4. pituitary gland
5. The function of relaxin is to
   1. maintain pregnancy
   2. stop ovulation
   3. dilate cervix
   4. maintain placenta

Answer 1

1. both (b) and (c)
2. hCG
3. remove wastes from maternal blood
4. chorion of embryo
5. dilate cervix