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प्रश्न
Give a biological explanation for the following.
The placenta is an important structure for the development of a foetus.
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उत्तर
- It supplies oxygen and nutrients from the mother to the foetus.
- It removes carbon dioxide and metabolic wastes from the foetus to the mother’s blood.
- It also secretes hormones that help maintain pregnancy.
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संबंधित प्रश्न
Which structure in human female is equivalent to the vas deferens in the male?and in what respect the structures are equivalent?
How long does a human baby take to develop before birth?
What is the role of the seminal vesicles in the human male reproductive system?
X and Y are two human beings. The organ A in the reproductive system of X releases a mature gamete B once a month which goes into a tube-like structure C through a funnel-like opening. The organ D in the reproductive system of Y makes and releases gametes E which pass through a duct F and are introduced by an organ of Y, into the body of X. B and E fuse together in C to form a new cell G. The cell G divides repeatedly to form a ball of cells H which gets embedded in the lining of organ I of reproductive system of X where it grows and develops into a baby.
(a) Name (i) organ A, and (ii) gamete B.
(b) Write two names of tube-like structure C.
(c) Name (i) organ D, and (ii) gamete E.
(d) Write two names of duct F.
(e) Name (i) cell G (ii) ball of cells H, and (iii) organ I.
(f) Out of X and Y, which one is (i) male, and (ii) female?
In humans, sperm production occurs in the organ ______.
Diagram shows the reproductive system of female human beings:
(i) Name the parts numbered 1 to 14.
(ii) Normally, after how many days does an ovary release an egg?
(iii) Where are the sperms released during coitus?
(iv) What is the role of sperms after their ejaculation in vagina?
(v) What is the function of the organ numbered 5?
(vi) What is the gestation period in human?
Complete the following statement by choosing the correct alternative:
Sterilization in female is due to cutting off of ______.
Name the Following
What does this abbreviation stand for LH?
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Acrosome
(ii) Ovulation (iii) Sperm (iv) Menopause (v) Implantation (vi) Fertilization (vii) Contraception in males |
(a) Male gamete
(b) Oviduct (c) Uterus (d) Spermatozoa (e) Progesterone (f) Stoppage of the menstrual cycle (g) Sudden change in genes |
