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प्रश्न
What is a placenta?
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उत्तर १
The placenta is a special disc-like organ that develops during pregnancy. It establishes a connection between the foetus and the uterine wall through the umbilical cord, enabling the exchange of substances between the mother and the foetus.
उत्तर २
The placenta is a temporary endocrine source that connects the foetus to the expectant mother’s uterine wall, allowing for physiological exchange.
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संबंधित प्रश्न
Find the odd one out and write it: vagina, uterus, vas deferens, ovary
Explain the process of fertilization in human beings.
Explain the process of development in human beings.
The germ cell A produced by a person X is round in shape and it fuses with another germ cell B having a long tail and produced by a person Y. The fusion of A and B produces a new cell C. The cell C divides repeatedly and grows inside the organ D of person X to form E in which the body features of the unborn baby are not much developed. E grows further to form F in which the various body features of the unborn baby (like hands, legs, head, eyes, and ears, etc.) can be identified. F grows further and ultimately forms a baby. What are A, B, C, D, E and F? Out of the two persons X and Y, which one is male and which one female?
Give appropriate term of the following:
The onset of reproductive phase in a young female.
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 |
Choose the Odd One Out:
Choose the Odd One Out:
______ is a lytic enzyme released by the sperm.
Distinguish between Vasa efferentia and Vasa deferentia.
