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Science [3 Mark Questions]

MODEL PAPER - 6 [2026] · CBSE STD 10 (CBSE - English Medium). 2 questions.

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[3 Mark Questions]

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Question 13 Marks
What is placenta? Describe its role during pregnancy.
Answer
Placenta is a special tissue which provides nutrition to the embryo from the mother's blood.
Role:
i. Provides a large surface area to transport glucose and $\mathrm{O}_{2}$ from mother's blood to embryo.
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Question 23 Marks
a. Name the two types of gametes produced by men.
b. Does a male child inherit X chromosome from his father? Justify.
c. How many types of gametes are produced by a human female?
Answer
a. Sperm having $X$ chromosome and sperm having $Y$ chromosome
b. No, As male child gets only Y chromosome from his father and X chromosome from mother to have XY chromosome.
c. One type/only ovum/egg
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[3 Mark Questions] - Science STD 10 Questions - Vidyadip