Match the columns.
Column $I$ Column $II$
$(a)$ Mons pubis $(1)$ Embryo development
$(b)$ Antrum $(2)$ Sperm cell
$(c)$ Trophoblast layer $(3)$ External genitals of female
$(d)$ Mitochondria $(4)$ Graafian follicle

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(A) $(a - 3), (b - 4), (c - 1), (d - 2)$
Explanation:
- Mons pubis is a cushion of fatty tissue covered by skin and pubic hair,which is part of the external female genitalia.
- Antrum is the fluid-filled cavity present in the Graafian follicle.
- Trophoblast is the outer layer of the blastocyst that attaches to the endometrium and is involved in embryo development and placenta formation.
- Mitochondria are present in the middle piece of the sperm cell to provide energy for motility.

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$A$: Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$: The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage.

Column-$I$ contains terms and Column-$II$ contains definitions. Match them correctly and choose the right answer.
Column-$I$Column-$II$
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$B$. Gestation$2$. Release of egg from Graafian follicle
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Identify the incorrect statement.

If the number of chromosomes in most body cells of a mammal is $40$,the cells in the seminiferous tubule will have

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