Chapter 2: Human Reproduction Assertion-Reason Questions | biology Class 12 CBSE

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Chapter 2: Human Reproduction Assertion-Reason Questions | biology Class 12 CBSE | ByteNotes.in

Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 1

Logic Check

Assertion (A): The testes in humans are located in the scrotum outside the abdominal cavity. Reason (R): Spermatogenesis requires a temperature slightly lower than normal body temperature.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 2

Logic Check

Assertion (A): Sertoli cells are found in the seminiferous tubules. Reason (R): Sertoli cells synthesise and secrete androgens.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 3

Logic Check

Assertion (A): LH surge on the 14th day of the menstrual cycle triggers ovulation. Reason (R): LH acts on the Graafian follicle and causes it to rupture, releasing the secondary oocyte.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 4

Logic Check

Assertion (A): The sex of the baby is determined by the mother. Reason (R): All ova produced by the mother carry only the X chromosome.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 5

Logic Check

Assertion (A): Colostrum is important for the newborn. Reason (R): Colostrum contains antibodies that provide immunity to the newborn.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 6

Logic Check

Assertion (A): Fertilisation in humans occurs in the isthmus of the fallopian tube. Reason (R): Sperms are transported from the vagina to the ampullary region to meet the ovum.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 7

Logic Check

Assertion (A): The placenta acts as an endocrine gland. Reason (R): The placenta produces hormones like hCG, hPL, estrogens, and progestogens.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 8

Logic Check

Assertion (A): Menstruation occurs when the fertilised ovum fails to implant. Reason (R): In the absence of fertilisation, the corpus luteum degenerates, leading to a fall in progesterone and breakdown of the endometrium.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 9

Logic Check

Assertion (A): Primary oocytes are present in the ovary from birth. Reason (R): Oogonia are formed during embryonic development and enter prophase I of meiosis to become primary oocytes before birth.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 10

Logic Check

Assertion (A): Oxytocin is involved in a positive feedback loop during parturition. Reason (R): Oxytocin causes uterine contractions, which stimulate further release of oxytocin from the maternal pituitary.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 11

Logic Check

Assertion (A): The presence or absence of hymen is a reliable indicator of virginity. Reason (R): The hymen can be broken by activities like horseback riding, cycling, or insertion of a vaginal tampon.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 12

Logic Check

Assertion (A): Spermatogenesis begins at puberty. Reason (R): Increased secretion of GnRH at puberty stimulates LH and FSH release, which in turn regulate spermatogenesis.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 13

Logic Check

Assertion (A): The morula transforms into a blastocyst as it moves toward the uterus. Reason (R): The blastocyst consists of an outer trophoblast and an inner cell mass.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 14

Logic Check

Assertion (A): The acrosome of the sperm helps in penetrating the ovum. Reason (R): The acrosome contains enzymes that dissolve the zona pellucida and plasma membrane of the ovum.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 15

Logic Check

Assertion (A): Oogonia continue to be formed throughout the reproductive life of a woman. Reason (R): Oogenesis is initiated during the embryonic development stage, and no more oogonia are added after birth.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 16

Logic Check

Assertion (A): Each testicular lobule contains one to three highly coiled seminiferous tubules. Reason (R): Sperms are produced within the seminiferous tubules.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 17

Logic Check

Assertion (A): The endometrium is essential for implantation. Reason (R): The myometrium undergoes cyclic changes during the menstrual cycle to prepare for implantation.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 18

Logic Check

Assertion (A): Fimbriae play an important role in collecting the ovum after ovulation. Reason (R): Fimbriae are finger-like projections at the edges of the infundibulum of the fallopian tube.

Reasoning Options

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Assertion-Reason

Hard difficulty • Check the statement and reason

Hard

Question 19

Logic Check

Assertion (A): The secondary spermatocyte is diploid. Reason (R): Secondary spermatocytes are formed after the second meiotic division.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 20

Logic Check

Assertion (A): Implantation marks the beginning of pregnancy. Reason (R): The blastocyst embeds in the endometrium of the uterus during implantation.

Reasoning Options

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Chapter sections

Chapter 2: Human Reproduction | Assertion-Reason

Assertion (A): The testes in humans are located in the scrotum outside the abdominal cavity. Reason (R): Spermatogenesis requires a temperature slightly lower than normal body temperature.

Assertion (A): Sertoli cells are found in the seminiferous tubules. Reason (R): Sertoli cells synthesise and secrete androgens.

Assertion (A): LH surge on the 14th day of the menstrual cycle triggers ovulation. Reason (R): LH acts on the Graafian follicle and causes it to rupture, releasing the secondary oocyte.

Assertion (A): The sex of the baby is determined by the mother. Reason (R): All ova produced by the mother carry only the X chromosome.

Assertion (A): Colostrum is important for the newborn. Reason (R): Colostrum contains antibodies that provide immunity to the newborn.

Assertion (A): Fertilisation in humans occurs in the isthmus of the fallopian tube. Reason (R): Sperms are transported from the vagina to the ampullary region to meet the ovum.

Assertion (A): The placenta acts as an endocrine gland. Reason (R): The placenta produces hormones like hCG, hPL, estrogens, and progestogens.

Assertion (A): Menstruation occurs when the fertilised ovum fails to implant. Reason (R): In the absence of fertilisation, the corpus luteum degenerates, leading to a fall in progesterone and breakdown of the endometrium.

Assertion (A): Primary oocytes are present in the ovary from birth. Reason (R): Oogonia are formed during embryonic development and enter prophase I of meiosis to become primary oocytes before birth.

Assertion (A): Oxytocin is involved in a positive feedback loop during parturition. Reason (R): Oxytocin causes uterine contractions, which stimulate further release of oxytocin from the maternal pituitary.

Assertion (A): The presence or absence of hymen is a reliable indicator of virginity. Reason (R): The hymen can be broken by activities like horseback riding, cycling, or insertion of a vaginal tampon.

Assertion (A): Spermatogenesis begins at puberty. Reason (R): Increased secretion of GnRH at puberty stimulates LH and FSH release, which in turn regulate spermatogenesis.

Assertion (A): The morula transforms into a blastocyst as it moves toward the uterus. Reason (R): The blastocyst consists of an outer trophoblast and an inner cell mass.

Assertion (A): The acrosome of the sperm helps in penetrating the ovum. Reason (R): The acrosome contains enzymes that dissolve the zona pellucida and plasma membrane of the ovum.

Assertion (A): Oogonia continue to be formed throughout the reproductive life of a woman. Reason (R): Oogenesis is initiated during the embryonic development stage, and no more oogonia are added after birth.

Assertion (A): Each testicular lobule contains one to three highly coiled seminiferous tubules. Reason (R): Sperms are produced within the seminiferous tubules.

Assertion (A): The endometrium is essential for implantation. Reason (R): The myometrium undergoes cyclic changes during the menstrual cycle to prepare for implantation.

Assertion (A): Fimbriae play an important role in collecting the ovum after ovulation. Reason (R): Fimbriae are finger-like projections at the edges of the infundibulum of the fallopian tube.

Assertion (A): The secondary spermatocyte is diploid. Reason (R): Secondary spermatocytes are formed after the second meiotic division.

Assertion (A): Implantation marks the beginning of pregnancy. Reason (R): The blastocyst embeds in the endometrium of the uterus during implantation.

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