286517
Assertion : During fertilisation, acrosome help the sperm enter into the cytoplasm through zona pellucida. Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Fertilisation is the fusion of male and female gametes to form zygote. During fertilisation, only head of the sperm enters the egg. After that polyspermy is avoided by fertilisation membrane.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286518
Assertion : Corpus luteum degenerates in the absence of fertilisation.
Reason : Progesterone level decreases.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) In female, Graafian follicle forms corpus luteum after ovulation. The cells of corpus luteum are called luteal cells. The cytoplasm of luteal cells have yellow granules called lutein which secrete the hormone progesterone to maintain pregnancy if fertilisation takes place. In the absence of fertilisation, corpus luteum degenerates and forms corpus albicans and there is decrease in progesterone level as well.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286519
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason :Middle piece contains spiral row of mitochondria.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) Head of a sperm has acrosome but the spiral row of mitochondria are present in the mid (connecting) piece of the sperm.
NCERT Page-48/N N-32
Human Reproduction(NCERT)
286520
Assertion : Testicular lobules are the compartments present in testis.
Reason : These lobules are involved in the process of fertilisation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Testicular lobules, the compartments present in the testes, are not involved in the process of fertilisation as whole. Fusion of male and female gametes is called fertilisation.
NCERT Page-43 / N-27
Human Reproduction(NCERT)
286521
Assertion: Placenta is an endocrine Tissue.
Reason: It secretes many hormones during pregnancy.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d) Placenta is an endocrine gland that is present only during pregnancy. It is responsible for production of various hormones like human chorionic gonadotropin (hCG), oestrogen, progesterone, human placental lactogen (hPL).
286517
Assertion : During fertilisation, acrosome help the sperm enter into the cytoplasm through zona pellucida. Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Fertilisation is the fusion of male and female gametes to form zygote. During fertilisation, only head of the sperm enters the egg. After that polyspermy is avoided by fertilisation membrane.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286518
Assertion : Corpus luteum degenerates in the absence of fertilisation.
Reason : Progesterone level decreases.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) In female, Graafian follicle forms corpus luteum after ovulation. The cells of corpus luteum are called luteal cells. The cytoplasm of luteal cells have yellow granules called lutein which secrete the hormone progesterone to maintain pregnancy if fertilisation takes place. In the absence of fertilisation, corpus luteum degenerates and forms corpus albicans and there is decrease in progesterone level as well.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286519
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason :Middle piece contains spiral row of mitochondria.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) Head of a sperm has acrosome but the spiral row of mitochondria are present in the mid (connecting) piece of the sperm.
NCERT Page-48/N N-32
Human Reproduction(NCERT)
286520
Assertion : Testicular lobules are the compartments present in testis.
Reason : These lobules are involved in the process of fertilisation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Testicular lobules, the compartments present in the testes, are not involved in the process of fertilisation as whole. Fusion of male and female gametes is called fertilisation.
NCERT Page-43 / N-27
Human Reproduction(NCERT)
286521
Assertion: Placenta is an endocrine Tissue.
Reason: It secretes many hormones during pregnancy.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d) Placenta is an endocrine gland that is present only during pregnancy. It is responsible for production of various hormones like human chorionic gonadotropin (hCG), oestrogen, progesterone, human placental lactogen (hPL).
286517
Assertion : During fertilisation, acrosome help the sperm enter into the cytoplasm through zona pellucida. Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Fertilisation is the fusion of male and female gametes to form zygote. During fertilisation, only head of the sperm enters the egg. After that polyspermy is avoided by fertilisation membrane.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286518
Assertion : Corpus luteum degenerates in the absence of fertilisation.
Reason : Progesterone level decreases.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) In female, Graafian follicle forms corpus luteum after ovulation. The cells of corpus luteum are called luteal cells. The cytoplasm of luteal cells have yellow granules called lutein which secrete the hormone progesterone to maintain pregnancy if fertilisation takes place. In the absence of fertilisation, corpus luteum degenerates and forms corpus albicans and there is decrease in progesterone level as well.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286519
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason :Middle piece contains spiral row of mitochondria.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) Head of a sperm has acrosome but the spiral row of mitochondria are present in the mid (connecting) piece of the sperm.
NCERT Page-48/N N-32
Human Reproduction(NCERT)
286520
Assertion : Testicular lobules are the compartments present in testis.
Reason : These lobules are involved in the process of fertilisation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Testicular lobules, the compartments present in the testes, are not involved in the process of fertilisation as whole. Fusion of male and female gametes is called fertilisation.
NCERT Page-43 / N-27
Human Reproduction(NCERT)
286521
Assertion: Placenta is an endocrine Tissue.
Reason: It secretes many hormones during pregnancy.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d) Placenta is an endocrine gland that is present only during pregnancy. It is responsible for production of various hormones like human chorionic gonadotropin (hCG), oestrogen, progesterone, human placental lactogen (hPL).
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Human Reproduction(NCERT)
286517
Assertion : During fertilisation, acrosome help the sperm enter into the cytoplasm through zona pellucida. Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Fertilisation is the fusion of male and female gametes to form zygote. During fertilisation, only head of the sperm enters the egg. After that polyspermy is avoided by fertilisation membrane.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286518
Assertion : Corpus luteum degenerates in the absence of fertilisation.
Reason : Progesterone level decreases.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) In female, Graafian follicle forms corpus luteum after ovulation. The cells of corpus luteum are called luteal cells. The cytoplasm of luteal cells have yellow granules called lutein which secrete the hormone progesterone to maintain pregnancy if fertilisation takes place. In the absence of fertilisation, corpus luteum degenerates and forms corpus albicans and there is decrease in progesterone level as well.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286519
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason :Middle piece contains spiral row of mitochondria.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) Head of a sperm has acrosome but the spiral row of mitochondria are present in the mid (connecting) piece of the sperm.
NCERT Page-48/N N-32
Human Reproduction(NCERT)
286520
Assertion : Testicular lobules are the compartments present in testis.
Reason : These lobules are involved in the process of fertilisation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Testicular lobules, the compartments present in the testes, are not involved in the process of fertilisation as whole. Fusion of male and female gametes is called fertilisation.
NCERT Page-43 / N-27
Human Reproduction(NCERT)
286521
Assertion: Placenta is an endocrine Tissue.
Reason: It secretes many hormones during pregnancy.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d) Placenta is an endocrine gland that is present only during pregnancy. It is responsible for production of various hormones like human chorionic gonadotropin (hCG), oestrogen, progesterone, human placental lactogen (hPL).
286517
Assertion : During fertilisation, acrosome help the sperm enter into the cytoplasm through zona pellucida. Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Fertilisation is the fusion of male and female gametes to form zygote. During fertilisation, only head of the sperm enters the egg. After that polyspermy is avoided by fertilisation membrane.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286518
Assertion : Corpus luteum degenerates in the absence of fertilisation.
Reason : Progesterone level decreases.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) In female, Graafian follicle forms corpus luteum after ovulation. The cells of corpus luteum are called luteal cells. The cytoplasm of luteal cells have yellow granules called lutein which secrete the hormone progesterone to maintain pregnancy if fertilisation takes place. In the absence of fertilisation, corpus luteum degenerates and forms corpus albicans and there is decrease in progesterone level as well.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286519
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason :Middle piece contains spiral row of mitochondria.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) Head of a sperm has acrosome but the spiral row of mitochondria are present in the mid (connecting) piece of the sperm.
NCERT Page-48/N N-32
Human Reproduction(NCERT)
286520
Assertion : Testicular lobules are the compartments present in testis.
Reason : These lobules are involved in the process of fertilisation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b) Testicular lobules, the compartments present in the testes, are not involved in the process of fertilisation as whole. Fusion of male and female gametes is called fertilisation.
NCERT Page-43 / N-27
Human Reproduction(NCERT)
286521
Assertion: Placenta is an endocrine Tissue.
Reason: It secretes many hormones during pregnancy.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d) Placenta is an endocrine gland that is present only during pregnancy. It is responsible for production of various hormones like human chorionic gonadotropin (hCG), oestrogen, progesterone, human placental lactogen (hPL).