286474
At the time of fertilization, chromosome number
1 is halved
2 remains haploid
3 becomes diploid
4 does not change
Explanation:
(c) Fertilization through the process of the fusion of haploid male and female gametes, ensures the restoration of the diploidy of the human foetus.
NCERT Page-52 / N-36
Human Reproduction(NCERT)
286475
Fertilization can only occurs if
1 sperm reaches to the ampullary - isthmic junction before the ovum.
2 ovum reaches to the ampullary - isthmic junction before the sperm.
3 sperms are transported to the uterus and ovum to the fallopian tube simultaneously.
4 sperm and ovum are transported simultaneously to the ampullary - isthmic junction.
Explanation:
(d) The ampullary-isthmus junction is the particular place where actually fertilization occurs. This is the crucial place for the fertilization because the ovum released by the ovary is transported to the ampullary-isthmic junction.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286476
Which of the following does not occur in the time during and immediately following fertilization?
1 Fusion of the sperm and ovum nuclei.
2 Division of the oocyte cell by meiosis
3 Implantation of the ovum in the uterus.
4 Digestion of cell layers around the oocyte by sperm.
Explanation:
(c) Implantation is not the immediate process. It takes 5 days to occur after fertilization.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)
286477
What happens during fertilization in humans after many sperms reach close to the ovum?
1 Cells of corona radiata trap all the sperms except one
2 Only the closest sperm to the ovum penetrates the zona pellucida.
3 Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida and plasma membrane.
4 All sperms except the one nearest to the ovum lose their tails
Explanation:
(c) During fertilization in humans, when many sperms reach close to the ovum, the secretion of acrosome helps the sperm to enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division of the secondary oocyte.
286474
At the time of fertilization, chromosome number
1 is halved
2 remains haploid
3 becomes diploid
4 does not change
Explanation:
(c) Fertilization through the process of the fusion of haploid male and female gametes, ensures the restoration of the diploidy of the human foetus.
NCERT Page-52 / N-36
Human Reproduction(NCERT)
286475
Fertilization can only occurs if
1 sperm reaches to the ampullary - isthmic junction before the ovum.
2 ovum reaches to the ampullary - isthmic junction before the sperm.
3 sperms are transported to the uterus and ovum to the fallopian tube simultaneously.
4 sperm and ovum are transported simultaneously to the ampullary - isthmic junction.
Explanation:
(d) The ampullary-isthmus junction is the particular place where actually fertilization occurs. This is the crucial place for the fertilization because the ovum released by the ovary is transported to the ampullary-isthmic junction.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286476
Which of the following does not occur in the time during and immediately following fertilization?
1 Fusion of the sperm and ovum nuclei.
2 Division of the oocyte cell by meiosis
3 Implantation of the ovum in the uterus.
4 Digestion of cell layers around the oocyte by sperm.
Explanation:
(c) Implantation is not the immediate process. It takes 5 days to occur after fertilization.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)
286477
What happens during fertilization in humans after many sperms reach close to the ovum?
1 Cells of corona radiata trap all the sperms except one
2 Only the closest sperm to the ovum penetrates the zona pellucida.
3 Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida and plasma membrane.
4 All sperms except the one nearest to the ovum lose their tails
Explanation:
(c) During fertilization in humans, when many sperms reach close to the ovum, the secretion of acrosome helps the sperm to enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division of the secondary oocyte.
286474
At the time of fertilization, chromosome number
1 is halved
2 remains haploid
3 becomes diploid
4 does not change
Explanation:
(c) Fertilization through the process of the fusion of haploid male and female gametes, ensures the restoration of the diploidy of the human foetus.
NCERT Page-52 / N-36
Human Reproduction(NCERT)
286475
Fertilization can only occurs if
1 sperm reaches to the ampullary - isthmic junction before the ovum.
2 ovum reaches to the ampullary - isthmic junction before the sperm.
3 sperms are transported to the uterus and ovum to the fallopian tube simultaneously.
4 sperm and ovum are transported simultaneously to the ampullary - isthmic junction.
Explanation:
(d) The ampullary-isthmus junction is the particular place where actually fertilization occurs. This is the crucial place for the fertilization because the ovum released by the ovary is transported to the ampullary-isthmic junction.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286476
Which of the following does not occur in the time during and immediately following fertilization?
1 Fusion of the sperm and ovum nuclei.
2 Division of the oocyte cell by meiosis
3 Implantation of the ovum in the uterus.
4 Digestion of cell layers around the oocyte by sperm.
Explanation:
(c) Implantation is not the immediate process. It takes 5 days to occur after fertilization.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)
286477
What happens during fertilization in humans after many sperms reach close to the ovum?
1 Cells of corona radiata trap all the sperms except one
2 Only the closest sperm to the ovum penetrates the zona pellucida.
3 Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida and plasma membrane.
4 All sperms except the one nearest to the ovum lose their tails
Explanation:
(c) During fertilization in humans, when many sperms reach close to the ovum, the secretion of acrosome helps the sperm to enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division of the secondary oocyte.
286474
At the time of fertilization, chromosome number
1 is halved
2 remains haploid
3 becomes diploid
4 does not change
Explanation:
(c) Fertilization through the process of the fusion of haploid male and female gametes, ensures the restoration of the diploidy of the human foetus.
NCERT Page-52 / N-36
Human Reproduction(NCERT)
286475
Fertilization can only occurs if
1 sperm reaches to the ampullary - isthmic junction before the ovum.
2 ovum reaches to the ampullary - isthmic junction before the sperm.
3 sperms are transported to the uterus and ovum to the fallopian tube simultaneously.
4 sperm and ovum are transported simultaneously to the ampullary - isthmic junction.
Explanation:
(d) The ampullary-isthmus junction is the particular place where actually fertilization occurs. This is the crucial place for the fertilization because the ovum released by the ovary is transported to the ampullary-isthmic junction.
NCERT Page-51 / N-35
Human Reproduction(NCERT)
286476
Which of the following does not occur in the time during and immediately following fertilization?
1 Fusion of the sperm and ovum nuclei.
2 Division of the oocyte cell by meiosis
3 Implantation of the ovum in the uterus.
4 Digestion of cell layers around the oocyte by sperm.
Explanation:
(c) Implantation is not the immediate process. It takes 5 days to occur after fertilization.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)
286477
What happens during fertilization in humans after many sperms reach close to the ovum?
1 Cells of corona radiata trap all the sperms except one
2 Only the closest sperm to the ovum penetrates the zona pellucida.
3 Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida and plasma membrane.
4 All sperms except the one nearest to the ovum lose their tails
Explanation:
(c) During fertilization in humans, when many sperms reach close to the ovum, the secretion of acrosome helps the sperm to enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division of the secondary oocyte.
