Fertilisation and Implantation
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Human Reproduction(NCERT)

286478 Which of the following is the first change that occurs to the zygote after fertilization?

1 It divides to form a hollow ball of cells, called the blastocyst.
2 It begins to secrete the hormones.
3 It contacts the endometrial wall of the uterus and becomes buried inside it.
4 It initiates the formation of a placenta.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)

286479 Presence of $XX$ or $XY$ chromosomes in zygote depends on

1 the sperm carrying $X$ chromosome fertilized the ovum.
2 the sperm carrying $Y$ chromosome fertilized the ovum.
3 the sperm without any chromosome fertilized the ovum.
4 the sperm carrying $X$ or $Y$ chromosomes fertilized the ovum.
NCERT Page-52 / N-36
Human Reproduction(NCERT)

286480 In the given figure the structure of ovum is surrounded by few sperms and some art are labelled as A, B, C and D.


Which of the following options shows the correct labelling?

1 A $\to $ Zona pellucida; B $\to $ Ovuin'; $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
2 $\text{A}\to $ Perivitelline space, $\text{B}\to $ Antrum, $\text{C}\to $ Zona pellucida $D\to $ Ovum
3 A $\to $ Zona pellucida, $\text{B}\to $ Ootid, $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
4 $\text{A}\to $ Cells of corona radiata, $\text{B}\to $ Morula, $C\to $ Perivitelline space, $D\to $ Zona pellucida
NCERT Page-51 / N-35
Human Reproduction(NCERT)

286481 Which layer of blastocysts gets attached to the endometrium?

1 Trophoblast
2 Inner cell mass
3 Umbilical cord
4 Both (a.)and (c.)
NCERT Page-53 / N-36
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Human Reproduction(NCERT)

286478 Which of the following is the first change that occurs to the zygote after fertilization?

1 It divides to form a hollow ball of cells, called the blastocyst.
2 It begins to secrete the hormones.
3 It contacts the endometrial wall of the uterus and becomes buried inside it.
4 It initiates the formation of a placenta.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)

286479 Presence of $XX$ or $XY$ chromosomes in zygote depends on

1 the sperm carrying $X$ chromosome fertilized the ovum.
2 the sperm carrying $Y$ chromosome fertilized the ovum.
3 the sperm without any chromosome fertilized the ovum.
4 the sperm carrying $X$ or $Y$ chromosomes fertilized the ovum.
NCERT Page-52 / N-36
Human Reproduction(NCERT)

286480 In the given figure the structure of ovum is surrounded by few sperms and some art are labelled as A, B, C and D.


Which of the following options shows the correct labelling?

1 A $\to $ Zona pellucida; B $\to $ Ovuin'; $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
2 $\text{A}\to $ Perivitelline space, $\text{B}\to $ Antrum, $\text{C}\to $ Zona pellucida $D\to $ Ovum
3 A $\to $ Zona pellucida, $\text{B}\to $ Ootid, $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
4 $\text{A}\to $ Cells of corona radiata, $\text{B}\to $ Morula, $C\to $ Perivitelline space, $D\to $ Zona pellucida
NCERT Page-51 / N-35
Human Reproduction(NCERT)

286481 Which layer of blastocysts gets attached to the endometrium?

1 Trophoblast
2 Inner cell mass
3 Umbilical cord
4 Both (a.)and (c.)
NCERT Page-53 / N-36
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Human Reproduction(NCERT)

286478 Which of the following is the first change that occurs to the zygote after fertilization?

1 It divides to form a hollow ball of cells, called the blastocyst.
2 It begins to secrete the hormones.
3 It contacts the endometrial wall of the uterus and becomes buried inside it.
4 It initiates the formation of a placenta.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)

286479 Presence of $XX$ or $XY$ chromosomes in zygote depends on

1 the sperm carrying $X$ chromosome fertilized the ovum.
2 the sperm carrying $Y$ chromosome fertilized the ovum.
3 the sperm without any chromosome fertilized the ovum.
4 the sperm carrying $X$ or $Y$ chromosomes fertilized the ovum.
NCERT Page-52 / N-36
Human Reproduction(NCERT)

286480 In the given figure the structure of ovum is surrounded by few sperms and some art are labelled as A, B, C and D.


Which of the following options shows the correct labelling?

1 A $\to $ Zona pellucida; B $\to $ Ovuin'; $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
2 $\text{A}\to $ Perivitelline space, $\text{B}\to $ Antrum, $\text{C}\to $ Zona pellucida $D\to $ Ovum
3 A $\to $ Zona pellucida, $\text{B}\to $ Ootid, $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
4 $\text{A}\to $ Cells of corona radiata, $\text{B}\to $ Morula, $C\to $ Perivitelline space, $D\to $ Zona pellucida
NCERT Page-51 / N-35
Human Reproduction(NCERT)

286481 Which layer of blastocysts gets attached to the endometrium?

1 Trophoblast
2 Inner cell mass
3 Umbilical cord
4 Both (a.)and (c.)
NCERT Page-53 / N-36
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Human Reproduction(NCERT)

286478 Which of the following is the first change that occurs to the zygote after fertilization?

1 It divides to form a hollow ball of cells, called the blastocyst.
2 It begins to secrete the hormones.
3 It contacts the endometrial wall of the uterus and becomes buried inside it.
4 It initiates the formation of a placenta.
NCERT Page-52 & 53 / N-35
Human Reproduction(NCERT)

286479 Presence of $XX$ or $XY$ chromosomes in zygote depends on

1 the sperm carrying $X$ chromosome fertilized the ovum.
2 the sperm carrying $Y$ chromosome fertilized the ovum.
3 the sperm without any chromosome fertilized the ovum.
4 the sperm carrying $X$ or $Y$ chromosomes fertilized the ovum.
NCERT Page-52 / N-36
Human Reproduction(NCERT)

286480 In the given figure the structure of ovum is surrounded by few sperms and some art are labelled as A, B, C and D.


Which of the following options shows the correct labelling?

1 A $\to $ Zona pellucida; B $\to $ Ovuin'; $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
2 $\text{A}\to $ Perivitelline space, $\text{B}\to $ Antrum, $\text{C}\to $ Zona pellucida $D\to $ Ovum
3 A $\to $ Zona pellucida, $\text{B}\to $ Ootid, $\text{C}\to $ Cells of corona radiata, $D\to $ Perivitelline space
4 $\text{A}\to $ Cells of corona radiata, $\text{B}\to $ Morula, $C\to $ Perivitelline space, $D\to $ Zona pellucida
NCERT Page-51 / N-35
Human Reproduction(NCERT)

286481 Which layer of blastocysts gets attached to the endometrium?

1 Trophoblast
2 Inner cell mass
3 Umbilical cord
4 Both (a.)and (c.)
NCERT Page-53 / N-36
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