Cleavage is:

(1) Dissolution of the zona pellucida

(2) A specialized mitotic division in late fetus

(3) A specialized meiotic division in late fetus

(4) A specialized mitotic division in zygote and early embryo

 

Subtopic:  Embryonic Development till Gastrulation |
 86%
From NCERT
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Morula is a solid ball of cells during early embryonic development and consists of:

(1) 4 – 8 cells

(2) 8 – 16 cells

(3) 24 – 30 cells

(4) 60 – 72 cells

 

Subtopic:  Embryonic Development till Gastrulation |
 91%
From NCERT
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The fetal body is covered with fine hair, eyelashes separate, and eyelashes are formed by the end of:

(1) 20 weeks

(2) 24 weeks

(3) 28 weeks

(4) 30 weeks

 

Subtopic:  Fetal Development & Parturition |
 83%
From NCERT
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The signals of fetal ejection reflex originate from:

1. Maternal pituitary

2. Maternal hypothalamus

3. Fully developed fetus and placenta

4. Fetal pituitary

 

Subtopic:  Fetal Development & Parturition |
 93%
From NCERT
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To induce uterine contractions for parturition which of the following hormones can be injected to the female?

(1) hCG

(2) Estrogen

(3) Progesterone

(4) Oxytocin

Subtopic:  Fetal Development & Parturition |
 94%
From NCERT
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In humans, the sex of the baby is determined:

1. At the time of fertilization and by the father

2. At the time of fertilization and by the mother

3. At the time of implantation and by the father

4. At the time of implantation and by the mother

Subtopic:  Sex Determination in Humans |
 82%
From NCERT
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What happens when a sperm enters the cytoplasm of the secondary oocyte?

(1) Release of first polar body

(2) Completion of meiosis II

(3) Degeneration of polar bodies

(4) Dissolution of zona pellucida

 

Subtopic:  Fertilization: Part 2 | Fertilization |
 83%
From NCERT
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Consider the following two statements:
I. Not all copulations lead to fertilization and pregnancy
II. Fertilization can occur if the ovum and the sperms are simultaneously transported to the fallopian tubes.
1. Both I and II are correct and II correctly explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct

Subtopic:  Fertilization: Part 2 | Fertilization |
 81%
From NCERT
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Corpus luteum secretes large amounts of:

(1) LH

(2) FSH

(3) Progesterone

(4) Estrogen

 

Subtopic:  Menstrual Cycle: Luteal Phase |
 92%
From NCERT
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LH surge:

1. is a dramatic sudden increase in the levels of LH during the early part of menstrual cycle and is responsible for ovulation.

2. Is a dramatic sudden decrease in the levels of LH during the early part of menstrual cycle and is responsible for ovulation.

3 is a dramatic sudden decrease in the levels of LH during the mid-menstrual cycle and is responsible for ovulation.

4. is a dramatic sudden increase in the levels of LH during the mid-menstrual cycle and is responsible for ovulation.

 

Subtopic:  Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase |
 78%
From NCERT
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