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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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 |
 85%
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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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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Which hormone is mainly secreted by the developing follicles during the proliferative phase of the menstrual cycle?

(1) LH

(2) FSH

(3) Progesterone

(4) Estrogen

 

Subtopic:  Menstrual Cycle: Pre Ovulatory Phase |
 59%
From NCERT
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What is released at ovulation?

(1) Primary oocyte arrested at meiosis I

(2) Primary oocyte arrested at meiosis II

(3) Secondary oocyte arrested at meiosis I

(4) Secondary oocyte arrested at meiosis II

 

Subtopic:  Ovary |
 55%
From NCERT
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At the birth of the female child, the follicles in her ovaries contain:

(1) Primary oocytes that have been arrested at the S phase of the cell cycle

(2) Primary oocytes that have been arrested at the Prophase I of Meiosis I

(3) Secondary oocytes that have been arrested at the Prophase I of Meiosis I

(4) Secondary oocytes that have been arrested at the Metaphase II of Meiosis II

 

Subtopic:  Ovary |
 86%
From NCERT
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FSH:

1. Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis

2. Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis

3. Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis

4. Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis

Subtopic:  Seminiferous Tubules & Spermatogenesis |
 80%
From NCERT
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Ovaries are the primary sex organs in human females because they:
I. Produce the female gamete
II. Produce the hormone that regulates the development of secondary sexual characters
1. Both I and II
2. Only I
3. Only II
4. None

Subtopic:  Ovary |
 87%
From NCERT
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