In the absence of fertilization, corpus luteum:

1. Stops secreting progesterone but increases the secretion of estrogen

2. Stops secreting estrogen but increases the secretion of progesterone

3. Increases the secretion of both progesterone and estrogen

4. Degenerates

Subtopic:  Menstrual Cycle: Luteal Phase |
 85%
From NCERT
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What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome

Subtopic:  Fertilization: Part 2 | Fertilization |
 83%
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 |
 91%
From NCERT
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During pregnancy the levels of thyroxin:

1. Increase several folds in maternal blood

2. Increases several folds in fetal blood

3. Decreases several folds in maternal blood

4. Decreases several folds in fetal blood

Subtopic:  Fetal Development & Parturition |
 92%
From NCERT
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The first movements of the fetus and the appearance of hair on the head are usually observed during:

1. 2nd month

2. 3rd month

3. 5th month

4. 6th month

Subtopic:  Fetal Development & Parturition |
 87%
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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The milk produced during the initial few days of lactation, called colostrum, is essential for the new born as colostrums contains:

1. Large amount of glucose

2. Anti-infective antibodies

3. Fats

4. Various hormones

Subtopic:  Mammary Gland & Lactation |
 96%
From NCERT
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Which of the following hormones is not secreted by the human placenta?

1. HCG

2. HGH

3. HPL

4. Progesterone

Subtopic:  Implantation : Part 2 | Implantation |
 81%
From NCERT
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Which of the following is secreted only during the luteal phase of a menstrual cycle ?

(1) LH

(2) FSH

(3) Estrogen

(4) Progesterone

Subtopic:  Menstrual Cycle: Luteal Phase |
 72%
From NCERT
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Subtopic:  Ovary |
From NCERT
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