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Human Reproduction · Question 79

AIPMT 2010 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

In human female the blastocyst

  1. gets implanted into uterus 3 days after ovulation
  2. gets nutrition from uterine endometrial secretion only after implantation
  3. gets implanted in endometrium by the trophoblast cells
  4. forms placenta even before implantation

Answer

(3) gets implanted in endometrium by the trophoblast cells

Solution

As per NCERT, the blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells called the inner cell mass.

⇒ The trophoblast layer gets attached to the endometrium and the inner cell mass differentiates as the embryo.

⇒ After attachment, the uterine cells divide rapidly and cover the blastocyst; the blastocyst becomes embedded in the endometrium (implantation).

∵ Implantation occurs about a week after fertilisation and the placenta forms only after implantation, options (1) and (4) are wrong.

Answer: (3)

AIPMT 2010 (Mains)

Keep practising — Human Reproduction

2

Secretions from which one of the following are rich in fructose, calcium and some enzymes?

  1. Liver
  2. Pancreas
  3. Salivary glands
  4. Male accessory glands
AIPMT 2010 (Mains)
3

Sertoli cells are found in :

  1. ovaries and secrete progesterone
  2. adrenal cortex and secrete adrenaline
  3. seminiferous tubules and provide nutrition to germ cells
  4. pancreas and secrete cholecystokinin
AIPMT 2010 (Prelims)
4

Vasa efferentia are the ductules leading from :

  1. Testicular lobules to rete testis
  2. Rete testis to vas deferens
  3. Vas deferens to epididymis
  4. Epididymis to urethra
AIPMT 2010 (Prelims)
5

Seminal plasma in human males is rich in

  1. fructose and calcium
  2. glucose and calcium
  3. DNA and testosterone
  4. ribose and potassium
AIPMT 2010 (Prelims)
6

The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

  1. Fourth month
  2. Fifth month
  3. Sixth month
  4. Third month
AIPMT 2010 (Prelims)
7

The second maturation division of the mammalian ovum occurs

  1. Shortly after ovulation before the ovum makes entry into the Fallopian tube
  2. Until after the ovum has been penetrated by a sperm
  3. Until the nucleus of the sperm has fused with that of the ovum
  4. in the Graafian follicle following the first maturation division
AIPMT 2010 (Prelims)
8

Which one of the following statements about human sperm is correct?

  1. Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
  2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
  3. Acrosome serves as a sensory structure leading the sperm towards the ovum
  4. Acrosome serves no particular function
AIPMT 2010 (Prelims)
9

Which one of the following statements about morula in humans is correct?

  1. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
  2. It has far less cytoplasm as well as less DNA than in an uncleaved zygote
  3. It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
  4. It has more cytoplasm and more DNA than an uncleaved zygote
AIPMT 2010 (Prelims)
10

The part of Fallopian tube closest to the ovary is

  1. Isthmus
  2. Infundibulum
  3. Cervix
  4. Ampulla
AIPMT 2010 (Prelims)
11

Seminal plasma in humans is rich in :

  1. Fructose, calcium and certain enzymes
  2. Fructose and certain enzymes but poor calcium
  3. Glucose and certain enzymes but has no calcium
  4. Fructose and calcium but has no enzyme
AIPMT 2009

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