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Human Reproduction

Multiple Choice Questions

71.

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

Chorion
Allantois
Yolk sac
Amnion

72.

Prothallus of the fern produces

Spores
Gametes
Both (a) and (b)
Cones

73.

In human, during fertilization, a sperm firstly comes in contact with which layer of the ovum

Zona pellucida
Vitelline membrane
Jelly coat
Zona radiata

74.
Due to alcohol abuse, brain-related disease Korsakkoff’s syndrome occurs. Which nutrient is responsible for this syndrome?

Vitamin-B₁₂

Fat

Protein

Vitamin-B₁

Vitamin-B₁

Alcohol interferes with the metabolism of thiamine in the liver. Thus, alcohol intake with deficiency of vitamin B is the basis of brain related diseases called Wernicke's syndrome and Korsakoff's syndrome. Both the syndromes are associated with the destruction of cells in brain with the memory loss even of recent events and mental confusion along with the impairment of speech.