Comprehension

Humans are sexually reproducing and viviparous. The male reproductive system is composed of a pair of testes, the male sex accessory ducts, the accessory glands, and external genitalia. The female reproductive system consists of a pair of ovaries, a pair of oviducts, a uterus, a vagina, external genitalia, and a pair of mammary glands. The reproductive cycle of female primates is called the menstrual cycle. The menstrual cycle starts only after attaining sexual maturation (puberty). Coitus followed by fertilization leads to the formation of a zygote. After 9 months of pregnancy, the fully developed foetus is ready for delivery.

Question: 1

What is the first sign of a growing foetus?

Updated On: Nov 4, 2024
  • Development of limbs and digits
  • Movement of foetus
  • Formation of heart
  • Development of head
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The Correct Option is C

Solution and Explanation

The formation of the heart is one of the earliest signs of fetal development. The heart begins to form and beat early, marking the start of fetal growth and enabling circulation, essential for developing other organs.
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Question: 2

How many chromosomes are present in human primary spermatocytes?

Updated On: Nov 4, 2024
  • 46
  • 23
  • 92
  • 12
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The Correct Option is A

Solution and Explanation

Human primary spermatocytes are diploid (2n) and contain 46 chromosomes. During meiosis, these cells divide to form haploid spermatids with 23 chromosomes each, ensuring genetic diversity.
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Question: 3

The transformation of spermatids into spermatozoa is known as:

Updated On: Nov 4, 2024
  • Spermiation
  • Spermiogenesis
  • Spermatogenesis
  • Spermatogoniasis
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The Correct Option is B

Solution and Explanation

Spermiogenesis is the process by which spermatids mature into spermatozoa, developing tails and other structures necessary for motility and fertilization, completing the process of sperm cell maturation.
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Question: 4

Which hormone is essential for the maintenance of the endometrium during the luteal phase?

Updated On: Nov 4, 2024
  • Luteinising Hormone
  • Relaxin
  • Progesterone
  • Follicle Stimulating Hormone
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The Correct Option is C

Solution and Explanation

Progesterone is vital during the luteal phase to maintain the endometrial lining, preparing it for potential implantation of a fertilized egg. Progesterone also supports early pregnancy if fertilization occurs.
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Question: 5

The nucleus is present in ________ part of the human sperm?

Updated On: Nov 4, 2024
  • Middle piece
  • Acrosome
  • Head
  • Tail
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The Correct Option is C

Solution and Explanation

In human sperm, the nucleus is located in the head, containing the genetic material necessary for fertilization. The acrosome, also in the head, contains enzymes for egg penetration, while the nucleus holds the DNA.
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