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What is the function of the acrosome in a human sperm?
The NCERT text describes the sperm head: 'The anterior portion of which is covered by a cap-like structure, acrosome. The acrosome is filled with enzymes that help fertilisation of the ovum.'
During human spermatogenesis, a primary spermatocyte undergoes Meiosis I to produce:
The NCERT states, 'A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each.'
Which cell type provides nutrition to the dividing germ cells during spermatogenesis?
The NCERT states, 'Each seminiferous tubule is lined inside by spermatogonia and Sertoli cells. The spermatogonia undergo meiotic divisions leading to sperm formation, while Sertoli cells provide nutrition to the dividing germ cells.'
In human males, at least what percentage of sperms must show vigorous motility for normal fertility?
The NCERT mentions, 'The human male ejaculates about 200 to 300 million sperms during a coitus of which, for normal fertility, at least 60 per cent sperms must have normal shape and size and at least 40 per cent of them must show vigorous motility.'
What happens to the number of primary follicles in a human female from birth to puberty?
The NCERT explicitly states, 'A large number of these follicles degenerate during the phase from birth to puberty. Therefore, at puberty only 60,000-80,000 primary follicles are left in each ovary.'
Which of the following components of seminal plasma are essential for the maturation and motility of sperms?
The NCERT states, 'Sperms released from the seminiferous tubules, are transported by the accessory ducts. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms.'
Human gametes are ______ and the zygote is ______.
From the exercise fill-in-the-blanks, it's clarified that 'Male and female gametes are haploid' and 'Zygote is diploid'.
Gametogenesis refers to the formation of:
The general introduction to human reproduction states: 'The reproductive events in humans include formation of gametes (gametogenesis), i.e., sperms in males and ovum in females'.
What is the chromosome number of a human primary spermatocyte?
The NCERT states, 'Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis.' A diploid cell is represented as $2n$, with 46 chromosomes in humans.
Which of the following statements about the electrophilic aromatic substitution of phenol is INCORRECT?
According to the NCERT text, 'The –OH group attached to the benzene ring activates it towards electrophilic substitution. Also, it directs the incoming group to ortho and para positions in the ring as these positions become electron rich due to the resonance effect caused by –OH group.' Therefore, directing to meta positions is incorrect.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.