Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which term best describes the process of filtration performed by the glomerulus, where substances pass based on pressure rather than specific selection?
The NCERT text explicitly refers to filtration as a 'non-selective process performed by the glomerulus'.
Which of the following processes marks the beginning of spermatogenesis at puberty?
According to the NCERT text, 'In testis, the immature male germ cells (spermatogonia) produce sperms by spermatogenesis that begins at puberty. The spermatogonia ... multiply by mitotic division and increase in numbers.'
What is the ploidy level and chromosome number of a secondary spermatocyte in humans?
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.' Meiosis I is a reduction division, making the cells haploid while reducing the chromosome number.
The process by which spermatids are transformed into spermatozoa is called:
As per the NCERT text, 'The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.'
After spermiogenesis, where do sperm heads become embedded before their final release?
The NCERT states, 'After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.' Sertoli cells provide nutrition and support to developing sperm.
Which of the following statements is true regarding oogenesis?
The NCERT mentions, 'Oogenesis is initiated during the embryonic development stage... no more oogonia are formed and added after birth.' It also states, 'These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes.' Finally, 'A large number of these follicles degenerate during the phase from birth to puberty.'
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.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.