Haploidy & Cell Division in Organisms — NEET Biology
📚 Practice ConceptDiscuss with your teacher about (i) haploid insects and lower plants where cell-division occurs, and (ii) some haploid cells in higher plants where cell-division does not occur.
Consider the following statements about cell cycle and cell division: 1. In human cells, the average duration of cell cycle is about 24 hours, whereas in yeast it may be completed in only about 90 minutes. 2. During S-phase, the amount of DNA doubles (from 2C to 4C), but the number of chromosomes remains unchanged. 3. In metaphase, chromosomes are aligned at the equatorial plate, with spindle fibres attached to kinetochores of both sister chromatids. 4. Anaphase I of meiosis is characterised by separation of sister chromatids. 5. Mitosis is generally restricted to diploid cells in animals, while plants can undergo mitotic divisions in both haploid and diploid cells. Which of the above statements are correct?
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Correct answer: D — 1, 2, 3, and 5 only
Statement 1 : Human cells take ~24 hours, yeast ~90 minutes. Statement 2 : DNA content doubles from 2C to 4C, but chromosome number remains the same. Statement 3 : At metaphase, chromosomes align at the equatorial plate and kinetochores attach spindle fibres from opposite poles. Statement 4 : In Anaphase I, homologous chromosomes separate; sister chromatids remain together. Statement 5 : Mitotic division is restricted to diploid cells in animals, but plants can undergo mitosis in haploid and diploid cells.
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.