Chromosomes, Cell Cycle & Division Quiz - ICSE Class 10 Biology
Free practice quiz: Chromosomes, Cell Cycle & Division (ICSE Class 10 Biology). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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During which phase of the cell cycle does DNA replication occur?
- G1 phase
- S phase
- G2 phase
- M phase
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Answer: B. S phase
DNA replication, the process of duplicating the cell's genetic material, is the defining event of the S (synthesis) phase of the cell cycle.
Which phase of the cell cycle is characterized by cell growth and preparation for DNA replication?
- G1 phase
- S phase
- G2 phase
- M phase
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Answer: A. G1 phase
The G1 (Gap 1) phase is the first growth phase of the cell cycle, where the cell increases in size and synthesizes proteins and organelles in preparation for DNA replication.
A chromosome consisting of a single chromatid is said to be:
- Duplicated
- Unduplicated
- Polyploid
- Aneuploid
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Answer: B. Unduplicated
A chromosome typically consists of two identical sister chromatids joined at the centromere after DNA replication. An unduplicated chromosome has only a single chromatid.
Which event signifies the end of meiosis I and the beginning of meiosis II?
- Separation of sister chromatids
- Pairing of homologous chromosomes
- Formation of two haploid cells
- Replication of DNA
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Answer: C. Formation of two haploid cells
Meiosis I concludes with the formation of two haploid cells, each containing one chromosome from each homologous pair. These cells then proceed to meiosis II.
If a cell has 2n = 16 chromosomes, how many chromosomes will be present in a cell after meiosis?
- 8
- 16
- 32
- 4
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Answer: A. 8
Meiosis reduces the chromosome number by half. If a diploid cell has 16 chromosomes (2n=16), then after meiosis, the resulting haploid cells will have 8 chromosomes (n=8).