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Science Olympiad (NSO) Olympiad Biology — practice questions

Explore 30 free Olympiad Biology questions in Science Olympiad (NSO) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Olympiad Biology questions and exercises with answers

Showing questions 1–30 of 30.

A typical human cell in culture completes one full cell cycle in about:Read the answer and worked solution →Yeast can run through its entire cell cycle in as little as:Read the answer and worked solution →The long stage between two successive cell divisions is called:Read the answer and worked solution →Interphase is divided into how many further phases?Read the answer and worked solution →During the S phase of interphase, the cell copies its:Read the answer and worked solution →Even after DNA replication in the S phase, the chromosome number stays:Read the answer and worked solution →A cell that leaves the cycle and stops dividing enters the stage called:Read the answer and worked solution →In animals, mitotic division normally occurs only in cells that are:Read the answer and worked solution →Mitosis is also called equational division because the daughter cells keep the:Read the answer and worked solution →The first stage of mitotic karyokinesis, following the G2 phase, is:Read the answer and worked solution →At prophase, each chromosome is seen to be made of two chromatids joined at the:Read the answer and worked solution →The stage at which all chromosomes line up at the equator of the cell is:Read the answer and worked solution →Spindle fibres attach to a structure on each chromatid called the:Read the answer and worked solution →The stage in which centromeres split and chromatids move apart is:Read the answer and worked solution →The final stage of mitosis, when chromosomes cluster at the poles, is:Read the answer and worked solution →The division of the cytoplasm that follows nuclear division is called:Read the answer and worked solution →Meiosis exists so that a life cycle can produce cells that are:Read the answer and worked solution →Meiosis involves two cycles of nuclear division but how many cycles of DNA replication?Read the answer and worked solution →At the end of meiosis II, the number of haploid cells produced is:Read the answer and worked solution →Prophase I of meiosis is divided into five sub stages beginning with:Read the answer and worked solution →A pair of synapsed homologous chromosomes is called a bivalent or a:Read the answer and worked solution →The X shaped points where crossing over has occurred between homologues are:Read the answer and worked solution →Catch the mitosis stagesRead the answer and worked solution →Pop the interphase partsRead the answer and worked solution →Run the division gatesRead the answer and worked solution →Slice the division wordsRead the answer and worked solution →Mitosis or meiosisRead the answer and worked solution →Sort the cell cycle termsRead the answer and worked solution →Type the numberRead the answer and worked solution →Cell division bingoRead the answer and worked solution →

Worked practice questions

A typical human cell in culture completes one full cell cycle in about:

  1. 24 hours
  2. 12 hours
  3. 48 hours
  4. 72 hours
Show answer and solution

Correct answer: A. 24 hours

1. Different cells take different times to divide. 2. A human cell in culture is timed in the account. 3. It takes about 24 hours. _Source: syllabus Biology Class XI, Chapter 10, Cell Cycle and Cell Division._

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Yeast can run through its entire cell cycle in as little as:

  1. 20 minutes
  2. 90 minutes
  3. 30 minutes
  4. 60 minutes
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Correct answer: B. 90 minutes

1. Yeast divides far faster than a human cell. 2. Its cycle time is given in minutes. 3. That time is 90 minutes. _Source: syllabus Biology Class XI, Chapter 10, Cell Cycle and Cell Division._

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The long stage between two successive cell divisions is called:

  1. Interphase
  2. Interlude
  3. Interval
  4. Interface
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Correct answer: A. Interphase

1. Division itself takes only a short part of the cycle. 2. The rest is spent preparing. 3. That stage is interphase. _Source: syllabus Biology Class XI, Chapter 10, Cell Cycle and Cell Division._

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More Biology topics

BiologyOlympiad ScienceCell Cycle and Cell DivisionComponents of FoodNutrition in Plants