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Q120 (CDS-I/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Atomic and nuclear physics Answer Verified

Which of the following statements about ‘fission’ is correct ? 1. It is related with the creation of new individuals by means of cell division in unicellular organism. 2. It is related with the transformation of heavier nuclei into smaller nuclei. 3. It is related with the creation of a heavier nuclei by means of combining two higher nuclei. Select the correct answer using the code given below :

Result
Your answer: —  ·  Correct: C
Explanation

The term 'fission' is used in both biological and physical contexts. In biology, fission refers to a form of asexual reproduction in unicellular organisms, such as bacteria and protozoa, where cell division leads to the creation of new individuals [3]. This process, often called binary fission, involves the parent cell splitting into two or more daughter cells [1]. In physics, nuclear fission is a reaction where a heavy, unstable nucleus (like Uranium-235) is transformed into two or more smaller, lighter nuclei, releasing a significant amount of energy. Statement 3 is incorrect because the process of combining two light nuclei to form a heavier nucleus is defined as nuclear fusion, not fission. Therefore, statements 1 and 2 correctly describe the biological and physical applications of fission respectively.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 7: How do Organisms Reproduce? > 7.2.1 Fission > p. 115
  2. [3] https://en.wikipedia.org/wiki/Fission_(biology)
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SIMILAR QUESTIONS

IAS · 2001 · Q106 Relevance score: 0.54

Consider the following statements : In a nuclear reactor, self-sustained chain reaction is possible, because I. more neutrons are released in each of the fission reactions. II. the neutrons immediately take part in the fission process. III. the fast neutrons are slowed down by Graphite. IV. every neutron realeased in the fission reaction initiates further fission. Which of these statements are correct ?

IAS · 2005 · Q34 Relevance score: -1.01

Assertion (A) : Amoeba is reproduced by fission. Reason (R) : All unicellular organisms are reproduced by asexual methods.

CAPF · 2010 · Q72 Relevance score: -1.78

Statement I : Heavy water is used as moderator in nuclear reactor. Statement I : Thermal neutrons are used for fission reaction in a reactor.

IAS · 2012 · Q41 Relevance score: -1.98

With reference to ‘stem cells’, frequently in the news, which of the following statements is/are correct? 1. Stem cells can be derived from mammals only. 2. Stem cells can be used for screening new drugs. 3. Stem cells can be used for medical therapies. Select the correct answer using the codes given below :

NDA-I · 2011 · Q47 Relevance score: -2.03

Which one among the following statements regarding cell is not correct ?