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Assertion (A): In adult animals, certain cells like heart cells do not undergo mitotic division and enter a quiescent stage.
Reason (R): Cells in the quiescent stage (G0) remain metabolically active but do not proliferate unless necessary.
 
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c)
    If Assertion is true but Reason is false
  • d)
    If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Assertion (A): In adult animals, certain cells like heart cells do not...
Understanding the Assertion and Reason
The question assesses the relationship between the assertion regarding cell division in adult animals and the role of cells in the quiescent stage (G0).
Assertion (A)
- Adult animals have certain cells (like heart cells) that do not undergo mitotic division.
- These cells enter a quiescent stage, meaning they are not actively dividing.
Reason (R)
- Cells in the quiescent stage (G0) remain metabolically active.
- They do not proliferate unless necessary, indicating that they can re-enter the cell cycle if conditions demand.
Analysis of the Relationship
- Both the assertion and the reason are true.
- Heart cells, for example, are known to have a very limited capacity for division after maturity, which fits the description in the assertion.
- The reason accurately explains why these cells remain in a quiescent state: they are active and functional yet do not proliferate unless specific signals trigger them to do so.
Conclusion
- Thus, the correct answer is option 'A': both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
- This understanding is crucial in fields like developmental biology and regenerative medicine, highlighting the balance between cell growth and maintenance in adult tissues.
This combination of the assertion and reason reinforces the concepts of cell cycle regulation and the unique characteristics of differentiated cells in adult organisms.
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Community Answer
Assertion (A): In adult animals, certain cells like heart cells do not...
 
  • The Assertion is true because it correctly states that certain adult animal cells, such as heart cells, do not divide and enter a quiescent stage.
  • The Reason is also true as it accurately describes the nature of cells in the G0 phase, indicating they are metabolically active but not proliferative.
  • Furthermore, the Reason correctly explains the Assertion by providing the functional context of why these cells do not divide.
 
Topic in NCERT: CELL CYCLE AND CELL DIVISION
Line in NCERT: "Some cells in the adult animals do not appear to exhibit division (e.g., heart cells) and many other cells divide only occasionally, as needed to replace cells that have been lost because of injury or cell death. These cells that do not divide further exit G₁ phase to enter an inactive stage called quiescent stage (G) of the cell cycle. Cells in this stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of the organism."
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Assertion (A): In adult animals, certain cells like heart cells do not undergo mitotic division and enter a quiescent stage.Reason (R): Cells in the quiescent stage (G0) remain metabolically active but do not proliferate unless necessary.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'A'. Can you explain this answer?
Question Description
Assertion (A): In adult animals, certain cells like heart cells do not undergo mitotic division and enter a quiescent stage.Reason (R): Cells in the quiescent stage (G0) remain metabolically active but do not proliferate unless necessary.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'A'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Assertion (A): In adult animals, certain cells like heart cells do not undergo mitotic division and enter a quiescent stage.Reason (R): Cells in the quiescent stage (G0) remain metabolically active but do not proliferate unless necessary.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): In adult animals, certain cells like heart cells do not undergo mitotic division and enter a quiescent stage.Reason (R): Cells in the quiescent stage (G0) remain metabolically active but do not proliferate unless necessary.a)If both Assertion and Reason are true and Reason is the correct explanation of Assertionb)If both Assertion and Reason are true but Reason is not the correct explanation of Assertionc)If Assertion is true but Reason is falsed)If both Assertion and Reason are falseCorrect answer is option 'A'. Can you explain this answer?.
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