Question:
Match the following theories of ageing.
\[
\begin{array}{|l|l|}
\hline
\textbf{Theory} & \textbf{Description} \\
\hline
\text{P. Cellular-Clock Theory} & \text{(iii) Cells are limited in number of times they can reproduce to repair damage} \\
\hline
\text{Q. Wear-and-Tear Theory} & \text{(iv) Body organs and cell tissues wear out with repeated use and abuse} \\
\hline
\text{R. Free-radical Theory} & \text{(i) Oxygen molecule with unstable electron} \\
\hline
\text{S. Activity Theory} & \text{(ii) Elderly person who remains active in some way adjusts more positively to ageing} \\
\hline
\end{array}
\]
Match the following theories of ageing.
\[ \begin{array}{|l|l|} \hline \textbf{Theory} & \textbf{Description} \\ \hline \text{P. Cellular-Clock Theory} & \text{(iii) Cells are limited in number of times they can reproduce to repair damage} \\ \hline \text{Q. Wear-and-Tear Theory} & \text{(iv) Body organs and cell tissues wear out with repeated use and abuse} \\ \hline \text{R. Free-radical Theory} & \text{(i) Oxygen molecule with unstable electron} \\ \hline \text{S. Activity Theory} & \text{(ii) Elderly person who remains active in some way adjusts more positively to ageing} \\ \hline \end{array} \]
\[ \begin{array}{|l|l|} \hline \textbf{Theory} & \textbf{Description} \\ \hline \text{P. Cellular-Clock Theory} & \text{(iii) Cells are limited in number of times they can reproduce to repair damage} \\ \hline \text{Q. Wear-and-Tear Theory} & \text{(iv) Body organs and cell tissues wear out with repeated use and abuse} \\ \hline \text{R. Free-radical Theory} & \text{(i) Oxygen molecule with unstable electron} \\ \hline \text{S. Activity Theory} & \text{(ii) Elderly person who remains active in some way adjusts more positively to ageing} \\ \hline \end{array} \]
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Remember: "Cell life limit" = Cellular-Clock, "Tissue damage" = Wear-and-Tear, "Unstable oxygen" = Free-radical, "Stay active = positive ageing" = Activity Theory.
Updated On: Apr 28, 2025
- P-ii; Q-iv; R-i; S-iii
- P-iv; Q-i; R-iii; S-ii
- P-iii; Q-ii; R-i; S-iv
- P-iii; Q-iv; R-i; S-ii
Show Solution
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The Correct Option is D
Solution and Explanation
Step 1: Understand each theory carefully.
Cellular-Clock Theory: Suggests that cells can divide only a certain number of times. (matches (iii))
Wear-and-Tear Theory: Suggests that over time, organs and tissues get damaged with use. (matches (iv))
Free-radical Theory: Suggests ageing occurs because of unstable oxygen molecules damaging cells. (matches (i))
Activity Theory: Suggests that staying active leads to more positive ageing. (matches (ii))
Step 2: Match correctly.
\[ \begin{aligned} P &\rightarrow (iii) \quad \text{(Cells are limited in replication)} \\ Q &\rightarrow (iv) \quad \text{(Wear and tear of tissues)} \\ R &\rightarrow (i) \quad \text{(Free radicals damaging cells)} \\ S &\rightarrow (ii) \quad \text{(Activity helps positive ageing)} \end{aligned} \]
Thus, the correct matching is:
\[ \boxed{(D) \, P\text{-}iii;\, Q\text{-}iv;\, R\text{-}i;\, S\text{-}ii} \]
Cellular-Clock Theory: Suggests that cells can divide only a certain number of times. (matches (iii))
Wear-and-Tear Theory: Suggests that over time, organs and tissues get damaged with use. (matches (iv))
Free-radical Theory: Suggests ageing occurs because of unstable oxygen molecules damaging cells. (matches (i))
Activity Theory: Suggests that staying active leads to more positive ageing. (matches (ii))
Step 2: Match correctly.
\[ \begin{aligned} P &\rightarrow (iii) \quad \text{(Cells are limited in replication)} \\ Q &\rightarrow (iv) \quad \text{(Wear and tear of tissues)} \\ R &\rightarrow (i) \quad \text{(Free radicals damaging cells)} \\ S &\rightarrow (ii) \quad \text{(Activity helps positive ageing)} \end{aligned} \]
Thus, the correct matching is:
\[ \boxed{(D) \, P\text{-}iii;\, Q\text{-}iv;\, R\text{-}i;\, S\text{-}ii} \]
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