Question:
"Richmond-Lang effect" on the process of ageing and remobilization of nutrients is associated with this hormone in plants:
"Richmond-Lang effect" on the process of ageing and remobilization of nutrients is associated with this hormone in plants:
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Associate "Richmond-Lang" with "delay of leaf senescence," which is one of the most prominent physiological roles of Cytokinins.
Updated On: Jul 31, 2026
- Abscisic acid
- Cytokinins
- Gibberellins
- Ethylene
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Senescence is the genetically programmed process of biological aging in plants, characterized by the breakdown of chlorophyll, proteins, and nucleic acids.
Step 2: Detailed Explanation:
In 1957, scientists Richmond and Lang demonstrated that applying kinetin (a type of cytokinin) to detached leaves delayed the onset of senescence.
This delay, known as the "Richmond-Lang effect," keeps treated leaves green while untreated controls yellow and die.
Cytokinins delay senescence by preserving chlorophyll content, maintaining protein synthesis, and acting as a physiological sink that draws nutrients toward the treated area.
Step 3: Final Answer:
The Richmond-Lang effect is associated with Cytokinins.
Senescence is the genetically programmed process of biological aging in plants, characterized by the breakdown of chlorophyll, proteins, and nucleic acids.
Step 2: Detailed Explanation:
In 1957, scientists Richmond and Lang demonstrated that applying kinetin (a type of cytokinin) to detached leaves delayed the onset of senescence.
This delay, known as the "Richmond-Lang effect," keeps treated leaves green while untreated controls yellow and die.
Cytokinins delay senescence by preserving chlorophyll content, maintaining protein synthesis, and acting as a physiological sink that draws nutrients toward the treated area.
Step 3: Final Answer:
The Richmond-Lang effect is associated with Cytokinins.
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