The Question is from neet-botany plant-growth-and-development , and it was created by the author Mr. NARESH KUMAR K

Question

The 'Richmond-Lang effect', which refers to the delay of senescence in leaves by cytokinins, is primarily attributed to their influence on:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Cytokinin effects on plant senescence
 **Related Topics**: Plant hormones, leaf senescence, nutrient metabolism
 **Prerequisites**: Basic understanding of plant physiology and the role of plant hormones.
## SOLUTION PATHWAY
**Given Information**:
  The Richmond-Lang effect describes the delay of leaf senescence by cytokinins.
  We need to identify the primary mechanism through which cytokinins achieve this delay.
**Method & Steps**:
 1. Understand the role of cytokinins in plant growth and development.
  Reasoning: Cytokinins are plant hormones that promote cell division, growth, and differentiation. They also play a crucial role in delaying senescence.
  Formula/Rule:  None directly applicable, this is a conceptual question.
 2. Consider the options provided and their relevance to senescence.
  Working:  Let's analyze each option:
        * **Ethylene production:** Ethylene is a plant hormone that accelerates senescence.  Therefore, cytokinins counteracting ethylene production is a plausible mechanism.
        * **Cell wall synthesis:** While cytokinins influence cell division and growth, their primary role in delaying senescence is not directly through cell wall synthesis.
        * **Nutrient mobilization:** Cytokinins influence the mobilization of nutrients from older leaves to younger leaves. This nutrient redirection helps maintain the vitality of younger tissues and delays senescence in older leaves.
        * **Stomatal closure:** Stomatal closure is primarily related to water conservation, not directly to the delay of senescence.
 3. Identify the most significant mechanism.
  Result: The most significant effect of cytokinins in delaying senescence is their influence on nutrient mobilization.  They actively redirect nutrients, delaying the breakdown processes associated with senescence.
  Verification: The Richmond-Lang effect is well-established, and research supports the role of cytokinins in nutrient mobilization as a key factor in delaying senescence.
 ## OPTION ANALYSIS
A :x: Ethylene production is associated with senescence, not its delay.
B :x: Cell wall synthesis is not the primary mechanism by which cytokinins delay senescence.
C ✓: Nutrient mobilization is a key mechanism by which cytokinins delay senescence, aligning with the Richmond-Lang effect.
D :x: Stomatal closure is not the primary mechanism involved in the Richmond-Lang effect.
 ## LEARNING AIDS
 **Common Mistakes**:
  1. Confusing the roles of different plant hormones:  Students might incorrectly associate ethylene with senescence delay.
   How to avoid:  Focus on the specific actions of each hormone in relation to senescence.
  2. Overlooking the importance of nutrient mobilization: Students may focus on other aspects of cytokinin action instead of its crucial role in nutrient redistribution.
   How to avoid:  Understand that cytokinins are not just about cell division; they have a significant impact on resource allocation within the plant.
 **Quick Tips**:
  1. Remember that cytokinins act as anti-senescence hormones.
  2. Associate cytokinins with nutrient redirection from older to younger leaves.

Mr. NARESH KUMAR K · Answer

Ethylene production

Mr. NARESH KUMAR K · Answer

Cell wall synthesis

Mr. NARESH KUMAR K · Answer

The correct Option is "Nutrient mobilization"

Mr. NARESH KUMAR K · Answer

Stomatal closure

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