The Question is from neet-botany plant-growth-and-development photoperiodism, and it was created by the author NISHANTH

Question

Phytochrome is involved in many plant responses besides flowering. Which of the following is NOT a known role of phytochrome?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Phytochrome's roles in plant development
 **Related Topics**: Photomorphogenesis, seed germination, shade avoidance, stomatal regulation
 **Prerequisites**: Basic understanding of plant physiology and phytochrome's function as a photoreceptor.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify a plant response NOT mediated by phytochrome.
**Method & Steps**:
1. Analyze each option's relation to phytochrome.
  Reasoning: Phytochrome is a photoreceptor that absorbs red and far-red light, influencing various developmental processes.
  Formula/Rule:  No specific formula is needed; this is a knowledge-based question.
2. Evaluate the known roles of phytochrome.
  Working: 
            * Seed germination: Phytochrome regulates seed germination in response to light conditions.
            * Shade avoidance response: Phytochrome detects the ratio of red to far-red light, triggering stem elongation in shaded environments.
            * Photomorphogenesis: Phytochrome plays a crucial role in regulating various aspects of plant development in response to light, including seedling de-etiolation.
            * Regulation of stomatal closure: While light influences stomatal opening and closing, this is primarily mediated by blue light receptors, not phytochrome.
 3. Identify the option that does not align with established phytochrome functions.
  Result: Regulation of stomatal closure is not a known primary role of phytochrome.
  Verification:  Referencing reliable plant physiology textbooks and research confirms that stomatal closure is primarily regulated by blue light and abscisic acid, not phytochrome.
 ## OPTION ANALYSIS
A ✓: Seed germination is a well-established role of phytochrome.
B :x: Shade avoidance is a key function of phytochrome, mediating the plant's response to low red:far-red light ratios.
C :x: Stomatal closure is mainly controlled by blue-light receptors and other signaling pathways, not primarily phytochrome.
D :x: Photomorphogenesis is a broad term encompassing many developmental processes significantly influenced by phytochrome.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing phytochrome's roles with other photoreceptors (e.g., cryptochromes, phototropins):  Understanding the specific roles of different photoreceptors is essential.
  2.Overgeneralizing phytochrome's influence:  Phytochrome is a key player, but not the sole regulator in many plant processes.
 **Quick Tips**:
  1.Remember the key roles of phytochrome: seed germination, shade avoidance, and photomorphogenesis.
  2.Associate phytochrome with red and far-red light perception.

NISHANTH · Answer

Seed germination

NISHANTH · Answer

Shade avoidance response

NISHANTH · Answer

The correct Option is "Regulation of stomatal closure"

NISHANTH · Answer

Photomorphogenesis

NEET Botany Plant Growth and Development Photoperiodism MCQs

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