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

Question

Which pigment is responsible for absorbing light in photoperiodism?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Photoperiodism and plant pigment function
 **Related Topics**: Plant physiology, light absorption, photoreceptor pigments
 **Prerequisites**: Understanding of plant responses to light, basic knowledge of pigment types.
## SOLUTION PATHWAY
**Given Information**:
The question asks about the pigment responsible for light absorption in photoperiodism.
**Method & Steps**:
1. Understand Photoperiodism: Photoperiodism is the physiological response of plants to the relative lengths of day and night.  It regulates various developmental processes like flowering, seed germination, and tuber formation.
2. Identify the relevant pigment:  While chlorophyll is crucial for photosynthesis, it's not the primary pigment involved in detecting day length for photoperiodic responses. Carotenoids and xanthophylls are accessory pigments in photosynthesis, also not directly involved in sensing day length. Phytochrome, however, is a photoreceptor pigment specifically sensitive to red and far-red light, which are key in determining day length.
3. Phytochrome's role: Phytochrome exists in two interconvertible forms, Pr (red-absorbing) and Pfr (far-red absorbing). The ratio of these forms, influenced by the relative amounts of red and far-red light in the environment (which varies with day length), triggers the plant's photoperiodic response.
 Result: Phytochrome is the crucial pigment for light absorption in photoperiodism.
 Verification: The established understanding of plant physiology confirms phytochrome's role as the primary photoreceptor for photoperiodic responses.
## OPTION ANALYSIS
A :x: Chlorophyll's primary function is in photosynthesis, not directly in detecting day length for photoperiodic responses.
B :x: Carotenoids are accessory pigments in photosynthesis, not involved in photoperiodism signaling.
C ✓: Phytochrome is the photoreceptor pigment that detects red and far-red light, crucial for sensing day length and triggering photoperiodic responses.
D :x: Xanthophylls are also accessory photosynthetic pigments, not involved in the photoperiodism pathway.
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing chlorophyll with photoperiodism pigments:  Remember chlorophyll's main role is photosynthesis, not photoperiodism.
  2.Overlooking phytochrome's specific function:  Phytochrome is a dedicated photoreceptor for detecting light involved in photoperiodic responses.
 **Quick Tips**:
  1.Remember the key role of phytochrome in sensing red and far-red light ratios for photoperiodic regulation.
  2.Associate phytochrome with photoperiodism directly; it's the central player.

B VENKAT · Answer

Chlorophyll

B VENKAT · Answer

Carotenoids

B VENKAT · Answer

The correct Option is "Phytochrome"

B VENKAT · Answer

Xanthophyll

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