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

Question

After a series of experiments, it was concluded that the …A… of coleoptile was the site of transmittable influence that caused the …B… of the entire coleoptile.
Complete the given statement with the correct combination of options given in the codes below

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
**Primary Concept**: Phototropism and the role of the coleoptile tip in plant bending.
**Related Topics**: Plant hormones (auxin), plant growth, light response.
**Prerequisites**: Basic knowledge of plant anatomy and phototropism.
## SOLUTION PATHWAY
**Given Information**:
The question describes an experiment where a transmittable influence causes the bending of a coleoptile.
**Method & Steps**:
1. **Identify the key structure:** The question refers to a 'coleoptile', which is the protective sheath covering the emerging shoot in grasses. The key part that senses light is the tip.
Reasoning: The tip of the coleoptile is known to be the region where light perception and auxin production occur.
2. **Determine the effect:** The question mentions that the influence causes 'bending'. This refers to the phototropic response where plants bend towards a light source.
Reasoning: Auxin, produced at the tip, migrates down the shaded side, causing differential growth and bending.
3. **Combine the parts to form a logical sentence:** The tip is the site of transmittable influence and that results in the bending of the entire coleoptile. 
Reasoning: This explains the mechanism of phototropism.
**Result**: The correct combination is A-tip; B-bending
Verification: This is consistent with the known mechanisms of phototropism.
## OPTION ANALYSIS
[A] :x: The root is not the primary site of light perception in phototropism.
[B] :x: While lateral growth is related to bending, the influence originates from the tip and not the lateral side.
[C] :x: The shoot is a general term for the aerial part, the tip is a more specific and accurate answer.
[D] ✓: The tip of the coleoptile is where light is perceived, and auxin production leads to bending.
## LEARNING AIDS
**Common Mistakes**:
1. Confusing the site of perception with the site of bending: The tip perceives, but bending occurs in the lower parts of the coleoptile.
2. Not remembering that auxin production and transport is the underlying mechanism.
**Quick Tips**:
1. Remember that 'tip' is key for light perception in coleoptiles.
2. Auxin is the plant hormone responsible for the phototropic response.

B VENKAT · Answer

A-root site; B-bending

B VENKAT · Answer

A-lateral side; B-bending

B VENKAT · Answer

A-shoot side; B-bending

B VENKAT · Answer

The correct Option is "A-tip; B-bending"

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