alleryStart learning →A tree exposed to constant strong wind shows which developmental response?
AGrowth is stunted and the trunk thickens
BGrowth is stunted and the trunk narrows
CGrowth is hastened and the trunk thickens
DGrowth is hastened and the trunk narrows
Answer & Solution
Correct answer: A. Growth is stunted and the trunk thickens
1. Thigmomorphogenesis is a slow developmental change in the shape of a plant under continuous mechanical stress.
2. When trees bend in the wind, growth is usually stunted and the trunk thickens.
3. Strengthening tissue, especially xylem, is produced to add stiffness against the force of the wind.
4. A narrower trunk would be less able to resist bending, so it is the opposite of the observed response.
5. Ethylene and jasmonate are likely to be involved in this response.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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