Question

Coiling of garden pea tendrils around any support is an example of:

• A. Thermotaxis
• B. Thigmotaxis
• C. Thigmotropism
• D. Thigmonasty

Hint:

\textbf{Tropism} → directional growth response
\textbf{Nasty} → non-directional movement
Tendril coiling around support → classic example of \textbf{thigmotropism} Always check whether the movement is growth-based or not.

Answer 1

The Correct Option is C

Step 1: Understand the phenomenon described. Garden pea tendrils coil around a support in response to touch. The movement involves directional growth toward the stimulus.
Step 2: Recall definitions of the given terms.
Thermotaxis: Movement of organisms in response to temperature.
Thigmotaxis: Directional movement of \emph{entire organisms} in response to touch.
Thigmotropism: Directional growth movement of a plant part in response to touch.
Thigmonasty: Non-directional movement in response to touch (e.g., closing of Mimosa leaves).
Step 3: Identify the correct category. Since tendril coiling:
is a growth response,
is directional,
occurs in plants due to touch, it is classified as thigmotropism.
Hence, the correct answer is \[ \boxed{\text{Thigmotropism}} \]