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Some flowers (e.g., Oxalis) open in the ...

Some flowers (e.g., Oxalis) open in the morning and close during evening because of

A

Photonasty

B

Phototropism

C

Phototaxis

D

Nyctinasty.

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question about why some flowers, such as Oxalis, open in the morning and close in the evening, we can follow these steps: **Step 1: Understand the terms related to plant movements.** - Familiarize yourself with the terms: photonasty, phototropism, phototaxis, and nastic movements. **Step 2: Define photonasty.** - Photonasty refers to the nastic movements of plant parts in response to light. This is a non-directional response, meaning the movement does not depend on the direction of the light source. **Step 3: Identify the specific behavior of Oxalis flowers.** - Oxalis flowers exhibit a specific behavior where they open in response to light during the day and close in the absence of light at night. This behavior is a classic example of photonasty. **Step 4: Differentiate from other terms.** - Understand that phototropism is the growth of plants towards light, while phototaxis refers to the movement of organisms towards or away from light. Nastic movements, in general, are responses that are not dependent on the direction of the stimulus. **Step 5: Conclude with the correct answer.** - Since Oxalis flowers open and close in response to light, the correct answer to the question is "photonasty."
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