Flowering response to length of day and night in plants is called

Options

A. Photoropism
B. Photorespiration
C. Photoperiodism
D. Photo-oxidation.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:** The question asks about the flowering response of plants to the length of day and night. This indicates that we are looking for a term that describes how plants react to varying light conditions in relation to their flowering.

2. **Analyzing the Options:**
- **Phototropism:** This term refers to the growth or movement of plants towards light. It does not relate to flowering responses, so this option is incorrect.
- **Photorespiration:** This process occurs when plants take in oxygen and release carbon dioxide in the presence of light, which is the opposite of photosynthesis. This is also unrelated to flowering, making this option incorrect.
- **Photoperiodism:** This is the phenomenon where a plant's physiological processes, such as flowering, are influenced by the duration of light and darkness it experiences. This option is relevant to the question.
- **Photooxidation:** This term generally refers to the process where light causes oxidation reactions in plants, which is not related to flowering responses. Thus, this option is incorrect.

3. **Identifying the Correct Answer:** Since photoperiodism directly relates to how plants respond to the length of day and night for flowering, it is the correct answer.

4. **Conclusion:** The flowering response to the length of day and night in plants is called **photoperiodism**.

---