Nicotiana tobacum, a short day plant , when exposed toi more than critical period of light fails to flower .Explain.

Explanation

### Step-by-Step Solution:

1. **Understanding Short Day Plants**:
- Short day plants are those that require a shorter duration of light (photoperiod) to initiate flowering. They typically flower when the length of daylight is less than a certain threshold known as the critical photoperiod.

2. **Critical Photoperiod**:
- The critical photoperiod is the specific duration of light that a short day plant needs to trigger its flowering process. If the duration of light exceeds this critical period, the plant does not receive the necessary signals to flower.

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