Read the following statement and find out INCORRECT statement .
(a) Both a short day plant and a long day plant can flower simultaneously in a given place .
(b) Sugar beet cabbage and carrot are common biennials .
(c) Some important food plants, wheat, barley , and rye have three kinds of varieties : winter, summer, and spring varieties
(d) Many of the extrinsic factors such as temperature and light , control plants growth and development.

Options

A. a and d
B. b and c
C. c and d
D. d and e

Answer

To determine the incorrect statement from the given options, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (a)**: "Both a short day plant and a long day plant can flower simultaneously in a given place."
- **Analysis**: Short day plants require a shorter photoperiod to flower, while long day plants require a longer photoperiod. Therefore, they cannot flower at the same time in the same location since the photoperiod cannot be both short and long simultaneously.
- **Conclusion**: This statement is **incorrect**.

2. **Statement (b)**: "Sugar beet, cabbage, and carrot are common biennials."
- **Analysis**: Biennial plants complete their life cycle in two years. Sugar beet, cabbage, and carrot are indeed classified as biennials, and they can be induced to flower through a process called vernalization.
- **Conclusion**: This statement is **correct**.

3. **Statement (c)**: "Some important food plants, wheat, barley, and rye have three kinds of varieties: winter, summer, and spring varieties."
- **Analysis**: Wheat and barley are typically classified into winter and spring varieties. There is no recognized category of "summer varieties" for these plants. Therefore, this statement is misleading as it incorrectly states there are three varieties.
- **Conclusion**: This statement is **incorrect**.

4. **Statement (d)**: "Many of the extrinsic factors such as temperature and light control plant growth and development."
- **Analysis**: This statement is true. Environmental factors like temperature and light significantly influence plant growth and development, including processes like photoperiodism and vernalization.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The incorrect statements are (a) and (c).