A plant lives for less than one years. It is
(a) Annual
(b) Biennial
(c) Semi-annual
(d) Perennial

Options

A. Annual
B. Biennial
C. Semi-annual
D. Perennial

Answer

To solve the question, we need to identify the type of plant based on its lifespan. The question states that the plant lives for less than one year. Let's analyze the options provided:

1. **Annual**: These are plants that complete their life cycle in one year or less. This means they grow, flower, produce seeds, and die all within a single growing season. Since the question specifies a plant that lives for less than one year, this option fits perfectly.

2. **Biennial**: Biennial plants take two years to complete their life cycle. They typically grow in the first year and flower and produce seeds in the second year. Since the plant in question lives for less than one year, this option is not correct.

3. **Semi-annual**: This term is not commonly used in botany to describe plant life cycles. It might imply a plant that lives for about six months, but it is not a standard classification. Therefore, this option is also not correct.

4. **Perennial**: Perennial plants live for multiple years, often returning year after year. They do not fit the description of a plant that lives for less than one year.

Based on this analysis, the correct answer is:

**(a) Annual**

### Step-by-Step Solution:
1. **Read the question carefully**: Understand that it refers to a plant that lives for less than one year.
2. **Analyze the options**:
- **Annual**: Lives for one year or less. (Fits the description)
- **Biennial**: Lives for two years. (Does not fit)
- **Semi-annual**: Not a standard term in botany. (Does not fit)
- **Perennial**: Lives for many years. (Does not fit)
3. **Select the correct option**: Since only "Annual" fits the description of living for less than one year, choose option (a).