Origin of seed in land plants occured about

Options

A. 160 million years ago
B. 240 million years ago
C. 285 million years ago
D. 345 million years ago

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the origin of seeds in land plants. It is essential to identify which group of plants produces seeds.

2. **Identifying Seed-Producing Plants**: Seeds are produced by two main types of plants: gymnosperms and angiosperms. Angiosperms are flowering plants that produce seeds enclosed within a fruit.

3. **Determining the Timeframe**: Angiosperms are believed to have originated approximately 140 million years ago during the Cretaceous period. However, some estimates extend this to around 160 million years ago.

4. **Differentiating Between Plant Groups**: Angiosperms are further divided into two groups: dicots and monocots.
- **Dicots** originated during the Cretaceous period.
- **Monocots** originated later during the Quaternary period, which is part of the Cenozoic era.

5. **Conclusion**: Based on the information gathered, the origin of seeds in land plants, specifically angiosperms, occurred about 160 million years ago.

### Final Answer:
The origin of seeds in land plants occurred about **160 million years ago**.

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