The smallest and the lightest seed is that of

Options

A. Lemna
B. Marigold
C. Orchis
D. Wolffia

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the smallest and lightest seed among the given options: Lamina, Marigold, Orchis, and Wolffia.

2. **Analyzing Each Option**:
- **Lamina (Duckweed)**: This is an aquatic plant. While it has small seeds, they are not the smallest or lightest seeds available.
- **Marigold**: This plant belongs to the Asteraceae family. The seeds of marigold are also not the smallest or lightest, making this option incorrect.
- **Orchis (Orchids)**: Orchids belong to the Orchidaceae family and are known for having the world's smallest seeds. These seeds are extremely tiny, measuring about 1/1300 of an inch (approximately 85 micrometers), and they are also very light, containing an underdeveloped embryo without endosperm.
- **Wolffia**: Similar to Lamina, Wolffia is another aquatic plant and is known for having the smallest flowering plant. However, its seeds are not the smallest, so this option is also incorrect.

3. **Conclusion**: After analyzing all options, the correct answer is **Orchis**, as it has the smallest and lightest seeds.

**Final Answer**: The smallest and the lightest seed is that of **Orchis**.

---