This is not a `C_(3)` plant

Options

A. Amaranth
B. Rice
C. Wheat
D. Potato.

Answer

**Step-by-Step Solution:**

1. **Identify the Types of Plants:**
- Understand the classification of plants based on their photosynthetic pathways. The two main types are C3 and C4 plants.
- C3 plants primarily use the Calvin cycle for carbon fixation, while C4 plants have an additional step that helps them efficiently fix carbon in high light and temperature conditions.

2. **List the Given Options:**
- The options provided are: Amaranth, Rice, Wheat, and Potato.

3. **Determine Which Plants are C3:**
- Rice, Wheat, and Potato are all known to be C3 plants. They primarily thrive in cooler and wetter environments and do not exhibit the specialized anatomy associated with C4 plants.

4. **Identify the C4 Plant:**
- Amaranth (Amaranthus) is identified as a C4 plant. C4 plants, like Amaranth, are typically found in tropical and subtropical regions and have adaptations that allow them to minimize photorespiration and maximize photosynthesis under high light and temperature.

5. **Understand Kranz Anatomy:**
- C4 plants exhibit a specialized leaf structure known as Kranz anatomy, where bundle sheath cells surround the vascular bundles. These cells contain a high number of chloroplasts and are structurally different from the mesophyll cells, which have normal chloroplasts.

6. **Conclusion:**
- Since Amaranth is the only plant listed that is not a C3 plant, the correct answer to the question "This is not a C3 plant" is Amaranth.

**Final Answer:**
- The correct option is Amaranth.

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