Abscisic acid is synthesized more abundantly in

Options

A. Chloroplasts
B. Endoplasmic reticulum
C. Ribosomes
D. Peroxisomes

Answer

**Step-by-Step Solution:**

1. **Understanding Abscisic Acid (ABA):** Abscisic acid is a plant hormone that plays a crucial role in various developmental processes in plants, including seed dormancy, bud dormancy, and the regulation of stomatal closure.

2. **Identifying the Synthesis Location:** The question asks where abscisic acid is synthesized more abundantly. To answer this, we need to know the specific cellular structures involved in the synthesis of ABA.

3. **Reviewing the Options:**
- **Chloroplast:** Known for its role in photosynthesis and also involved in the synthesis of various plant hormones.
- **Endoplasmic Reticulum:** Primarily involved in protein and lipid synthesis, not specifically in ABA synthesis.
- **Ribosomes:** Sites of protein synthesis, not directly involved in hormone synthesis.
- **Peroxisomes:** Involved in various metabolic processes but not the primary site for ABA synthesis.

4. **Linking to the Synthesis Pathway:** Abscisic acid is synthesized through the isoprenoid pathway, specifically the methylerythritol phosphate (MEP) pathway, which occurs in chloroplasts and amyloplasts.

5. **Conclusion:** Based on the information gathered, abscisic acid is synthesized more abundantly in the chloroplasts.

**Final Answer:** Abscisic acid is synthesized more abundantly in **chloroplasts** (Option A).

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