Bulk portion of primary organs in plants is made up of

Options

A. Collenchyma
B. Parenchyma
C. Sclerenchyma
D. Vascular tissue

Answer

**Step-by-Step Solution:**

1. **Understanding Primary Organs:**
- Primary organs in plants refer to the essential structures that are present from the very beginning of the plant's development. These include the root, stem, and leaves.

2. **Identifying the Bulk Portion:**
- The bulk portion of these primary organs is primarily made up of ground tissue. Ground tissue is one of the three main types of plant tissues, the other two being dermal and vascular tissues.

3. **Components of Ground Tissue:**
- Ground tissue consists of three main types of cells:
- **Parenchyma:** This is the most common type of ground tissue, found throughout the plant in various forms.
- **Collenchyma:** Provides flexibility and support, mainly in young stems and leaves.
- **Sclerenchyma:** Provides mechanical support and strength, but is not as widely distributed as parenchyma.

4. **Importance of Parenchyma:**
- Parenchyma is crucial because it is found in almost all parts of the plant, including the cortex of roots and stems, mesophyll of leaves, and pulp of fruits. It plays various roles such as storage, photosynthesis, and tissue repair.

5. **Evaluating the Options:**
- The options provided include Collenchyma, Sclerenchyma, Parenchyma, and Vascular Tissue.
- Collenchyma mainly provides flexibility and is not the bulk component.
- Sclerenchyma provides mechanical support but does not form the bulk of primary organs.
- Vascular tissue (xylem and phloem) is responsible for transport and does not constitute the bulk of primary organs.

6. **Conclusion:**
- Based on the analysis, the correct answer is **Parenchyma**, as it forms the bulk portion of the primary organs in plants.