A part of the combining ring in roots arise from ground parenchyma and anoher part from

Options

A. xylem parenchya
B. phloem parenchyma
C. pith cells
D. pericycle

Answer

To answer the question about the parts of the combining ring in roots that arise from ground parenchyma and another part, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Combining Ring**: The combining ring in roots refers to the structure that contributes to the growth of the root, particularly in relation to the vascular tissues. It is essential to identify what components contribute to this structure.

2. **Identify the First Part**: The question states that one part of the combining ring arises from ground parenchyma. Ground parenchyma in roots primarily refers to the storage and support tissues, which include the parenchyma cells found in the cortex.

3. **Identify the Second Part**: The question asks for the second part that contributes to the combining ring. We need to consider what other tissues or layers in the root can contribute to this structure.

4. **Consider Possible Options**: The options typically include:
- Cork
- Cork cambium
- Phloem parenchyma
- Zylem parenchyma
- Pith cells
- Pericycle

5. **Eliminate Incorrect Options**:
- Zylem parenchyma and phloem parenchyma are already mentioned as ground parenchyma, so they can be eliminated.
- Pith cells are located at the center of the root and are also parenchyma, so they can be eliminated.
- Cork and cork cambium are related to the outer protective layer but do not contribute to the combining ring in roots.

6. **Identify the Correct Answer**: The pericycle is a layer of cells located just inside the endodermis and is responsible for the formation of lateral roots and can also contribute to the cambium. Therefore, the second part of the combining ring arises from the pericycle.

### Final Answer:
The second part of the combining ring in roots arises from the **pericycle**.

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