In a dicotyledonous stem, the sequence of tissues from the outside to the inside is

Options

A. Phellem-Percycle-Endodermsi-Phloem
B. Phellem-Phloem-Endodermis-Pericycle
C. Phellem-Endodermsi-Percycle-Phloem
D. Pericycle-Phellem-Endodermis-Phloem

Answer

To answer the question regarding the sequence of tissues in a dicotyledonous stem from the outside to the inside, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Outermost Layer**: The outermost layer of a dicotyledonous stem is the **cork (phallum)**. This layer serves as a protective barrier.

2. **Next Layer - Cork Cambium**: Beneath the cork, there is a layer known as the **cork cambium (fallogen)**, which is responsible for producing new cork cells.

3. **Cortex Layer**: The next layer inward is the **cortex**, which is composed of parenchyma cells and serves as storage and support.

4. **Endodermis**: The innermost layer of the cortex is called the **endodermis**. This layer regulates the movement of water and nutrients into the vascular system.

5. **Pericycle**: Following the endodermis, we find the **pericycle**, which is a layer of cells that can give rise to lateral roots and contributes to the secondary growth of the plant.

6. **Phloem**: Finally, the innermost layer is the **phloem**, which is responsible for the transport of nutrients, particularly sugars, throughout the plant.

### Final Sequence:
Thus, the correct sequence of tissues from the outside to the inside in a dicotyledonous stem is:
- Cork (Phallum)
- Cork Cambium (Fallogen)
- Cortex
- Endodermis
- Pericycle
- Phloem

### Correct Answer:
The correct arrangement of tissues from the outside to the inside is: **Cork (Phallum), Endodermis, Pericycle, Phloem**.

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