Pith

Options

A. Is made up of thin-walled, parenchymatous cells which may be with or without intercellular spaces
B. n dicotyledonous stems pith also extends in between the vascular bundles
C. It chiefly serves as the store house of several excretory substances, such as tannins, phenols, calcium oxalate, etc.
D. All statements are correct

Explanation

### Step-by-Step Text Solution for the Question: Pith

1. **Definition of Pith**:
- Pith, also known as medulla, is a tissue found in the central part of stems and roots in plants.

2. **Location of Pith**:
- In dicotyledonous (dicot) plants, the pith occupies the central portion of the stem and roots.
- In monocotyledonous (monocot) plants, the pith is not distinctly recognized due to the arrangement of vascular bundles.

3. **Composition of Pith**:
- The pith is primarily composed of large parenchyma cells.
- These parenchyma cells can have intercellular spaces, which may or may not be present.

4. **Pith in Dicotyledonous Stems**:
- In dicot stems, the pith extends between the vascular bundles.
- This extension is referred to as medullary rays or pith rays.

5. **Function of Pith**:
- The pith serves as a storage area for various excretory substances, including tannins, phenols, and calcium oxalate.

6. **Summary of Key Points**:
- Pith is also called medulla.
- It is located in the center of dicot stems and roots but is not distinctly recognized in monocot stems.
- Composed of parenchyma cells, it may have intercellular spaces.
- In dicots, it extends between vascular bundles and forms medullary rays.
- It acts as a storehouse for excretory substances.