Pith in Monocot Stem
In monocot stems, the pith is primarily composed of parenchyma cells, not sclerenchyma cells. Here’s a detailed explanation:
Understanding Pith
- The pith is a central part of the stem, situated between the vascular bundles.
- It is usually made up of loosely packed cells that are involved in storage and sometimes in support.
Cell Types in Pith
- Parenchyma Cells:
- These are the main type of cells found in the pith.
- They are thin-walled, living cells that play a crucial role in storage (of starch, water, and nutrients) and can also participate in photosynthesis.
- Collenchyma Cells:
- These cells provide flexible support and are typically found in young stems and petioles.
- They are not a major component of the pith in monocots.
- Sclerenchyma Cells:
- These cells are known for their thick, lignified walls and are primarily involved in providing structural support.
- They are usually found in regions of the plant needing rigidity, like the outer layers, rather than in the pith.
- Tracheid Cells:
- These are water-conducting cells found in the xylem of vascular plants.
- They are not part of the pith; instead, they are involved in the transport of water and minerals.
Conclusion
The correct answer to the question is actually option 'A' (Parenchyma cells), as the pith in monocot stems is primarily made up of parenchyma, which serves important functions in storage and support. Sclerenchyma cells are not the primary component of the pith.