Select the incorrect statement with reference to the collenchyma :

Question

Accepted Answer

Option 3 is the correct answer because it states that the cells of collenchyma are thickened at the corners due to the deposition of lignin. This statement is incorrect. In reality, the thickening in collenchyma cells is primarily due to the deposition of cellulose and pectin, not lignin. Lignin is typically associated with the thickening of sclerenchyma cells, which are different from collenchyma cells. Collenchyma cells are characterized by their unevenly thickened cell walls, which provide flexibility and support to the plant, particularly in young stems and leaves.

Now, let's explain why each of the other options is incorrect:

1. **Chloroplasts may be present in collenchyma**: This statement is correct. Collenchyma cells can contain chloroplasts, especially when they are located in parts of the plant that are exposed to light, such as stems and leaves. This allows them to participate in photosynthesis.

2. **Collenchyma allow easy bending without breakage of the young stem**: This statement is correct. One of the primary functions of collenchyma is to provide mechanical support while allowing flexibility. This characteristic enables young stems and leaves to bend without breaking, which is crucial for their growth and adaptation to environmental conditions.

4. **Protoplasm is present in collenchyma**: This statement is correct. Collenchyma cells are living cells, and like all living plant cells, they contain protoplasm. This includes the cytoplasm, nucleus, and other organelles necessary for the cell's metabolic activities.

In summary, Option 3 is the incorrect statement because it inaccurately attributes the thickening of collenchyma cell walls to lignin, whereas the thickening is actually due to cellulose and pectin. The other options accurately describe characteristics and functions of collenchyma cells.