This question pairs four plant tissue descriptions (labelled I to IV in the figure) against listed characteristics, and asks which combination is correctly matched. Go through what each tissue is really known for.
Collenchyma: This is a living tissue with uneven, extra thickening of cellulose, hemicellulose and pectin at the corners of its cells. It gives flexible, bendable support to growing parts, not rigid support, so a description tying it to lignified rigid support does not belong to collenchyma.
Sclerenchyma: Made of dead cells with thick, lignified walls, sclerenchyma is built for rigid mechanical strength in mature plant parts. A description mentioning lignin and firm mechanical support correctly points to sclerenchyma.
Xylem vessels: These are dead, lignified, tube like cells joined end to end mainly to move water and minerals upward. They add some mechanical strength as a side effect, but their defining role is conduction, not general support.
Parenchyma (in hydrophytes): In water plants this simple living tissue develops large air spaces, called aerenchyma, that trap air for buoyancy and let gases move through the plant body. A description mentioning air storage and floating correctly points to parenchyma of this type.
Checking each label against its real function shows that the description matching lignified rigid support belongs to sclerenchyma (II) and the one matching air storage for buoyancy belongs to parenchyma in hydrophytes (IV), while the collenchyma and xylem descriptions do not line up with their listed statements.
Let's summarize:
Rigid, lignified support: sclerenchyma, not collenchyma.
Air storage and buoyancy: parenchyma (aerenchyma) in hydrophytes.
Only combinations II and IV hold up under this check.
