Question

Identify the tissues in correct sequence based on the given characters
A) Cell walls are thickened with cellulose, hemicellulose and pectin.
B) Cellulose walls Polygonal and perform photosynthesis.
C) Thickened and lignified cell walls with pits. Options :

• A. Parenchyma, Sclerenchyma, Sclerides
• B. Sclerides, Sclerenchyma, Parenchyma
• C. Collenchyma, Parenchyma, Sclerenchyma
• D. Sclerenchyma, Parenchyma, Sclerides

Hint:

Remember the distinct cell wall characteristics for different simple permanent tissues: \begin{itemize} \item \textbf{Parenchyma:} Thin, cellulose cell walls; often involved in photosynthesis/storage. \item \textbf{Collenchyma:} Unevenly thickened cell walls (cellulose, hemicellulose, pectin); provides flexible support in growing regions. \item \textbf{Sclerenchyma:} Thick, lignified cell walls with pits; provides rigid mechanical support in mature regions. \end{itemize}

Answer 1

The Correct Option is C

Step 1: Analyze Statement A)
Statement A describes cell walls thickened with cellulose, hemicellulose, and pectin. This is characteristic of Collenchyma tissue. Collenchyma cells have unevenly thickened primary cell walls, providing support to young, growing parts of the plant, such as stems and petioles. Step 2: Analyze Statement B)
Statement B mentions cellulose walls that are polygonal and perform photosynthesis. This describes Parenchyma tissue. Parenchyma cells are typically isodiametric or polygonal, have thin primary cell walls made of cellulose, and are often involved in photosynthesis (e.g., palisade and spongy parenchyma in leaves), storage, and other metabolic functions. Step 3: Analyze Statement C)
Statement C refers to thickened and lignified cell walls with pits. This is a defining characteristic of Sclerenchyma tissue. Sclerenchyma cells have heavily thickened, lignified secondary cell walls, which make them rigid and provide mechanical support to mature parts of the plant. The pits are thin areas in the cell wall that allow for communication between cells. Sclerenchyma includes fibers and sclereids. The question asks for the tissue, and Sclerenchyma is the broader category that encompasses such cells. Step 4: Formulate the sequence and check options
Based on the analysis from Steps 1, 2, and 3, the correct sequence matching statements A, B, and C respectively is:
A $\rightarrow$ Collenchyma
B $\rightarrow$ Parenchyma
C $\rightarrow$ Sclerenchyma
Thus, the sequence is Collenchyma, Parenchyma, Sclerenchyma. Comparing this with the given options:
% Option (1) Parenchyma, Sclerenchyma, Sclerides (Incorrect)
% Option (2) Sclerides, Sclerenchyma, Parenchyma (Incorrect)
% Option (3) Collenchyma, Parenchyma, Sclerenchyma (Matches our derived sequence)
% Option (4) Sclerenchyma, Parenchyma, Sclerides (Incorrect)
Therefore, Option (3) is the correct answer.