Question

Match the LIST-I with LIST-II

LIST-I Types of Sclereids	LIST-II  Examples
A. Astrosclereids	IV. Nymphea leaves
B. Macrosclereids	III. Kidney bean seeds
C. Osteosclereids	II. Olive leaves
D. Trichosclereids	I. Leaves of Monocots

Choose the correct answer from the options given below:

• A. A-I, B-II, C-III, D-IV
• B. A-IV, B-III, C-I, D-II
• C. A-I, B-II, C-IV, D-III
• D. A-III, B-IV, C-I, D-II

Hint:

To remember sclereid types, use their names as clues: Astro = star (like in Nymphea), Macro = large/columnar (like in seed coats), Osteo = bone (spool-shaped), Tricho = hair (like in olive leaves).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The question requires matching different morphological types of sclereids (stone cells) with plant parts where they are characteristically found. Sclereids are a type of sclerenchyma cell with highly thickened, lignified walls.
Step 2: Detailed Explanation:
Let's match each type of sclereid with its example:

A. Astrosclereids: These are star-shaped sclereids with radiating arms. They are famously found in the leaves and petioles of aquatic plants like the water lily, {Nymphea}. Thus, A matches with IV.

B. Macrosclereids: These are elongated, rod-shaped or columnar cells. They are very common in the seed coats of leguminous plants, forming a hard protective layer. Kidney bean seeds belong to the legume family. Thus, B matches with III.

D. Trichosclereids: These are hair-like, often branched sclereids that can be very long. They are found in the leaves and stems of various plants, including the leaves of the Olive tree ({Olea europaea}). Thus, D matches with II.

C. Osteosclereids: These are bone-shaped or spool-shaped sclereids, being enlarged at their ends. They are found in seed coats and leaves, including the sub-epidermal layers in the leaves of some monocots. Thus, by elimination and by known occurrences, C matches with I.

Step 3: Final Answer:
The correct set of matches is A-IV, B-III, C-I, D-II, which corresponds to option (B).