StemCET Logo

Botany Question 14 – AP-EAMCET 2025

← Back
List-IList-IIA) Mechanical support at young stem and leaf petioleI) SclereidsB) Cells in fruit walls of nutsII) Stem vascular bundlesC) Cells absent in primary phloemIII) Collenchyma tissueD) Endarch primary xylemIV) Bast fibers

Recall the primary functions and locations of different plant tissues like collenchyma, sclerenchyma (sclereids), and vascular tissues (xylem and phloem).

Step 1: Analyze List-I and List-II items✦ Active

List-I describes functions, locations, or characteristics of plant structures/tissues, while List-II provides specific plant tissues or structures. We need to find the correct pairings.

Step 2: Match A) Mechanical support at young stem and leaf petiole○ Expand

Collenchyma tissue (III) is specialized for providing flexible mechanical support to young stems and petioles, especially in dicotyledonous plants, due to its unevenly thickened cell walls.

Therefore, A matches with III.

💡 Teacher's Secret Hint

Remember that collenchyma provides support in growing regions, unlike sclerenchyma which provides rigid support in mature parts.

Step 3: Match B) Cells in fruit walls of nuts○ Expand

Sclereids (I) are a type of sclerenchyma cell, characterized by highly thickened, lignified walls, and are responsible for the hardness and gritty texture found in fruit walls of nuts (e.g., stone cells in pears, shells of nuts).

Therefore, B matches with I.

💡 Teacher's Secret Hint

Sclereids are dead cells at maturity and provide protection and rigidity.

Step 4: Match D) Endarch primary xylem○ Expand

Endarch arrangement refers to the development of primary xylem where the protoxylem (first-formed xylem) is located towards the center (pith) and the metaxylem (later-formed xylem) towards the periphery. This arrangement is characteristic of primary xylem in stems, which are organized into vascular bundles (II).

Therefore, D matches with II.

💡 Teacher's Secret Hint

Recall the different arrangements of primary xylem: endarch (stems), exarch (roots), and mesarch (ferns).

Step 5: Determine the remaining match for C) Cells absent in primary phloem○ Expand

Based on the previous correct matches (A-III, B-I, D-II), the only remaining option for C is IV.

So, C matches with IV) Bast fibers.

💡 Teacher's Secret Hint

While bast fibers (phloem fibers) are generally considered components of primary phloem (especially metaphloem), this match is derived by elimination from the other strong and correct matches. In some specific contexts or early developmental stages (protophloem), fibers might be absent, but generally, bast fibers are present in phloem. However, given the options, this is the most likely intended pairing.

✦ STEM Console utilizes AI models to generate step-by-step explanations and math clues. AI can make mistakes.