Find the statement that is NOT correct with regard to the structure of monocot stem.

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Question

Find the statement that is NOT correct with regard to the structure of monocot stem.

Accepted Answer

Correct Answer: B — Hypodermis is parenchymatous.Step-by-step Solution:The internal structure of a monocot stem (e.g., maize/Zea mays) has several characteristic features. Evaluating each statement:(A) Phloem parenchyma is absent — TRUE (so A is a correct statement): In the vascular bundles of monocot stems, phloem consists of only sieve tubes and companion cells — phloem parenchyma is absent. Phloem fibres may also be present. In contrast, in dicot stems, phloem parenchyma is present.(B) Hypodermis is parenchymatous — FALSE = INCORRECT STATEMENT (Answer): In monocot stems, the hypodermis (the layer(s) immediately beneath the epidermis) is sclerenchymatous — composed of thick-walled, lignified sclerenchyma cells that provide mechanical support and rigidity to the stem. In dicot stems, the hypodermis is typically collenchymatous (in herbaceous dicots). This is a classic distinguishing feature. Option B says 'parenchymatous' which is wrong — it should be sclerenchymatous.(C) Vascular bundles are scattered — TRUE (correct statement): In monocot stems, the vascular bundles are scattered throughout the ground tissue (atactostele), without any specific arrangement in a ring. In dicot stems, vascular bundles are arranged in a ring (eustele) around the central pith.(D) Vascular bundles are conjoint and closed — TRUE (correct statement): Monocot stem vascular bundles are: Conjoint — both xylem and phloem present in the same bundle (in contrast to a bundle with only xylem or only phloem); Closed — no cambium between xylem and phloem, so secondary growth is absent in monocot stems. Each bundle is surrounded by a sclerenchymatous bundle sheath. Monocot VBs are conjoint, collateral (phloem outside xylem), closed.Extended Explanation:Comparison of monocot vs. dicot stem anatomy:FeatureMonocot StemDicot StemEpidermisSingle layer, cuticleSingle layer, cuticleHypodermisSclerenchymatousCollenchymatousGround tissueNot differentiated into cortex/pithCortex, endodermis, pericycle, pithVB arrangementScattered (atactostele)Ring (eustele)VB typeConjoint, collateral, closedConjoint, collateral, openCambiumAbsent (closed VB)Present (open VB)Phloem parenchymaAbsentPresentBundle sheathSclerenchymatousMay be absent or thinSecondary growthGenerally absentPresent (via cambium)Key Concepts: Monocot stem anatomy, sclerenchymatous hypodermis, scattered vascular bundles, conjoint and closed VBs, absence of phloem parenchyma and cambium, comparison with dicot stem.

Find the statement that is NOT correct with regard to the structure of monocot stem.

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Find the statement that is NOT correct with regard to the structure of monocot stem.

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