Anatomy of Stems — NEET Biology MCQs with Solutions
Free NEET Biology Anatomy of Stems MCQs with step-by-step solutions (6 questions). Part of Anatomy of Flowering Plants. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Anatomy of Stems · easy · theory
In a dicot stem, the vascular bundles are arranged in a ______, whereas in a monocot stem they are ______:
A. Scattered; ring
B. Radial; radial
C. Single; single
D. Ring; scattered ✓ Correct
Solution: Dicot stem bundles form a ring; monocot stem bundles are scattered in the ground tissue.
Q2 — Anatomy of Stems · easy · theory
Vascular bundles of a dicot stem are ______ (contain cambium and can grow), while those of a monocot stem are ______:
A. Concentric; radial
B. Open; closed ✓ Correct
C. Closed; open
D. Radial; conjoint
Solution: Dicot bundles are "open" (with cambium → secondary growth); monocot bundles are "closed" (no cambium).
Q3 — Anatomy of Stems · medium · theory
In a monocot stem, each vascular bundle is surrounded by a sheath of ______:
A. Cork
B. Parenchyma only
C. Endodermis
D. Sclerenchyma (bundle sheath) ✓ Correct
Solution: Monocot bundles are enclosed by a sclerenchymatous bundle sheath and are conjoint, collateral and closed.
Q4 — Anatomy of Stems · medium · theory
The xylem in a dicot stem is ______, with the protoxylem toward the centre:
A. Endarch ✓ Correct
B. Exarch
C. Mesarch
D. Centrarch
Solution: Stems have endarch xylem (protoxylem toward the pith), the reverse of roots.
Q5 — Anatomy of Stems · hard · theory
The presence of a "lysigenous cavity" (water-containing cavity) within the vascular bundle is characteristic of:
A. Dicot stems
B. Dicot roots
C. Isobilateral leaves
D. Monocot stems (e.g. maize) ✓ Correct
Solution: In monocot stems the protoxylem often has a lysigenous water cavity — a diagnostic feature (e.g. maize).
Q6 — Anatomy of Stems · hard · theory
Secondary growth (increase in girth via vascular and cork cambium) generally occurs in ______ but NOT in typical ______:
A. All monocots; all dicots
B. Dicot stems/roots; monocot stems ✓ Correct
C. Monocot stems; dicot roots
D. Leaves; roots
Solution: Dicots (open bundles) undergo secondary growth; typical monocots lack a vascular cambium and do not.