The Stem — NEET Biology MCQs with Solutions
Free NEET Biology The Stem MCQs with step-by-step solutions (6 questions). Part of Morphology of Flowering Plants. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — The Stem · easy · theory
The stem is distinguished from the root by bearing:
A. Root hairs and a root cap
B. Pneumatophores
C. Only a radicle
D. Nodes, internodes, and buds ✓ Correct
Solution: Stems bear nodes, internodes, leaves and buds, and generally grow away from gravity (negatively geotropic).
Q2 — The Stem · easy · theory
An underground stem modified for food storage, as in potato, is a:
A. Corm
B. Bulb
C. Rhizome
D. Tuber ✓ Correct
Solution: The potato is a stem tuber (with "eyes"/axillary buds); ginger is a rhizome, onion a bulb, colocasia a corm.
Q3 — The Stem · medium · theory
The thorns of Citrus and Bougainvillea are modified:
A. Stipules
B. Roots
C. Leaves
D. Axillary buds (stems) ✓ Correct
Solution: Stem thorns arise in the axil and protect the plant; tendrils of grapevine are also stem modifications.
Q4 — The Stem · medium · theory
A stem tendril helps a weak plant in climbing and arises from the:
A. Axillary bud ✓ Correct
B. Petiole only
C. Leaf apex only
D. Root
Solution: Stem tendrils (e.g. grapevine, cucumber) are modified axillary buds for climbing.
Q5 — The Stem · hard · theory
The phylloclade of Opuntia is a modified stem that is green and flattened to perform photosynthesis because:
A. It stores no water
B. Leaves are reduced to spines to check water loss ✓ Correct
C. Roots are absent
D. It is actually a modified leaf
Solution: In xerophytes like Opuntia, the flattened green stem (phylloclade) photosynthesises while leaves become water-saving spines.
Q6 — The Stem · hard · theory
Runner, stolon, offset and sucker are sub-aerial stem modifications for:
A. Storage of water
B. Support only
C. Vegetative propagation ✓ Correct
D. Respiration
Solution: These sub-aerial stems (e.g. grass runner, mint stolon, water hyacinth offset, chrysanthemum sucker) spread and propagate the plant.