Key Fact
Root system
Roots: tap (dicots) vs fibrous (monocots) vs adventitious (banyan prop, maize stilt, mangrove pneumatophores). Functions: anchorage, absorption, conduction, storage.
-- NCERT Class 11 Biology, Ch. 5, p. 58Morphology Flowering Plants
8 MCQs9-step worked example
Source: NCERT Structural Organisation in Animals and PlantsPYQ coverage: NEET 2020, 2022, 2023, 2024, 2025, 2026Official key: NTA-verifiedLast updated: 24 Sep 2026
Morphology Flowering Plants, explained for NEET
The morphology chapter tests your ability to match structural features to specific plant examples — and NEET exploits one confusion more than any other in this topic: placentation types.
Aspirants routinely swap axile for parietal or forget which family carries which placentation. The trap fires when a question names a plant (mustard, lemon, pea) and asks you to identify the placentation — or gives a placentation type and asks for the correct example.
Core recall framework (NCERT Class 11 Biology Chapter 5):
The root system divides into tap root (dicots) and fibrous/adventitious (monocots). Stems show modifications: runners (grass), tubers (potato), bulbs (onion). Leaves vary by venation: reticulate (dicots) vs parallel (monocots), with modifications into tendrils (pea) and spines (cactus) (NCERT Class 11 Biology Chapter 5, pages 64–65).
Inflorescence types — racemose (flowers in acropetal succession) vs cymose (basipetal) — appear as direct recall questions. Flower parts: calyx, corolla, androecium, gynoecium. The gynoecium's ovule attachment defines placentation: marginal (pea/Fabaceae), axile (china rose, lemon/Solanaceae), parietal (mustard/Brassicaceae), free central (Dianthus), basal (sunflower) (NCERT Class 11 Biology Chapter 5, page 65).
Aestivation — the arrangement of petals in a bud — is another frequent confusion point. Valvate: edges touch without overlap (Calotropis). Twisted: one edge overlaps the next petal (China rose). Imbricate: irregular overlap (Cassia). Vexillary: papilionaceous arrangement with a large standard petal (pea) (NCERT Class 11 Biology Chapter 5, page 64).
Watch-out: When NEET asks "Which plant shows parietal placentation?", the distractor set will include lemon (axile) and pea (marginal). Anchor your answer to the family: Brassicaceae = parietal, always.
Can you answer these Morphology Flowering Plants MCQs?
Select an option to see the explanation. Wrong answers show why your choice was tempting — and name the exact trap it exploits.
MCQ 1Easy RecallPractice
Which of the following plants shows marginal placentation?
Show answer and why every option is right or wrong
Answer: C. Pea (Fabaceae) has marginal placentation where ovules are attached along the margin of a single carpel (NCERT Class 11 Biology Chapter 5, page 65).
Why A is wrong: A — Mustard (Brassicaceae) shows parietal placentation, not marginal. Confusing these two is a common trap because both are unilocular, but parietal has ovules on the wall.
Why B is wrong: B — China rose (Malvaceae) shows axile placentation with a multilocular ovary. Picking this confuses the ovary structure entirely.
Why D is wrong: D — Sunflower (Asteraceae) shows basal placentation where the single ovule is at the base of the ovary.
MCQ 2Easy RecallPractice
Twisted aestivation is characteristic of which flower?
Show answer and why every option is right or wrong
Answer: D. China rose (Hibiscus) shows twisted (contorted) aestivation where one margin of each petal overlaps the next petal (NCERT Class 11 Biology Chapter 5, page 64).
Why A is wrong: A — Calotropis has valvate aestivation where petal margins touch without overlapping. Students confuse this with twisted because both sound like 'arranged.'
Why B is wrong: B — Cassia shows imbricate aestivation with irregular overlapping of petals, not the regular one-over-next pattern of twisted.
Why C is wrong: C — Pea shows vexillary (papilionaceous) aestivation with a large standard, two wings, and a keel — distinctive to Fabaceae.
MCQ 3Easy RecallPractice
The modification of stem into a flattened, green, photosynthetic structure is called:
Show answer and why every option is right or wrong
Answer: A. A phylloclade is a flattened, green stem that takes over the function of photosynthesis (e.g., Opuntia). The stem is modified because true leaves are reduced to spines (NCERT Class 11 Biology Chapter 5, pages 64–65).
Why B is wrong: B — A phyllode is a modified petiole (leaf stalk) that becomes flat and photosynthetic (e.g., Acacia auriculiformis). It is a leaf modification, not a stem modification.
Why C is wrong: C — A cladode is a limited-growth modified stem internode (one or two internodes only, e.g., Asparagus). Phylloclade has unlimited growth — that's the distinction.
Why D is wrong: D — A bulbil is a modified axillary bud used for vegetative propagation (e.g., Agave), not for photosynthesis.
MCQ 4Direct ApplicationPractice
A student observes a flower with 5 sepals, 5 petals with twisted aestivation, numerous stamens (monadelphous), and axile placentation. The plant most likely belongs to family:
Show answer and why every option is right or wrong
Answer: B. Malvaceae (e.g., China rose) is characterised by twisted aestivation, monadelphous stamens (filaments fused into a tube), and axile placentation. This combination is diagnostic (NCERT Class 11 Biology Chapter 5, pages 64–65).
Why A is wrong: A — Solanaceae has 5 stamens (not numerous/monadelphous) and valvate aestivation in calyx. The monadelphous condition immediately rules out Solanaceae.
Why C is wrong: C — Fabaceae shows vexillary aestivation and diadelphous stamens (9+1 fused filaments). Neither twisted aestivation nor monadelphous condition fits.
Why D is wrong: D — Brassicaceae has only 6 stamens (tetradynamous: 4 long + 2 short) and parietal placentation, not axile.
MCQ 5Direct ApplicationPractice
Identify the correct match of placentation type and plant example:
Show answer and why every option is right or wrong
Answer: C. Dianthus (Caryophyllaceae) shows free central placentation where ovules are borne on a central axis without septa (NCERT Class 11 Biology Chapter 5, page 65).
Why A is wrong: A — Mustard (Brassicaceae) has parietal placentation, not axile. Lemon has axile — swapping these two is the classic placentation trap.
Why B is wrong: B — Lemon (Rutaceae) shows axile placentation with a multilocular ovary. Parietal placentation belongs to mustard.
Why D is wrong: D — Dianthus has free central placentation, not marginal. Marginal placentation is seen in pea (Fabaceae) with a single carpel.
MCQ 6Direct ApplicationPractice
A student notes that a plant has reticulate venation, tap root, and tetramerous flowers. Which of the following is INCORRECT about this plant?
Show answer and why every option is right or wrong
Answer: D. While reticulate venation and tap root indicate a dicot, placentation type is NOT determined by being a dicot. Dicots show marginal (pea), axile (lemon), parietal (mustard), free central (Dianthus), and basal (sunflower) — all different types across different families. Saying a dicot "must have" axile placentation is incorrect.
Why A is wrong: A — Reticulate venation + tap root + tetramerous flowers are all dicot features. This statement is correct.
Why B is wrong: B — Dicot stems typically have conjoint, open vascular bundles (cambium present). This is a correct generalisation for typical dicots.
Why C is wrong: C — The stem already states reticulate venation, so this is simply restating the observation — it is correct.
MCQ 7Concept TrapPractice
Valvate aestivation differs from imbricate aestivation in that:
Show answer and why every option is right or wrong
Answer: A. In valvate aestivation, the margins of petals (or sepals) are placed edge to edge, touching but not overlapping at all (e.g., Calotropis). In imbricate, the overlap is irregular — neither uniform (twisted) nor absent (valvate) (NCERT Class 11 Biology Chapter 5, page 64).
Why B is wrong: B — This describes imbricate aestivation, not valvate. The hallmark of valvate is zero overlap.
Why C is wrong: C — Having one completely internal petal is a feature seen in some imbricate arrangements. In valvate, no petal is internal or external — all are at the same level.
Why D is wrong: D — Valvate occurs in both monocots and dicots (Calotropis is a dicot). There is no such restriction.
MCQ 8CalculationPractice
Consider the following statements:
(i) Pea has vexillary aestivation and marginal placentation
(ii) Mustard has cruciform corolla and axile placentation
(iii) China rose has twisted aestivation and axile placentation
(iv) Calotropis has valvate aestivation and free central placentation
How many of the above statements are correct?
Show answer and why every option is right or wrong
Answer: B. Statement (i) is correct — pea (Fabaceae) has vexillary aestivation and marginal placentation. Statement (iii) is correct — China rose (Malvaceae) has twisted aestivation and axile placentation. Statement (ii) is wrong: mustard has parietal (not axile) placentation. Statement (iv) is wrong: Calotropis (Asclepiadaceae) does not have free central placentation. Two statements are correct.
Why A is wrong: A — This would mean only one statement is correct, but both (i) and (iii) are verified correct. Students who mistakenly think China rose has valvate aestivation may reject (iii).
Why C is wrong: C — This requires three correct statements, but (ii) fails on placentation (mustard = parietal, not axile) and (iv) fails on placentation type for Calotropis. Only two are correct.
Why D is wrong: D — Both (ii) and (iv) contain placentation errors. Mustard is parietal and Calotropis is not free central. Students who haven't memorised family-wise placentation may accept all four.
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How do you solve a Morphology Flowering Plants question? A worked example
- 1
Given
A flower has the following features:• Zygomorphic symmetry• Papilionaceous corolla (one standard, two wings, two keel petals fused)• Diadelphous stamens (9 fused + 1 free)• Monocarpellary, unilocular ovary
- 2
Required
Identify: (a) the family, (b) the aestivation type, and (c) the placentation type.
- 3
Concept
Floral formula features are diagnostic of plant families. Papilionaceous corolla + diadelphous stamens is the signature combination of Fabaceae (sub-family Papilionoideae).
- 4
Formula / Rule
Family identification rule: Papilionaceous + diadelphous + monocarpellary → Fabaceae.
Fabaceae placentation rule: monocarpellary, unilocular → ovules along the ventral suture → marginal placentation.
Fabaceae aestivation: vexillary (descending imbricate specific to papilionaceous flowers). - 5
Substitution / Application
• Papilionaceous corolla + diadelphous (9+1) + monocarpellary → confirms Fabaceae• Fabaceae corolla arrangement → vexillary aestivation• Monocarpellary, unilocular, ovules on ventral suture → marginal placentation
- 6
Reasoning chain
Zygomorphic symmetry narrows to Fabaceae or Brassicaceae among common NEET families. Brassicaceae has tetradynamous stamens (4+2) and a bicarpellary ovary with parietal placentation — clearly different from diadelphous + monocarpellary. The combination uniquely identifies Fabaceae.
- 7
Final answer
(a) Family: Fabaceae (Papilionoideae)
(b) Aestivation: Vexillary
(c) Placentation: Marginal - 8
Common trap
The distractor in NEET will offer "axile placentation" for pea — this exploits the fact that many students associate legumes with multi-chambered fruits (thinking of the pod's appearance) and pick axile. The key distinction: pea has a SINGLE carpel (monocarpellary), so there's no central axis for axile attachment. Marginal = single carpel, ovules along the margin.
- 9
Similar NEET-style question
"A plant shows actinomorphic flowers, valvate calyx, twisted corolla, monadelphous stamens, and a syncarpous, multilocular ovary with axile placentation. Identify the family."
Answer: Malvaceae (China rose). The twisted + monadelphous + axile combination is the diagnostic triplet.
---
What to remember before solving Morphology Flowering Plants questions
Key Fact
Inflorescence types
Racemose (indefinite — younger flowers at apex; e.g. radish, mustard) vs cymose (definite — older at apex; e.g. solanum). Peduncle, pedicel, bract.
-- NCERT Class 11 Biology, Ch. 5, p. 61Key Fact
Flower parts
Calyx (sepals), corolla (petals), androecium (stamens), gynoecium (carpels). Floral symmetry: actinomorphic (radial), zygomorphic (bilateral). Aestivation: valvate, twisted, imbricate, vexillary. Placentation: marginal, axile, parietal, free central, basal.
-- NCERT Class 11 Biology, Ch. 5, p. 62Where do students lose marks on Morphology Flowering Plants?
These are the exact patterns that cause wrong answers in NEET. Each trap includes when it triggers and how to avoid it.
Category: Similar Terms
Marginal (peas), axile (china rose, lemon), parietal (mustard), free central (Dianthus), basal (sunflower).
When it triggers
Question gives plant family/example and asks placentation.
How to avoid
Memorise per family: Solanaceae axile; Brassicaceae parietal; Fabaceae marginal.
Root cause: term confusion
Correction
Valvate: edges touch (Calotropis). Twisted: one edge overlaps next (China rose). Imbricate: irregular overlap (Cassia). Vexillary: papilionaceous (pea — flag-like standard).
More in Structural Organisation in Animals and Plants: 15 exam traps and mistakes · 1 question pattern from its other lessons.
Morphology Flowering Plants questions from past NEET papers
12 questions from NEET 2020, 2022, 2023, 2024, 2025, 2026. Answers verified against NTA official keys.
NEET 2026
1A-II, B-IV, C-I, D-III
2A-IV, B-II, C-III, D-I
3A-IV, B-III, C-I, D-II
4A-IV, B-II, C-I, D-III
NTA Answer: Option 4(final)
NEET 2025
Which of the following is an example of a zygomorphic flower?
1Chilli
2Petunia
3Datura
4Pea
NTA Answer: Option 4(final)
NEET 2025
1Statement I is incorrect but Statement II is correct
2Both Statement I and Statement II are correct
3Both Statement I and Statement II are incorrect
4Statement I is correct but Statement II is incorrect
NTA Answer: Option 1(final)
NEET 2024Revised key
Which of the following is an example of actinomorphic flower?
1Datura
2Cassia
3Pisum
4Sesbania
NTA Answer: Option 1(revised_final)
NEET 2024Revised key
1(a) Epigynous; (b) Hypogynous
2(a) Hypogynous; (b) Epigynous
3(a) Perigynous; (b) Epigynous
4(a) Perigynous; (b) Perigynous
NTA Answer: Option 4(revised_final)
NEET 2024Revised key
1A-II, B-IV, C-I, D-III
2A-I, B-II, C-III, D-IV
3A-IV, B-III, C-II, D-I
4A-II, B-III, C-IV, D-I
NTA Answer: Option 1(revised_final)
NEET 2024Revised key
1A-IV, B-II, C-I, D-III
2A-IV, B-I, C-II, D-III
3A-I, B-II, C-IV, D-III
4A-III, B-I, C-IV, D-II
NTA Answer: Option 1(revised_final)
NEET 2023
Axile placentation is observed in
1China rose, Beans and Lupin
2Tomato, Dianthus and Pea
3China rose, Petunia and Lemon
4Mustard, Cucumber and Primrose
NTA Answer: Option 3(final)
NEET 2023
1Both A and R are true but R is NOT the correct explanation of A
2A is true but R is false
3A is false but R is true
4Both A and R are true and R is the correct explanation of A
NTA Answer: Option 4(final)
NEET 2022
1(c), (d), (e) Only
2(a), (b), (c) Only
3(b), (c) Only
4(d), (e) Only
NTA Answer: Option 3(final)
NEET 2020
1Half inferior ovary
2Inferior ovary
3Superior ovary
4Hypogynous ovary
NTA Answer: Option 2(final)
NEET 2020
The ovary is half inferior in :
1Plum
2Brinjal
3Mustard
4Sunflower
NTA Answer: Option 1(final)
All 49 past-paper questions from Structural Organisation in Animals and Plants →
Sources
NCERT refs: Class 11 Biology Chapter 5, p.65 | Class 11 Biology Chapter 5, p.64
Page numbers are the ones printed in the current NCERT textbook (2023 rationalised edition), unless marked pre-2023. The books are free at ncert.nic.in.
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