The Flower — NEET Biology MCQs with Solutions
Free NEET Biology The Flower MCQs with step-by-step solutions (90 questions). Part of Morphology of Flowering Plants. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — The Flower · easy · theory
A flower that can be divided into two equal halves by only ONE plane is:
A. Zygomorphic ✓ Correct
B. Trimerous
C. Actinomorphic
D. Asymmetric
Solution: Zygomorphic (e.g. pea, Cassia) = bilateral; actinomorphic (e.g. mustard, Datura) = radial.
Q2 — The Flower · easy · theory
The arrangement of ovules within the ovary is called:
A. Placentation ✓ Correct
B. Vernation
C. Aestivation
D. Phyllotaxy
Solution: Placentation types: marginal, axile, parietal, basal, free-central, superficial.
Q3 — The Flower · medium · theory
The mode of arrangement of sepals or petals in a floral bud is termed:
A. Aestivation ✓ Correct
B. Placentation
C. Phyllotaxy
D. Venation
Solution: Aestivation types include valvate, twisted, imbricate and vexillary.
Q4 — The Flower · medium · theory
Axile placentation, in which the placenta is axial and ovules attach to it in a multilocular ovary, is seen in:
A. Pea (marginal)
B. Mustard (parietal)
C. China rose, tomato, lemon ✓ Correct
D. Sunflower (basal)
Solution: Axile placentation occurs in China rose, tomato and lemon; marginal in pea, parietal in mustard, basal in sunflower.
Q5 — The Flower · hard · theory
A flower with the ovary situated ABOVE the other floral parts (which arise below it) is:
A. Half-inferior
B. Perigynous
C. Epigynous (inferior ovary)
D. Hypogynous (superior ovary) ✓ Correct
Solution: Hypogynous = superior ovary (e.g. mustard, China rose); epigynous = inferior ovary (e.g. guava, cucumber).
Q6 — The Flower · hard · theory
Vexillary (papilionaceous) aestivation, characteristic of the pea flower, has:
A. Valvate sepals
B. No overlap of petals
C. A large standard petal overlapping two wings, which overlap the two keel petals ✓ Correct
D. Five equal twisted petals
Solution: The pea corolla shows vexillary aestivation: standard (vexillum) → wings → keel — a diagnostic Fabaceae feature.
Q7 — The Flower · easy · numerical
A flower of Canna cannot be divided into two similar halves by any vertical plane passing through the centre. Such a flower is:
A. Bisexual
B. Actinomorphic
C. Asymmetric ✓ Correct
D. Zygomorphic
Solution: When no plane can divide a flower into two equal halves, it is asymmetric (irregular), as in Canna. Actinomorphic flowers divide by any radial plane; zygomorphic ones by only one plane.
Q8 — The Flower · easy · numerical
A flower in which the gynoecium is present but stamens are absent is best described as:
A. Staminate and unisexual
B. Pistillate (female) and unisexual ✓ Correct
C. Neuter
D. Bisexual
Solution: A flower with only carpels (no stamens) is a pistillate, unisexual flower. A staminate flower has only stamens; a bisexual flower has both.
Q9 — The Flower · medium · numerical
In a flower the margins of adjacent petals overlap one another in a regular, one-covering-the-next pattern like a twisted spiral, as in china rose. This aestivation is:
A. Valvate
B. Twisted (contorted) ✓ Correct
C. Imbricate
D. Vexillary
Solution: In twisted (contorted) aestivation one margin of each petal overlaps the next in a regular direction (china rose, cotton). Imbricate overlapping is irregular; in valvate the margins merely touch.
Q10 — The Flower · medium · numerical
In a flower of plum or rose the thalamus is flattened or cup-shaped so that the gynoecium sits at the centre while sepals, petals and stamens are borne on the rim at about the same level as the ovary. Such a flower is:
A. Perigynous, with a half-inferior ovary ✓ Correct
B. Hypogynous, with a superior ovary
C. Hypogynous, with an inferior ovary
D. Epigynous, with an inferior ovary
Solution: When the ovary is half-inferior and the other whorls arise on the rim of a cup-shaped thalamus at the ovary's level, the flower is perigynous (plum, rose, peach).
Q11 — The Flower · medium · numerical
In a multicarpellary ovary the ovules are attached along the central axis where the septa meet, dividing the ovary into as many chambers as carpels. This placentation is:
A. Axile ✓ Correct
B. Parietal
C. Free central
D. Marginal
Solution: Axile placentation has ovules on a central axis in a multilocular ovary (tomato, china rose, lemon). Parietal placentation lacks septa; free central has a central column without septa.
Q12 — The Flower · medium · numerical
Match the placentation with an example: (i) Marginal (ii) Parietal (iii) Free central (iv) Basal — with (p) Dianthus/Primrose (q) pea (r) sunflower/marigold (s) mustard/Argemone. The correct match is:
A. (i)-p, (ii)-q, (iii)-r, (iv)-s
B. (i)-s, (ii)-r, (iii)-q, (iv)-p
C. (i)-r, (ii)-p, (iii)-s, (iv)-q
D. (i)-q, (ii)-s, (iii)-p, (iv)-r ✓ Correct
Solution: Marginal placentation occurs in pea (q); parietal in mustard/Argemone (s); free central in Dianthus/Primrose (p); basal in sunflower/marigold (r).
Q13 — The Flower · easy · theory
In which family is an oblique ovary found?
A. Cruciferae
B. Compositae
C. Solanaceae ✓ Correct
D. Liliaceae
Solution: The obliquely placed ovary is a characteristic feature of family Solanaceae.
Q14 — The Flower · medium · theory
Given the following examples, in how many plants is the ovary inferior? Mustard, China rose, brinjal, plum, rose, guava, cucumber.
A. Four
B. One
C. Three
D. Two ✓ Correct
Solution: Only guava and cucumber have inferior (epigynous) ovaries; rose and plum are half-inferior and the rest superior.
Q15 — The Flower · easy · theory
A typical flower has four different kinds of whorls arranged on the end of the stalk or pedicel, called the
A. Internode
B. Peduncle
C. Thalamus (receptacle) ✓ Correct
D. Node
Solution: The swollen tip of the pedicel bearing the floral whorls is called the thalamus or receptacle.
Q16 — The Flower · easy · theory
If a flower cannot be divided into two similar halves by any vertical plane passing through the centre, it is called
A. Zygomorphic
B. Actinomorphic
C. Asymmetric ✓ Correct
D. Regular
Solution: A flower that cannot be divided into equal halves by any plane is asymmetric (e.g., Canna).
Q17 — The Flower · hard · theory
Read the following statements and find out how many are incorrect. a. Mustard has hypogynous, actinomorphic flower, parietal placentation, syncarpous gynoecium and belongs to Brassicaceae. b. China rose has superior ovary, twisted aestivation, monadelphous stamens and axile placentation. c. Pea has bilateral symmetry, vexillary aestivation, diadelphous stamens, marginal placentation and belongs to Fabaceae. d. Chilli has radial symmetry, epipetalous stamens, swollen placenta, monocarpellary gynoecium and belongs to Solanaceae. e. Lily has actinomorphic flower, axile placentation, imbricate aestivation, tricarpellary and trilocular gynoecium belonging to Liliaceae.
A. 3
B. 4
C. 2
D. 1 ✓ Correct
Solution: Only statement d is incorrect: chilli (Solanaceae) is bicarpellary, not monocarpellary.
Q18 — The Flower · easy · theory
A modified shoot wherein the shoot apical meristem changes to floral meristem is known as a
A. Peduncle
B. Flower ✓ Correct
C. Thalamus
D. Inflorescence
Solution: A flower is a modified shoot in which the shoot apical meristem is converted into a floral meristem.
Q19 — The Flower · medium · theory
Read the following statements and find the suitable option. a. Generally petals are green, leaf-like and protect the flower in the bud stage. b. Sepals are brightly coloured to attract insects for pollination. c. If stamens in a flower remain free this is called polyandrous. d. Each ovary bears one or more ovules attached to a flattened, cushion-like placenta. e. There may be variation in the length of filaments of stamens within a flower.
A. d and e are true but a, b and c are false
B. a, b and d are true but c and e are false
C. c, d and e are true but a and b are false
D. c and d are true but a, b and e are false ✓ Correct
Solution: Sepals (not petals) are green and protective; petals (not sepals) are coloured; free stamens are polyandrous and ovules sit on a placenta; hence only c and d are true.
Q20 — The Flower · easy · theory
Epipetalous is a condition of
A. Aestivation of petals
B. Placentation
C. Position of ovary
D. Stamens ✓ Correct
Solution: Epipetalous refers to stamens that are attached to (fused with) the petals, e.g., brinjal.
Q21 — The Flower · medium · theory
The expression 'gynoecium is apocarpous' implies that
A. Gynoecium comprises more than one carpel which are fused
B. Gynoecium comprises only one pistil fused with the stamens
C. Gynoecium comprises only one carpel which is free
D. Gynoecium comprises more than one carpel, all of which are free ✓ Correct
Solution: Apocarpous gynoecium has more than one carpel that remain free from one another, e.g., lotus, rose.
Q22 — The Flower · easy · theory
A flower which can be divided into two exactly equal halves by more than one vertical plane is
A. Hypogynous
B. Epigynous
C. Actinomorphic ✓ Correct
D. Zygomorphic
Solution: Radially symmetrical (actinomorphic) flowers can be divided into equal halves by any vertical plane.
Q23 — The Flower · medium · theory
When stamens are fused by their anthers and the filaments are free, the condition is called
A. Syngenesious ✓ Correct
B. Monadelphous
C. Epipetalous
D. Synandrous
Solution: Syngenesious stamens have fused anthers but free filaments (e.g., Asteraceae).
Q24 — The Flower · medium · theory
A flower is zygomorphic when
A. Only one vertical plane through its centre divides it into two equal halves ✓ Correct
B. Every vertical plane through its centre divides it into two equal halves
C. Only one transverse plane divides it into two equal halves
D. Any transverse plane divides it into two equal halves
Solution: A zygomorphic (bilaterally symmetrical) flower can be divided into two equal halves by only one vertical plane.
Q25 — The Flower · medium · theory
Stamens with free anthers but filaments fused into a number of groups are
A. Diadelphous
B. Monadelphous
C. Polyadelphous ✓ Correct
D. Syngenesious
Solution: Polyadelphous stamens have filaments united into several bundles, e.g., Citrus.
Q26 — The Flower · medium · theory
Bicarpellary, obliquely placed, syncarpous ovary with axile placentation is found in
A. Brassicaceae
B. Fabaceae
C. Solanaceae ✓ Correct
D. Asteraceae
Solution: A bicarpellary, syncarpous, obliquely placed ovary with axile placentation is characteristic of Solanaceae.
Q27 — The Flower · medium · theory
Monocarpellary ovary, diadelphous androecium and marginal placentation occur in
A. Liliaceae
B. Brassicaceae
C. Fabaceae ✓ Correct
D. Asteraceae
Solution: Fabaceae has a monocarpellary ovary, diadelphous (9)+1 stamens and marginal placentation.
Q28 — The Flower · easy · theory
Perianth occurs in the family
A. Solanaceae
B. Brassicaceae
C. Liliaceae ✓ Correct
D. Fabaceae
Solution: In Liliaceae, calyx and corolla are indistinguishable and are collectively called perianth (tepals).
Q29 — The Flower · medium · theory
A gynoecium having three fused carpels with a single ovule-containing chamber is
A. Tricarpellary, syncarpous, unilocular ✓ Correct
B. Tricarpellary, apocarpous, trilocular
C. Tricarpellary, syncarpous, trilocular
D. Tricarpellary, apocarpous, unilocular
Solution: Three fused carpels make it tricarpellary and syncarpous; a single chamber makes it unilocular.
Q30 — The Flower · medium · theory
In Fabaceae, which petals immediately enclose the essential organs?
A. Lateral petals (wings)
B. Sepals
C. Anterior petals (keel) ✓ Correct
D. Posterior petal (standard)
Solution: The two anterior petals form the keel, which encloses the stamens and gynoecium (essential organs).