Semi-Technical Description & Floral Formula — NEET Biology MCQs with Solutions
Free NEET Biology Semi-Technical Description & Floral Formula MCQs with step-by-step solutions (13 questions). Part of Morphology of Flowering Plants. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Semi-Technical Description & Floral Formula · easy · theory
In a floral diagram/formula, the symbol "⊕" represents a flower that is:
A. Unisexual male
B. Actinomorphic (radially symmetrical) ✓ Correct
C. Bisexual only
D. Zygomorphic
Solution: ⊕ denotes actinomorphic symmetry; % (or a curved arrow) denotes zygomorphic.
Q2 — Semi-Technical Description & Floral Formula · easy · theory
In a floral formula, the symbol "K" stands for the:
A. Gynoecium
B. Androecium
C. Corolla
D. Calyx (sepals) ✓ Correct
Solution: K = calyx, C = corolla, A = androecium, G = gynoecium; P = perianth (when calyx and corolla are alike).
Q3 — Semi-Technical Description & Floral Formula · medium · theory
A bracket around the number of members of a whorl in a floral formula indicates that the members are:
A. Whorled
B. Absent
C. Free
D. Fused (connate) ✓ Correct
Solution: A bracket shows fusion (cohesion) within a whorl; a line above G indicates a superior ovary.
Q4 — Semi-Technical Description & Floral Formula · medium · theory
In a floral formula, a line drawn ABOVE the gynoecium symbol G indicates:
A. A superior ovary (hypogynous flower) ✓ Correct
B. An inferior ovary
C. Fused carpels
D. A unisexual flower
Solution: A line above G = superior ovary; a line below G = inferior ovary.
Q5 — Semi-Technical Description & Floral Formula · hard · theory
The floral formula ⊕ K(5) C(5) A5 G(2) with a superior ovary is typical of:
A. Fabaceae
B. Poaceae
C. Liliaceae
D. Solanaceae (e.g. Datura, tomato) ✓ Correct
Solution: Fused calyx and corolla (5 each), 5 epipetalous stamens, bicarpellary syncarpous superior ovary — Solanaceae.
Q6 — Semi-Technical Description & Floral Formula · hard · theory
The symbol "P" is used in a floral formula when:
A. The flower is bisexual
B. The ovary is inferior
C. Stamens are fused
D. The calyx and corolla are not distinct (perianth of tepals) ✓ Correct
Solution: When sepals and petals are indistinguishable (e.g. Liliaceae), the whorl is the perianth (P) of tepals.
Q7 — Semi-Technical Description & Floral Formula · easy · numerical
In a floral formula, the symbol for a zygomorphic (bilaterally symmetric) flower is:
A. The letter G with a line above
B. A percentage-like sign (%) ✓ Correct
C. A comma between whorls
D. A star/plus symbol (⊕)
Solution: Zygomorphy is denoted by a "%" -like symbol, while actinomorphy (radial symmetry) is denoted by ⊕. These indicate flower symmetry at the start of a floral formula.
Q8 — Semi-Technical Description & Floral Formula · easy · numerical
In a floral formula the letter "A" represents the:
A. Androecium (stamens) ✓ Correct
B. Gynoecium (carpels)
C. Calyx (sepals)
D. Corolla (petals)
Solution: A stands for androecium (male whorl of stamens). K is calyx, C is corolla, G is gynoecium and P is perianth.
Q9 — Semi-Technical Description & Floral Formula · medium · numerical
In the floral formula of a mustard flower, the androecium is written as A2+4. This notation indicates that the stamens are:
A. Diadelphous — nine united and one free
B. Tetradynamous — six stamens in two whorls, an outer pair short and an inner four long ✓ Correct
C. Monadelphous — all united into a single bundle
D. Epipetalous — attached to the petals
Solution: A2+4 denotes tetradynamous stamens: two outer short and four inner long, the diagnostic androecium of Brassicaceae (mustard family).
Q10 — Semi-Technical Description & Floral Formula · medium · numerical
In a floral diagram, the small dot or circle drawn on the axis side opposite the bract represents the:
A. Position of the mother axis (the stem bearing the flower) ✓ Correct
B. Position of the bracteole only
C. Type of aestivation of the corolla
D. Number of ovules in each locule
Solution: A floral diagram shows the position of the mother axis by a dot at the top, with the bract at the bottom, orienting all the whorls relative to the stem.
Q11 — Semi-Technical Description & Floral Formula · medium · numerical
A student writes a floral formula as C(5), meaning the five petals are:
A. Free (polypetalous), because a bracket means separation
B. United (gamopetalous), as shown by the bracket enclosing the number ✓ Correct
C. Fused with the stamens only
D. Reduced to scales
Solution: A bracket around the number of members of a whorl indicates fusion (cohesion) of those members; C(5) therefore means five united petals — a gamopetalous corolla.
Q12 — Semi-Technical Description & Floral Formula · medium · theory
An aspect of a flower shown in the floral formula but not in the floral diagram is
A. Position of ovary ✓ Correct
B. Cohesion of floral parts
C. Aestivation
D. Floral symmetry
Solution: The position of the ovary (superior/inferior) is shown in the floral formula by a line above or below the gynoecium symbol, whereas the diagram shows symmetry, aestivation and cohesion.
Q13 — Semi-Technical Description & Floral Formula · medium · theory
A floral diagram fails to indicate
A. Aestivation of the corolla
B. Position of the ovary on the thalamus ✓ Correct
C. Placentation of ovules
D. Cohesion of carpels and stamens
Solution: The floral diagram cannot show whether the ovary is superior or inferior; that position is shown by the floral formula/section.