🌿 Concepts: Flower Structure 🌿
1. A typical flower is best described as
A. Modified stem
B. Modified root
C. Modified leaf
D. Modified shoot
Answer: D
Explanation: A flower is a modified shoot, meant for sexual reproduction.
2. The point where the floral parts are attached is called
A. Pedicel
B. Thalamus
C. Calyx
D. Bract
Answer: B
Explanation: Thalamus (receptacle) bears all four floral whorls.
3. A flower without pedicel is known as
A. Complete
B. Actinomorphic
C. Sessile
D. Hypogynous
Answer: C
Explanation: Sessile flowers lack a pedicel.
4. A flower having all four whorls is called
A. Incomplete
B. Complete
C. Unisexual
D. Neutral
Answer: B
Explanation: Presence of calyx, corolla, androecium, gynoecium = complete flower.
5. Which of the following is NOT a floral whorl?
A. Calyx
B. Corolla
C. Thalamus
D. Androecium
Answer: C
Explanation: Thalamus is a supporting structure, not a whorl.
6. Sepals collectively form
A. Corolla
B. Calyx
C. Androecium
D. Gynoecium
Answer: B
Explanation: Sepals together form the calyx.
7. The main function of calyx is
A. Attraction
B. Protection
C. Pollination
D. Fertilization
Answer: B
Explanation: Calyx protects the flower bud.
8. Brightly coloured petals help in
A. Protection
B. Seed formation
C. Attraction of pollinators
D. Nutrition
Answer: C
Explanation: Petals attract insects for pollination.
9. Androecium represents
A. Female reproductive part
B. Male reproductive part
C. Sterile whorl
D. Perianth
Answer: B
Explanation: Androecium consists of stamens (male).
10. A stamen is composed of
A. Anther and ovary
B. Filament and stigma
C. Filament and anther
D. Style and anther
Answer: C
Explanation: Each stamen has a filament + anther.
11. The fertile part of a stamen is
A. Filament
B. Anther
C. Connective
D. Pollen sac
Answer: B
Explanation: Anther produces pollen grains.
12. Pollen grains are formed in
A. Ovary
B. Ovule
C. Microsporangium
D. Megasporangium
Answer: C
Explanation: Microsporangia inside anther form pollen.
13. Gynoecium is also called
A. Pistil
B. Stamen
C. Perianth
D. Thalamus
Answer: A
Explanation: Female reproductive whorl = pistil.
14. A pistil consists of
A. Anther, filament, stigma
B. Stigma, style, ovary
C. Ovary, ovule, pollen
D. Style, ovule, filament
Answer: B
Explanation: Pistil = stigma + style + ovary.
15. Ovules are present inside
A. Style
B. Stigma
C. Ovary
D. Thalamus
Answer: C
Explanation: Ovary encloses ovules.
16. A flower having both androecium and gynoecium is
A. Unisexual
B. Bisexual
C. Neutral
D. Sterile
Answer: B
Explanation: Bisexual flowers have both reproductive organs.
17. Mustard flower is
A. Unisexual
B. Neutral
C. Bisexual
D. Sterile
Answer: C
Explanation: Mustard has both stamens and pistil.
18. Papaya flower is
A. Bisexual
B. Neutral
C. Unisexual
D. Sterile
Answer: C
Explanation: Papaya bears unisexual flowers.
19. A flower that can be divided into two equal halves in any plane is
A. Zygomorphic
B. Actinomorphic
C. Asymmetric
D. Hypogynous
Answer: B
Explanation: Actinomorphic = radial symmetry.
20. Pea flower is an example of
A. Actinomorphic
B. Zygomorphic
C. Asymmetric
D. Neutral
Answer: B
Explanation: Pea flower shows bilateral symmetry.
21. A flower lacking symmetry is
A. Actinomorphic
B. Zygomorphic
C. Asymmetric
D. Regular
Answer: C
Explanation: Asymmetric flowers have no plane of symmetry.
22. When sepals and petals are indistinguishable, they are called
A. Bracts
B. Tepals
C. Perianth
D. Ligules
Answer: B
Explanation: Tepals occur when calyx and corolla look alike.
23. Presence of perianth is common in
A. Dicots
B. Monocots
C. Gymnosperms
D. Bryophytes
Answer: B
Explanation: Monocots usually have tepals/perianth.
24. Ovary position above other floral parts is
A. Epigynous
B. Perigynous
C. Hypogynous
D. Amphigynous
Answer: C
Explanation: Hypogynous = superior ovary.
25. Mustard flower shows
A. Epigynous condition
B. Hypogynous condition
C. Perigynous condition
D. Inferior ovary
Answer: B
Explanation: Mustard has superior ovary.
26. Sunflower shows
A. Hypogynous flower
B. Perigynous flower
C. Epigynous flower
D. Amphigynous flower
Answer: C
Explanation: Sunflower has inferior ovary (epigynous).
27. In epigynous flowers, ovary is
A. Superior
B. Half inferior
C. Inferior
D. Absent
Answer: C
Explanation: Epigynous flowers have inferior ovary.
28. The number of stamens equals petals in
A. Didynamous condition
B. Tetradynamous condition
C. Isostemonous condition
D. Polyandrous condition
Answer: C
Explanation: Isostemonous = equal number.
29. Six stamens where four are long and two short is
A. Didynamous
B. Tetradynamous
C. Polyandrous
D. Monadelphous
Answer: B
Explanation: Tetradynamous condition (Brassica).
30. Didynamous condition is seen in
A. Mustard
B. Pea
C. Salvia
D. China rose
Answer: C
Explanation: Salvia has two long + two short stamens.
31. Stamens united by filaments into one bundle are
A. Diadelphous
B. Polyadelphous
C. Monadelphous
D. Syngenesious
Answer: C
Explanation: Monadelphous = one bundle.
32. China rose shows
A. Diadelphous stamens
B. Monadelphous stamens
C. Polyadelphous stamens
D. Free stamens
Answer: B
Explanation: Stamens united into one bundle.
33. Stamens united by anthers is called
A. Monadelphous
B. Diadelphous
C. Polyadelphous
D. Syngenesious
Answer: D
Explanation: Syngenesious = anthers fused.
34. Ovules attached to placenta show
A. Placentation
B. Aestivation
C. Phyllotaxy
D. Germination
Answer: A
Explanation: Arrangement of ovules = placentation.
35. Mustard shows
A. Axile placentation
B. Marginal placentation
C. Parietal placentation
D. Free central placentation
Answer: C
Explanation: Mustard has parietal placentation.
36. Pea shows
A. Axile placentation
B. Marginal placentation
C. Parietal placentation
D. Basal placentation
Answer: B
Explanation: Ovules attached along margin = marginal.
37. Axile placentation is seen in
A. Mustard
B. Pea
C. Tomato
D. Sunflower
Answer: C
Explanation: Tomato has axile placentation.
38. Free central placentation is seen in
A. China rose
B. Mustard
C. Dianthus
D. Pea
Answer: C
Explanation: Dianthus has free central placenta.
39. Basal placentation is found in
A. Sunflower
B. Tomato
C. Mustard
D. Pea
Answer: A
Explanation: Sunflower has basal placentation.
40. Aestivation refers to
A. Ovule arrangement
B. Leaf arrangement
C. Petal arrangement in bud
D. Seed arrangement
Answer: C
Explanation: Aestivation = arrangement of sepals/petals.
41. Valvate aestivation shows
A. Overlapping margins
B. Twisted petals
C. Margins just touching
D. Irregular overlap
Answer: C
Explanation: In valvate, margins touch but do not overlap.
42. Twisted aestivation is seen in
A. Mustard
B. China rose
C. Pea
D. Calotropis
Answer: B
Explanation: China rose shows twisted aestivation.
43. Imbricate aestivation is seen in
A. Pea
B. China rose
C. Cassia
D. Mustard
Answer: C
Explanation: Cassia shows imbricate aestivation.
44. Vexillary aestivation is characteristic of
A. Brassicaceae
B. Solanaceae
C. Papilionaceae
D. Malvaceae
Answer: C
Explanation: Papilionaceous flowers show vexillary type.
45. Standard, wings and keel are parts of
A. Calyx
B. Corolla
C. Androecium
D. Gynoecium
Answer: B
Explanation: These are petals of papilionaceous corolla.
46. The female gametophyte develops inside
A. Ovary
B. Ovule
C. Anther
D. Style
Answer: B
Explanation: Embryo sac develops inside ovule.
47. Bract is a
A. Modified root
B. Modified stem
C. Modified leaf
D. Modified flower
Answer: C
Explanation: Bracts are modified leaves.
48. A flower without bracts is
A. Bracteate
B. Ebracteate
C. Complete
D. Incomplete
Answer: B
Explanation: Ebracteate = no bract.
49. Presence of both calyx and corolla separately is
A. Perianth
B. Dichlamydeous
C. Monochlamydeous
D. Achlamydeous
Answer: B
Explanation: Dichlamydeous flowers have both.
50. A flower lacking both calyx and corolla is
A. Monochlamydeous
B. Dichlamydeous
C. Achlamydeous
D. Perianth
Answer: C
Explanation: Achlamydeous = no protective whorls.
