Secondary Growth in Root & Stem of Dicot (Sunflower) Multiple Choice Questions
1. Growth that increase the girth and thickness of the plant is called
(a) primary growth
(b) secondary growth
(c) tertiary growth
(d) None of these
Ans. b
2. The secondary growth in dicot roots takes place both in stellar and extrastellar region by
(a) cork cambium only
(b) cork cambium and vascular cambium
(c) vascular cambium and cork cambium
(d) None of the above
Ans. c
3. Cambium produces secondary xylem towards and secondary phloem towards….
(a) outside and inside
(b) inside and outside
(c) outside only
(d) None of the above
Ans. b
4. Cork cambium is also called
(a) phellem
(b) phellogen
(c) phelloderm
(d) All of these
Ans. b
5. Vascular cambium becomes meristematic in dicot stem and form new secondary meristem called
(a) primary cambium
(b) tertiary cambium
(c) interfascicular cambium
(d) None of these
Ans. c
6. Cells of cambium in dicot stem divides
(a) anticlinally
(b) periclinally
(c) Both (a) and (b)
(d) None of these
Ans. b
7. Phellem, phellogen and phelloderm are together called
(a) cork
(b) cork cambium
(c) vascular bundles
(d) periderm
Ans. d
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8. Aerating pores found in the bark of stem of dicot plants are called
(a) stomata
(b) plasmodesmata
(c) guard cells
(d) lenticels
Ans. d
9. Lenticels serve or exchange the gases to and from atmosphere. They also help in
(a) photosynthesis
(b) respiration
(c) transpiration
(d) None of these
Ans. c
10. Cork cambium gives rise to
(a) phellogen and secondary cortex
(b) cork and phellogen
(c) cork and secondary cortex
(d) phellogen, phelloderm and secondary cortex
Ans. c
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11. Which of the following layers of cell lies above the protoxylem and also becomes meristematic forming the strip of cambium?
(a) Hypodermis
(b) Endodermis
(c) Pericycle
(d) None of these
Ans. c
12. During secondary growth, the tissue of endodermis, general cortex become
(a) disorganised
(b) sloughed off
(c) Both (a) and (b)
(d) None of these
Ans. c
13. The vascular cambial ring develop as a circular ring since beginning in dicot stem but in dicot root it is
(a) circular in beginning
(b) wavy in beginning and circular later on
(c) circular in beginning and wavy later on
(d) None of the above
Ans. b
14. The vascular rays are narrow in dicot stem, while in dicot root they are
(a) narrow in the beginning
(b) wider in the beginning
(c) narrow always
(d) None of the above
Ans. b
15. When bark is removed, phloem gets damaged first and root dies due to
(a) photosynthesis
(b) respiration
(c) starvation
(d) guttation
Ans. c
16. Secondary growth occurs in
(a) bryophytes
(b) gymnosperms
(c) angiosperms
(d) Both (b) and (c)
Ans. d
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17. Secondary growth occurs in stellar region and
(a) non-stellar region
(b) extrastellar region
(c) Both (a) and (b)
(d) None of these
Ans. b
18. Outward layers of the cortex give birth to cork cambium in dicot stem while in dicot roots ……. gives birth to cork cambium.
(a) endodermis
(b) xylem
(c) pericycle
(d) Both (a) and (b)
Ans. c
19. The thickness produced by secondary growth is due to the following type of activity of cambium
(a) more division of cambium inside
(b) more division of cambium outside
(c) equal division of cambium on both sides
(d) None of the above
Ans. c
20. Quercus suber is economically important due to the extraction/production of
(a) antibiotics
(b) single cell protein
(c) commercial cork
(d) All of these
Ans. c
21. Abnormal secondary growth is seen in
(a) Triticum
(b) Cucurbita
(c) Dracaena
(d) Helianthus
Ans. c
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22. The cells of cambial ring are known as
(a) ray initials
(b) interfascicular initials
(c) fusiform initials
(d) Both (a) and (c)
Ans. d
23. Lenticels are formed due to the rupture of
(a) sclerenchymatous cells
(b) parenchymatous cells
(c) Both (a) and (b)
(d) collenchymatous cells
Ans. b
24. The components of a vascular bundle develops from… of the primary meristem.
(a) procambial strands
(b) paravascular fibres
(c) vascular cryptogams
(d) monocat roots
Ans. a
25. Medullary vascular bundles commonly occur in the members of the family
(a) Brassicaceae
(b) Malvaceae
(c) Amaranthaceae
(d) Cucurbitaceae
Ans. c
26. For a critical study of secondary growth in plants, which one of the following pairs is suitable?
(a) Wheat and maiden hair fern
(b) Sugarcane and sunflower
(c) Teak and pine
(d) Deodar and fem
Ans. c
27. Interfascicular cambium is a
(a) type of protoderm
(b) primordial meristem
(c) primary meristematic tissue
(d) secondary meristematic tissue
Ans. d
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28. Identity the plant parts whose transverse sections show a clear and prominent pith.
(a) Dicot stem and monocot stem
(b) Dicot stem and dicot root
(c) Dicot root and monocot root
(d) Dicot stem and monocot root
Ans. d
29. Which one of the following is the correct sequence of tissues present in dicot stem during secondary growth?
(a) Primary cortex, secondary cortex, phellogen, cork
(b) Cork, primary cortex, secondary cortex, phellogen
(c) Phellogen, cork, primary cortex, secondary cortex
(d) Secondary cortex, cork, phellogen primary cortex
Ans. a
30. Ina dicotyledonous stem, the sequence of tissues from the outside to the inside is
(a) phellem-phloem-endodermis-phloem
(b) phellem-pericycle-endodermis-phloem
(c) phellem-endodermis-pericycle-phloem
(d) phellem-endodermis-pericycle-phloem
Ans. a
31. Which of the following gives rise to procambium?
(a) Vascular cambium
(b) Primary vascular bundle
(c) Cork cambium
(d) Both (a) and (c)
Ans. c
32. Vascular bundle in root takes place its origin in
(a) pericycle
(b) conjunctive parenchyma
(c) Both (a) and (b)
(d) None of these
Ans. c
33. Secondary growth in dicot stem is the activity of
(a) xylem
(b) cork cambium
(c) vascular cambium
(d) cambium ring
Ans. d
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34. Cork cambium and vascular cambium are the examples of
(a) lateral meristem
(b) intercalary meristem
(c) apical meristem
(d) wound tissue
Ans. a
35. Vascular tissue in flower develops from
(a) periblem
(b) dermatogen
(c) phellogen
(d) plerome
Ans. d
36. Which one of the following is the primary lateral meristem?
(a) Interfascicular cambium
(b) Intrafascicular cambium
(c) Cork cambium
(d) Phellogen
Ans. b
37. Old dicotyledonous root is distinguished from from dicotyledonous stem by
(a) the absence of secondary ph?oem
(b) the presence of cortex
(c) position of protoxylem
(d) the absence of secondary xylem
Ans. c
38. Which of the following pair is an example of lateral meristem ?
(a) Procambium and phelloderm
(b) Interfascicular cambium and phellem
(c) Phellogen and phelloderm
(d) Phellogen and fascicular cambium
Ans. d
39. Youngest layer of secondary xylem in wood of dicot plants is located between
(a) pith and primary xylem
(b) just outside vascular cambium
(c) just inside vascular cambium
(d) just inside cork cambium
Ans. c
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40. Between the bark and wood in a woody stem , there is a layer of meristem called
(a) cork cambium
(b) apical meristem
(c) vascular cambium
(d) zone of cell division
Ans. a
41. Cork cambium , cork and cortex are collectively called
(a) phelloderm
(b) phellogen
(c) periderm
(d) phellem
Ans. c
42. Which of the following is not a lateral meristem ?
(a) Intrafascicular cambium
(b) Interfascicular cambium
(c) Phellogen
(d) Intercalary meristem
Ans. c
43. During secondary growth in dicot root , phellogen form ……… towards outside .
(a) periderm
(b) secondary vascular tissue
(c) cork cambium
(d) phellem
Ans. d
44. In dicot roots , cork cambium originates in
(a) pith
(b) pericycle
(c) epidermis
(d) hypodermis
Ans. b
45. Secondavy growth absent in
(a) Funaria
(b) Sun flower
(c) Mangifera
(d) Cycas
Ans. a
46. In dicot stem secondary growth occurs due to activity of
(a) apical meristem
(b) laternal meristem
(c) intercalary meristem
(d) None of the above
Ans. b
47. The term wood refers to
(a) primary xylem
(b) secondary xylem
(c) protoxylem
(d) metaxylem
Ans. b
48. The difference between alburnum and duramen is the presence in the former of
(a) companion cell
(b) living cell
(c) race cell
(d) lighnified cell
Ans. b
49. Heartwood is
(a) outer part of secondary xylem
(b) outer part of secondary phloem
(c) inner part of secondary xylem
(d) inner part of secondary phloem
Ans. c
50. Secondary phloem remains functional generally
(a) for one year
(b) for less then one year
(c) for many year
(d) as long as plant alive
Ans. d
