Diversity of Plant Life MCQs Part 12

1) A vascular bundle in which the protoxylem faces towards the periphery is

a) Exarch
b) Endarch
c) Mesarch
d) Centrarch

2) The character of a monocot stem is
a) Net-veined leaves
b) Annual rings
c) Seeds with two masses of stored food
d) Conducting strands scattered throughout the ground tissue

3) The basic difference between a stem and root is that the stem is
a) Endarch
b) Exarch
c) Mesarch
d) Polyarch

4) What arrangement of vascular tissue is characteristic of roots?
a) Conjoint, endarch
b) Radial, exarch
c) Radial, endarch
d) Conjoint, exarch

5) Radial exarch condition occurs in the
a) Leaf
b) Root
c) Maize stem
d) Fern stem & petiole

6) Radial vascular bundles are found in the
a) Angiospermic stem
b) Angiospermic root
c) Angiospermic leaf
d) Angiospermic seed

7) Radial vascular bundles occur in
a) Stems
b) Monocot shoots
c) Monocot roots and dicot shoots
d) Dicot roots and monocot roots

8) The T.S. of a material exhibits conjoint collateral endarch and closed bundles
scattered in a ground tissue. What is the material?

a) Monocot root
b) Dicot root
c) Monocot stem
d) Dicot stem

9) Innumerable vascular bundles, lack of cambium & lack of a well demarcated
pith is found in

a) Sugarcane
b) Sunflower
c) Radish
d) Pea

10) Grafting is not possible in monocot plants like sugarcane, because
a) Vascular bundles are scattered
b) Cambium is absent
c) Endodermis is absent & plants are herbaceous
d) Bundle sheath is sclerenchymatous

11) In a graft between stock & scion, the structure first developed
is the

a) Vascular tissue
b) Wall
c) Callus
d) Plasmodesmata

12) Cortex & pith are not distinguished in a
a) Monocot stem
b) Monocot root
c) Dicot stem
d) Dicot root

13) Phloem parenchyma is absent in a
a) Dicot stem
b) Dicot leaf
c) Monocot stem
d) Dicot root

14) A sclerenchymatous bundle sheath is present in
a) Grass
b) Sunflower
c) Banyan
d) Gram

15) The lacunae in the vascular bundles of a monocot stem are
a) Metaxylem
b) mucilage canals
c) lysigenous cavities
d) large sized vessels

16) In a dicot root
a) Vascular bundles are scattered throughout the cambium
b) Vascular bundles are open and arranged in a ring
c) Xylem and phloem are radial
d) Xylem is always endarch

17) Less than six radial vascular bundles are present in a
a) Monocot stem
b) Dicot stem
c) Monocot root
d) Dicot root

18) A plant structure with three radial vascular bundles would be a
a) Monocot stem
b) Dicot stem
c) Monocot root
d) Dicot root

19) The tissue separating the primary xylem and the primary phloem of a dicot
stem is

a) Cork cambium
b) Procambium
c) Interfascicular cambium
d) Fascicular cambium

20) Which of the following is not a true difference between a stem and a

a) The largest xylem vessel lies towards the outside in the stem and the inside in a root
b) The xylem and phloem tissues are arranged on the same radii in the stem while they alternate in a root
c) the pith is the widest tissue in a dicot root and the cortex is widest in a dicot stem
d) None of the above

21) Bordered pits occur in
a) Sieve tube members
b) Sieve cells members
c) Vessel members
d) Companion cells

22) Which dorsiventral leaf has a multilayered epidemis?
a) Mulberry
b) Banyan
c) Nerium
d) Eucalyptus

23) In an isobilateral leaf, the stomata are generally found in
a) the upper epidermis
b) the lower epidermis
c) In both the above
d) None of the above

24) In which of the following does the phloem occur in two patches?
a) Maize
b) Cucurbita
c) Sunflower
d) Dracaena

25) The vascular bundles in a Cucurbita root are
a) Collateral
b) Bicollateral
c) Radial
d) Open/Closed

26) In leaves, the vascular bundles are
a) Bicollateral and open
b) Collateral and open
c) Collateral and closed
d) Radial and exarch

27) Mesophyll is well differentiated in
a) Dicot leaves
b) Monocot leaves
c) Submerged hydrophytes
d) Halophytic stems

28) The protoxylem in a dorsiventral leaf is directed towards the
a) Upper epidermis
b) Lower epidermis
c) Centre
d) Anywhere

29) In a dorsiventral leaf, the phloem is present towards the
a) Lower epidermis
b) Upper epidermis
c) Both
d) None of the above

30) Monocot leaves are characterised by
a) the lack of differentiation between palisade and spongy tissue
b) the permanently opened stomata
c) the absence of bulliform cells
d) the phloem on the abaxial side

31) Leaves fall from branches on account of the
a) Completion of their life
b) Formation of an abscission layer
c) Formation of calyptrogen
d) Fall in atmospheric temperature

32) Which of the following is not found on leaves?
a) Lenticels
b) Hydathodes
c) Phloem and guard cells
d) Stomata cells

33) The vascular cambium in dicots is
a) Lateral
b) Apical
c) Intercalary
d) Secondary

34) Vascular cambium gives rise to
a) Xylem and phloem
b) Xylem, phloem and vascular rays
c) Xylem and medullary rays
d) Phloem and bark

35) Intrafascicular cambium is situated
a) In between the vascular bundles
b) Inside the vascular bundles
c) Outside the vascular bundles
d) In the pith

36) Which of the following is responsible for growth in circumference of
the stem or root?

a) Cortex
b) Cambium
c) Xylem
d) Phloem

37) Why is cambium considered a lateral meristem?
a) Because it gives rise to lateral branches
b) Because it causes growth in girth
c) Because it increases height and diameter of a plant
d) Because it adds height to a plant

38) Which of the following types of cells constitute a vascular cambium ?
a) Fusiform and ray initials
b) Xylem and phloem
c) Parenchyma and collenchyma
d) Cork initials

39) Fusiform initials form
a) Tracheary elements
b) Vascular rays
c) Phloem parenchyma
d) Ray parenchyma

40) Vascular cambium gives rise to
a) Only xylem
b) Only phloem
c) Xylem and phloem both
d) Secondary xylem, secondary phloem and vascular rays

41) Metabolic energy is most extensively used in
a) Phloem
b) Cork
c) Cambium
d) Tracheids

42) Secondary xylem (or) the youngest layer of secondary xylem in a 5 years
old dicot stem lies

a) Just outside the cambium
b) Just inside the cambium
c) Adjacent to pith
d) Adjacent to cortex

43) The youngest layer (or newly formed cells) of secondary phloem in a
dicot stem lie

a) Inside the primary phloem
b) Just outside the xylem
c) Outside the vascular cambium
d) Inside the vascular cambium

44) Girdling or removal of a ring of tissue outside the vascular cambium
(i.e., bark) from a tree trunk kills it because

a) Water cannot move up
b) Food does not travel down and the root becomes starved
c) the shoot becomes starved
d) Annual rings are not produced

45) The girdling experiment has no effect in sugarcane because the
a) Vascular bundles are collateral
b) Vascular bundles are scattered
c) Vascular bundles are closed
d) Cortex and pith are not demarcated

46) Which of the vascular elements are blocked in the winter season by the appearance
of callus?

a) Tracheids
b) Vessels
c) Sieve tubes
d) Companion cells

47) The presence of lignin in the cell wall is characteristic of
a) Cork
b) Phloem
c) Woody tissue
d) All kind of tissues

48) In a dicot root, the major portion of the vascular cambium is derived from the
a) Pericycle
b) Cortex
c) Hypodermis
d) Epiblema

49) Which of the following is a secondary meristem?
a) Interfascicular cambium
b) Cambium of root
c) Cork cambium
d) All the above

50) Wood is the common name for
a) Vascular bundles
b) Secondary xylem
c) All the tissues which form a plant body
d) Phloem

51) Timber is
a) Secondary xylem
b) Cork
c) Secondary phloem
d) Secondary cortex

52) Grafting is not possible in monocots because they
a) Lack cambium
b) Have scattered vascular bundles
c) Are herbaceous
d) Have parallel veins

53) Cork cambium is an example of a/an
a) Apical meristem
b) Intercalary meristem
c) Primary meristem
d) Lateral meristem

54) Cork cambium is otherwise called
a) Phellem
b) Phelloderm
c) Phellogen
d) Periderm

55) In a dicot stem, the cork cambium develops from the
a) Epidermis
b) Pericycle
c) Cortex
d) Vascular bundles

56) The cork-cambium or phellogen usually originates from the
a) Inner cells of the cortex
b) Outer cells of the cortex
c) Any cell of the cortex
d) Fascicular and interfascicular cambium

57) The cork of dicots is a derivative of the
a) Phellogen
b) Vascular cambium
c) Pholem
d) Xylem

58) Another term for cork is
a) Phellogen
b) Phelloderm
c) Periderm
d) Phellem

59) The “Cork” of commerce is obtained from the
a) Cork oak
b) Mango tree
c) Ficus religiosa (Peepal)
d) Pinus

60) Cork cells have a major component of
a) Lignin
b) Suberin
c) Pectin
d) Cellulose

61) Cork cells are
a) Meristematic
b) Dead
c) Living
d) Photosynthetic

62) Cork is an excellent material for making bottle cork because it is
a) Easily available
b) Cheap
c) Air- and water-tight
d) Light

63) Which plant product is used in the manufacture of cricket balls?
a) Phellem of Quercus
b) Wood of Acacia
c) Phellem of Albizia
d) Wood of Tectona

64) Bark includes
a) all the tissues outside the vascular cambium
b) the tissue inside the vascular cambium
c) the tissue inside the xylem
d) all the dead tissue outside the vascular cambium

65) Which of the following statements is wrong?
a) Primary growth causes increase in height whereas secondary growth
accounts for increase in diameter

b) The cambium is composed of two kinds of initials
c) The bark is a tissue outside the cortex
d) In woody plants cambium functions for a few years

66) Which would do maximum harm to a tree?
a) The loss of half of its leaves
b) The loss of half of its branches
c) The loss of all of its leaves
d) The loss of all its bark

67) If a stem is girdled
a) The root dies first
b) The shoot dies first
c) Both die together
d) None of the above would die

68) The periderm includes
a) Cork cambium, cork and secondary cortex
b) Cork cambium and cork
c) Cork
d) Cork and secondary phloem

69) Periderm is made up of
a) Phellem, Phellogen, Phelloderm
b) Phellem
c) Phellogen
d) Phelloderm

70) A lenticel and its complementary cells are developed through the activity
of the

a) Phellogen
b) Phelloderm
c) Bark
d) Phellem

71) Lenticels and hydathodes are small pores with the following common attributes:
a) Their opening and closing is not regulated
b) They allow exchange of gases
c) They always remain closed
d) They are found on the same organ of plants

72) Lenticels are found in
a) Monocot stems
b) Dicot stems
c) Monocot leaves
d) Dicot roots and petioles

73) A lenticel is a loose mass of cells in cork tissue meant for
a) Protection
b) Respiratory exchange of gases
c) Absorption of moisture from the air
d) Exclusion of germs

74) Sapwood differs from heartwood in being
a) Darker and non conducting
b) Softer and non conducting
c) Lighter and conducting
d) Harder, darker and less conducting

75) Which is incorrect as regards heartwood?
a) It is made up of living tissues
b) It forms the central cylindrical core
c) It contains gums and resins
d) It provides mechanical support

76) As a tree grows older, which of the following increases rapidly?
a) Heartwood
b) Sapwood
c) Pith
d) Cortex

77) In summer, the cambium
a) Dies
b) Becomes more active
c) Becomes less active
d) Becomes inactive

78) Most of our trees grow faster in
a) Autumn
b) Winter
c) Summer
d) Spring

79) Annual rings and growth rings are formed due to the fluctuations in
the activity of

a) Xylem
b) Phloem
c) Xylem and phloem
d) Cambium

80) Annual rings are the bands of
a) Secondary cortex and cork
b) All secondary vascular tissues
c) Secondary xylem and xylem rays
d) Secondary phloem and medullary rays

81) The formation of distinct annual rings in the stem mainly depends upon
a) Formation of cork cambia
b) Contrasting seasonal variations
c) Uniform climatic conditions
d) Formation of unequal phloem and xylem

82) Annual rings are quite distinct in plants growing in the
a) Tropical region
b) Equatorial region
c) Temperate region
d) Arctic region

83) Trees growing in deserts will
a) Show alternate rings of xylem and sclerenchyma
b) Show distinct annual rings
c) Not show distinct annual rings
d) Have only conjunctive tissue and phloem formed by the activity of cambium

84) A timber merchant told his customer that the log of wood which he was purchasing
came from a 20 year old tree. He knew this by inspecting the

a) Diameter of log
b) Thickness of the heart wood
c) Number of cork layers
d) Growth rings

85) Dendrochronology is the study of the
a) Height of a tree
b) Diameter of a tree
c) Age of a tree with the help of annual rings
d) Counting of the number of branches

86) The process by which the plant becomes woody is called
a) Calcification
b) Lignification
c) Impregnation
d) Fossilisation

87) In old dicot stems, a major part of the wood is filled up with tannins,
resins, gums etc., and this part is called

a) Heartwood
b) Sapwood
c) Hard wood
d) Soft wood

88) Sapwood is synonymous with the
a) Outer part of the secondary xylem
b) Inner part of secondary xylem
c) Periderm
d) Bark

89) Compact wood with little parenchyma is termed
a) Heartwood
b) Hard wood
c) Pycnoxylic wood
d) Manoxylic wood

90) Porous and hard wood plants belong to
a) Gymnosperms
b) Monocots
c) Dicots
d) Pteridophytes

91) Non-porous and soft wood plants are
a) Gymnosperms
b) Monocots
c) Dicots
d) Ferns

92) Which of the following has non-porous wood?
a) Mangifera
b) Palm
c) Ficus
d) Pinus

93) Abnormal secondary growth is observed in
a) Dracaena
b) Wheat
c) Ginger
d) Rice

94) Which will decay faster if exposed freely to the air?
a) Heartwood
b) Sapwood
c) Wood with lots of fibres
d) Soft wood

95) In which tissue are the plastids never present?
a) Parenchyma
b) Aerenchyma
c) Collenchyma
d) Sclerenchyma

96) The tissue which is conspicuously absent from monocot stems and all
roots is

a) Parenchyma
b) Collenchyma
c) Chlorenchyma
d) Sclerenchyma

97) The edible part of a pear fruit is gritty due to the presence of
a) Stone cells
b) Fibres
c) Parenchyma
d) Collenchyma

98) A branched sclerenchymatous cell is called a
a) Sclereid
b) Stone cell
c) Libriform fibre
d) Tracheidal fibre

99) The root tip is different from the stem tip in having
a) A meristematic zone
b) Procambial strands
c) Calyptrogen
d) Ground meristem

100) A few organisms are known to grow and multiply at temperature of 100-108 degree C. They belong to
a) Thermophilic sub-areal fungi
b) Marine archeobacteria
c) Thermophilic sulphur bacteria
d) Hot spring blue green algae (cyanobacteria)


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