Physiology of Plants MCQs Part 11

1) Knots occur in wood due to
a) Injuries produced by animals
b) Embedding of branch bases in stem due to secondary growth in the latter
c) Branch scars
d) Leaf scars

2) The first to occur during the secondary growth of a dicot root is
a) Cambium present in between xylem and phloem becomes active
b) Cambium is formed from pericycle opposite protoxylem points
c) Conjuctive parenchyma becomes meristematic
d) A wavy cambium is formed

3) Bulliform or motor cells occur in the
a) Upper epidermis of dicot leaves
b) Upper epidermis of monocot leaves
c) Lower epidermis of monocot leaves
d) Lower epidermis of dicot leaves

4) The innermost layer of cortex is the
a) Endodermis
b) Epidermis
c) Exodermis
d) Hypodermis

5) The meristem present in a vascular bundle is
a) Fascicular/Intrafascicular cambium
b) Interfascicular cambium
c) Phellogen
d) Procambium

6) A hundred year old tree of a temperate area will show
a) Irregular number of rings which show increase or decrease along the length
b) More than 100 rings at the base and less than 100 near the top
c) 100 rings at the base and progressive decrease towards the top
d) 100 rings from base to top

7) In monocots
a) Leaves have reticulate venation
b) Stems have annual rings
c) Seeds have two storage organs
d) Stems have scattered conducting strands

8) Kranz anatomy is found in case of a
a) Flower
b) Root
c) Leaf
d) Stem

9) The narrow layer of thin walled cells found between phloem/bark and wood of a dicot is the
a) Cork cambium
b) Vascular cambium
c) Endodermis
d) Pericycle

10) Annual rings are found in
a) Monocot stems
b) Dicot stems
c) Monocot roots
d) Dicot roots

11) Protoxylem lacunae occur in
a) Grass stem vascular bundles
b) Cladodes
c) Underground stems
d) Climbers

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

13) Bhojpatra is got from bark of
a) Dalbergia
b) Cinchona
c) Piper
d) Betula

14) Secondary growth occurs in a dicot stem due to
a) Phloem
b) Medullary rays
c) Cambium
d) Xylem

15) The piliferous layer of a root is actually the
a) Pericycle
b) Endodermis
c) Conjunctive parenchyma
d) Epidermis

16) Vascular bundles are closed when they
a) Have cambium
b) Lack cambium
c) Lack pericycle
d) Lack endodermis

17) Bicollateral vascular bundles have tissues arranged as follows:
a) Outer phloem-Outer cambium-Middle xylem-Inner cambium-Inner phloem
b) Out xylem-Outer cambium-Middle phloem-Inner cambium-Inner xylem
c) Outer phloem-Outer xylem-Middle cambium
d) Outer cambium-Outer phloem-Middle xylem-Inner phloem-Inner cambium

18) Fascicular, interfascicular and extra-fascicular cambium together constitute
a) Ground meristem
b) Lateral meristem
c) Intercalary meristem
d) Primary meristem

19) Passage cells are thin walled cells found in
a) Phloem elements to serve as entry points
b) Testa of seeds for emergence of embryonal axis
c) Central area of style for passage of pollen tube
d) endodermis of roots to facilitate rapid transport of water from cortex to pericycle

20) The force which determines the flow of water from one cell to another is
a) T.P.
b) D.P.D.
c) O.P.
d) W.P.

21) When a cell is fully turgid, which of the following will be zero?
a) Turgor pressure/pressure potential
b) Wall pressure
c) Suction pressure/DPD/water potential
d) Osmotic pressure (solute pressure)

22) Stomata open at night and close during the day time in
a) Xerophytes
b) Mesophytes
c) Succulents
d) Hydrophytes

23) The frequency and position of stomata can be determined by
a) Cobalt chloride paper
b) Potometer
c) Porometer
d) Measuring water loss

24) Phenyl mercuric acetate (PMA)spraying results in
a) Reduced photosynthesis
b) Reduced transpiration
c) Reduced respiration
d) Killing of plants

25) The element involved in stomatal regulation is
a) Zinc
b) Magnesium
c) Potassium
d) Iron

26) The transpiration-cohesion tension theory operates in
a) Active absorption
b) Passive absorption
c) Both active and passive absorption
d) None of the above

27) The most widely accepted theory for ascent of sap in trees is
a) Capillarity
b) Role of atmospheric pressure
c) Pulsating action of living cell
d) Transpiration pull and cohesion theory of Dixon and Joly

28) Hydathodes occur on the
a) Stem
b) Leave
c) Roots
d) All the above

29) Dry wooden stakes driven in cracks of a rock and soaked will develop a pressure that will split the rock. The phenomenon is called
a) Osmotic pressure
b) Imbibition
c) Turgor pressure
d) Deplasmolysis

30) Root pressure helps in the ascent of sap by
a) Pumping food in phloem
b) Pumping sap into xylem in roots
c) Pumping sap in stem for sending it to roots
d) All the above

31) Which one is correct?
a) £Zm = £Zp+£Zs+£Zw
b) £Zw = £Zp+£Zs+£Zm
c) £Zp = £Zw+£Zm+£Zs
d) £Zw = £Zw+£Zp+£Zp+£Zs

32) Choose the correct sequence of events during wilting:
a) Exosmosis, deplasmolysis, temporary wilting, permanent wilting
b) Exosmosis, plasmolysis, temporary wilting, permanent wilting
c) Endosmosis, plasmolysis, temporary wilting, permanent wilting
d) Exosmosis, deplasmolysis, temporary wilting, permanent wilting

33) The cohesion force existing amongst water molecules contributes to
a) Plasmolysis
b) Ascent of sap
c) Osmosis
d) Translocation

34) A cell with DPD – 5 is surrounded by A, B, C and D cells having OP and TP respectively 5 and 4, 7 and 5, 3 and 2, and zero and zero. From which cell will it withdraw water faster?
a) D
b) C
c) B
d) A

35) Water potential is maximum in case of
a) Pure water
b) 2 % glucose
c) 10% glucose
d) 10% NaCl

36) Little leaf/leaf rosetting is a deficiency symptom of
a) Zn
b) Mn
c) Fe
d) B

37) Minerals absorbed by roots move to the leaf through
a) Xylem
b) Phloem
c) Sieve tubes
d) None of the above

38) The importance of microelements was recognised late due to
a) Their toxicity
b) Their presence as contaminants in macronutrients
c) Their absence in plant ash
d) Leakage from the roots

39) Major nitrogen fixation is carried out by
a) Lightning
b) Chemical industries
c) Symbiotic bacteria
d) Leaching

40) Active transport from outside to inside of molecule across a membrane requires
a) Cyclic AMP
b) Acetyl choline
c) ATP
d) Phloroglucinol

41) A phytotron is meant for
a) Controlled irradiation
b) Induction of mutations
c) Controlled humidity
d) Growing plants under controlled environment

42) Which one is an essential mineral, not a constituent of any enzyme but stimulates the activity of many enzymes?
a) Zn
b) MN
c) K
d) Mg.

43) Brown heart disease is due to the deficiency of
a) Iron
b) Boron
c) Potassium
d) Molybdenum

44) Premature leaf fall is due to the deficiency of
a) Potassium
b) Sodium
c) Phosphorus
d) Zinc

45) Which of the following is a reservoir of sulphur?
a) Rocks
b) Oceans
c) Atmosphere
d) Lakes

46) Copper is an activator of the enzyme
a) Carbonic anhydrase
b) Tryptophanase
c) Lactic dehydrogenase
d) Tyrosinase

47) If the size of fruits diminishes in plants which mineral ion should be added to the soil?
a) Calcium
b) Chlorine
c) copper
d) Boron

48) Chlorosis occurs when plants are grown in
a) Shade
b) Strong sunlight
c) Fe-free medium
d) Dark

49) Photosynthesis is fastest in
a) Blue light
b) Sun light
c) Red light
d) Green light

50) The first scientist to find out the role of light in photosynthesis was
a) Ingenhousz
b) Senebier
c) Priestley
d) Sachs

51) The first step in photosynthesis is the
a) Joining of 3-carbon atoms to form Glucose
b) Formation of ATP
c) Ionization of water
d) Excitement of an electron of chlorophyll by photon of light

52) Photophosphorylation means the synthesis of
a) ATP from ADP
c) ADP from ATP
d) PGA

53) The discovery of the Emerson effect has clearly shown the existence of
a) Two distinct photochemical reactions or processes
b) Light and dark reactions in photosynthesis
c) Photophosphorylation
d) Photo-respiration

54) Which of the following wave lengths of light is absorbed maximally for photosynthesis?
a) 660 nm
b) 440 nm
c) 680 nm
d) 700 nm

55) Where does the primary photo-chemical reaction occur in a chloroplast?
a) Stroma
b) Periplast cavity
c) Quantasomes
d) Inner membrane of chloroplast

56) At which wavelength of light do bacteria carry out photosynthesis?
a) Ultra violet
b) Blue
c) Red
d) Far-red (Near infrared)

57) The two pigment system theory of photosynthesis was proposed by
a) Hill
b) Blackman
c) Emerson
d) Arnon

58) Which one is a C4-plant?
a) Papaya
b) Pea
c) Potato
d) Maize/Corn

59) During day-light hours the rate of photosynthesis is higher than that of respiration and the ratio of O2 produced to that of consumed is
a) 1:1
b) 10:1
c) 50:1
d) 5:1

60) The red drop phenomenon discovered by Emerson is due to the disruption of photochemical activity of
a) Carotenoids
b) PS I
c) PS II
d) Both B and C

61) Nine-tenth of all photosynthesis in the world (85-90%) is carried out by
a) Large trees with millions of branches and leaves
b) Algae of the ocean
c) Chlorophyll containing ferns of the forest
d) Scientists in the laboratories

62) Glycolate accumulates in chloroplasts when there is
a) High CO2
b) Bright light
c) Low temperature
d) Low CO2

63) Starch is insoluble in water. Yet it accumulates in large quantities in a potato because
a) It is synthesized in potato tuber itself
b) It is translocated from the leaves to the tuber in the form of sugar
c) Soil micro-organisms deposit starch in tuber
d) It is useful for consumption

64) Moll’s experiment shows
a) Unequal transpiration from two surfaces of leaf
b) CO2 is essential for photosynthesis
c) Relation between transpiration and absorption
d) Chlorophyll is essential for photosynthesis

65) PEP is a CO2 acceptor in
a) C4 plants
b) C3 plants
c) C2 plants
d) Both A and B

66) The compensation point is the value of a factor at which there is
a) The beginning of photosynthesis
b) Little photosynthesis
c) Photosynthesis equal to rate of respiration
d) Neither photosynthesis nor respiration

67) Thylakoids removed from chloroplasts were kept in an illuminated culture containing CO2 and water. It did not produce sugar because of the
a) Absence of enzymes
b) Nonlinking of PS I and PS II
c) Absence of light trapping
d) Nonformation of assimilatory power

68) Carbon dioxide joins the photosynthetic pathway in
a) PS I
b) PS II
c) Light reaction
d) Dark reaction

69) Sugarcane shows high efficiency of CO2 fixation because it performs
a) Calvin cycle
b) EMP pathway
c) Hatch and Slack pathway
d) TCA cycle

70) Who proved that oxygen evolved in photosynthesis comes from water?
a) Mayer
b) Calvin
c) Ruben, Hassid and Kamen
d) Blackman

71) Cyclic photophosphorylation is carried out by
a) PS I
b) PS II
c) Both A and B
d) Photolysis and PS II

72) At high oxygen concentrations, the rate of photosynthesis decreases due to the
a) Warburg effect
b) Pasteur effect
c) Emerson effect
d) Richmond Lang effect

73) Photo-oxidation or photolysis of water (in photosynthesis) occurs in association of
a) Cytochrome B6
b) Plastocyanin
c) PS II
d) PS I

74) CAM occurs in
a) Thin green leaves with reticulate venation
b) Thin green leaves with parallel venation
c) Thin coloured leaves
d) Fleshy green leaves

75) Quantasomes occur on the surface of
a) Cristae
b) Plasmalemma
c) Nuclear envelope
d) Thylakoids

76) A photosystem has the main light harvesting pigments
a) Chlorophyll a-660, chl a-670, chl a-680, chl a-690, chl a-700
b) Chlorophyll a-660, chl b, chl a-700, chl a-800 and carotenoid
c) Chlorophyll a-680, chl a-685, chl a-695 and xanthophyll
d) Chlorophyll a-700, chl a-880, chl-b, chl a-685 and phycobilins

77) In a green cell the enzyme catalase is localised in the
a) Peroxisomes
b) Chloroplasts
c) Lysosomes
d) Vacuoles

78) The direction of conduction of food through phloem is
a) From below upwards
b) from tip to bottom
c) from leaves to roots
d) Phloem never conducts food

79) Photolithotrophs (photoautotrophs) obtain energy from
a) Radiations and carbon from inorganic compounds
b) Radiations and carbon from organic compounds
c) organic compounds
d) Inorganic compounds

80) The electrons lost by PS II are regained from
a) O2
b) CO2
c) H2O
d) None of the above

81) Plants showing C4 photosynthesis have
a) Granal bundle sheath chloroplasts and agranal mesophyll chloroplasts
b) Agranal bundle sheath chloroplasts and granal mesophyll chloroplasts
c) Both bundle sheath and mesophyll chloroplasts are agranal
d) Both the types of chloroplasts are granal

82) The first step in the dark reaction of photosynthesis is
a) Formation of ATP
b) Attachement of carbon dioxide to a pentose sugar
c) Excitement of an electron of chlorophyll by photon of light
d) Ionisation of water

83) Which one is false about the Kranz anatomy?
a) It is found in Atriplex
b) Bundle sheath cells have large chloroplasts and less developed grana
c) Mesophyll cells have large chloroplasts and more developed grana
d) The plants with Kranz anatomy have better photosynthetic power than C3 plants

84) Which of the following is the most common H+ acceptor?
a) FAD and NAD+
b) FMN and NAD+
c) FMN and FAD
d) NAD+ and NADP+

85) In which of the following is substrate level phosphorylation not seen?
a) 1, 3-biphosphoglyceric acidÝ3-phosphoglyceric acid
b) Glucose 6-phosphateÝFructose 6-phosphate
c) Succinyl CoAÝSuccinic acid
d) Phosphoenol pyruvic acidÝPyruvic acid

86) Solarisation is the
a) Formation of chlorophyll
b) Destruction of chlorophyll
c) Utilisation of sunlight
d) effect of solar light

87) The girdling experiment is not successful in monocots since
a) Vascular bundles are not arranged in a ring
b) Vascular bundles are arranged in a ring
c) Vascular bundles are radial
d) Non of the above

88) Four electrons produced during the photolysis of water will enter
a) PSI
b) PQ
d) PC

89) The Munch hypothesis is based on translocation of food due to
a) Imbibition force
b) Turgon pressure (TP) gradient
c) Both A and B
d) None of these

90) The reactions of the Krebs cycle take place
a) In the cytoplasm
b) In ER
c) In matrix of mitochondria
d) On the surface of mitochondria

91) The conversion of pyruvic acid into ethyl alcohol is facilitated by the enzyme
a) Decarboxylase
b) Dehydrogenase
c) Decarboxylase and dehyrogenase
d) Phosphatase

92) Enzymes taking part in glycolysis are present in
a) Mitochondria
b) Cytoplasm
c) Both mitochondria and cytoplasm
d) Vacuole

93) Most of the energy in the cells is liberated by oxidation of carbohydrates when
a) Pyruvic acid is converted into CO2 and H2O
b) Pyruvic acid is converted into acetyl CoA
c) Sugar is converted into pyruvic acid
d) Glucose is converted into alcohol and CO2

94) The net gain of energy from one gram mole of glucose during aerobic respiration is
a) 2 ATP
b) 4 ATP
c) 38 ATP
d) 40 ATP

95) The universal hydrogen acceptor is
a) NAD
b) ATP
c) CoA
d) FMN

96) In the process of respiration in plants 180 g of glucose plus 192 g of oxygen produce
a) 132 g of CO2, 54g of water and 343 Cal. of energy
b) 264 g of CO2, 108 g of water and 686 Cal. of energy
c) 528 g of CO2, 216 g of water and 1372 Cal. of energy
d) Large amount of CO2, no water and no energy

97) The respiration of young maturing seeds is quite high but as water content decreases during maturation, the rate of respiration
a) Remains high
b) Stops completely
c) Increases steadily
d) Decreases steadily

98) The final electron acceptor in respiration is
a) Hydrogen
b) Oxygen
c) Cytochromes
d) Dehydrogenases

99) The hexose monophosphate shunt is
a) Transformation of glucose to pyruvic acid
b) Formation of new products
c) Sum total of metabolic reactions
d) Pentose phosphate pathway

100) In Opuntia and other succulents, night time R.Q. is
a) One
b) More than one
c) Zero
d) Less than one



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