Physiology of Plants MCQs Part 8

1) The plants
which perform photosynthesis are

a) Palm plants
b) Mango plants
c) Lichens
d) All the above

2) Which of the following is capable of performing photosynthesis at a high temperature i.e. at ?
a) Opuntia
b) Mango
c) Potato
d) None of these

3) What
is the
form of

a) T.C.
b) Q
d) None

4) The plants are different from plants in the
b) Type of end product of photosynthesis
c) Number of that are consumed in preparing sugar
d) Types of pigments involved in photosynthesis

5) Which of these pigments is yellow in colour?
a) Chlorophyll a
b) Chlorophyll b
c) Carotene
d) Xanthophyll

6) Why does the rate of photosynthesis decline at very strong light intensities?
a) Increased respiration
b) Decreased hydration
c) Photo-oxidation of chlorophyll
d) All the above

7) The
photosynthesis takes place in the

a) Roots only
b) Shoots only
c) All the cells of the plant
d) Chlorophyll containing cells only

8) How would chlorophyll appear in red light?
a) Red
b) Green
c) Black
d) Colourless

9) What are the two absorption maxima of chlorophyll a?
a) 400 and 500nm
b) 430 and 730 nm
c) 430 and 660 nm
d) 400 and 660 nm

10) Chlorophyll

a) All plants except fungi
b) all oxygen synthesizing plants
c) All photosynthetic plants
d) All types of plants

11) Chlorophyll a and b show maximum absorption in the
a) Blue region
b) Red region
c) Blue and red regions
d) Yellow and violet regions

12) Where does the primary photochemical reaction occur in a chloroplast?
a) Stroma
b) Periplast cavity
c) Quantasome
d) Inner membrane

13) Why is the dark reaction in photosynthesis called so?
a) It occurs more rapidly at night
b) It occurs only in shade
c) It does not require light
d) It cannot occur in the day time

14) What is the immediate source of energy for the dark reactions of photosynthesis?CORRECT IMAGE
a) A.T.P. and Coenzyme-II
b) Light
c) A.T.P. and reduced coenzyme-II

15) What concentration of is present in the atmosphere?
a) 0.03%
b) 0.30%
c) 3.00%
d) 30.0%

16) The enzymes of carbon assimilation and starch formation occur in the
a) Chloroplast
b) Grana
c) Thylakoids
d) Agranal substance

17) Which of these proteins is most abundant in the mesophyll of leaves?
a) Amylase
b) Protease
c) Nitrogenase
d) Carboxylase

18) Carbon

a) Carbohydrates
b) Carbon dioxide
c) Elemental carbon
d) Carbonates

19) Which

a) Phytochrome is a pigment that controls growth,photomorphogenesis and development of plants
b) Phytochrome is a photosynthetic pigment
c) Phytochrome is a phytohormone
d) Phytochrome is a regulatory protein that controls several dark-dependent developmental processes

20) Early studies on the pathway of fixation in plants were made during the 1940s in
a) Unicellular green algae by Calvin
b) Isolated chloroplast of spinach by Hill
c) Mesophyll cells of variegated leaves by Arnon
d) Bundle sheath cells of maize by Hatch and Slack

21) Sugar produced in photosynthesis is converted into starch in
a) All plants
b) The majority of plants
c) Algae only
d) Bacteria only

22) The

a) Glucose
b) Fructose-1-6-diphosphate
c) Ribulose-phosphate
d) Starch

23) The

a) Sugar
b) Starch
c) Protein
d) Fat

24) Chlorophyll

a) Photosynthetic prokaryotes
b) Photosynthetic eukaryotes
c) Both prokaryotes and eukaryotes

25) In succulent xerophytes, there is accumulation of malic acid in the night. This path of metabolism is called
a) Beta carboxylation
b) Hatch and Slack cycle
c) Crassulacean acid metabolism
d) Calvin cycle

26) The

a) Xylulose
b) Ribose
c) Ribulose
d) All the above

27) Which one is a plant?
a) Pea/Wheat/Rice
b) Potato/Sweet potato
c) Papaya/Sugar beet
d) Sugarcane/Sorghum/Corn

28) Maize
is a

c) CAM plant
d) None of these

29) Tropical plants like maize, sorghum and sugar cane show high efficiency of carbon dioxide fixation due to
a) TCA-Cycle
b) EMP-Pathway
c) HSK-Cycle
d) Calvin cycle

30) Who proposed the cycle of events leading to the fixation of in mesophyll and its reduction in the bundle sheath?
a) Emmerson
b) Melvin Calvin
c) Hatch and Slack
d) Hillo and Bendall

31) plants differ from plants in
b) Photosynthetic product
c) ATP-requirement
d) Type of pigments involved

32) Bundle sheath chloroplast of plants are
a) Large and agranal
b) Large and granal
c) Small and agranal
d) Small and granal

33) How many types of photosynthetic cells occur in plants?
a) One type
b) Two types
c) Four types
d) Eight types

34) Which of the following anatomical features characterize a plant?
a) Chloroplast packed bundle sheath cells
b) Small sized stomatal pores
c) More compact mesophyll with reduced intercellular spaces
d) All the above

35) Which of the cells of

plants are prominently loaded with starch?
a) Epidermal cells
b) Mesophyll cells
c) Bundle sheath cells
d) All of these

36) RuDP-Carboxylase in

plants occurs in
a) Mesophyll
b) Bundle sheath
c) Both A and B
d) Vascular bundles

37) More efficient photosynthesis and the presence of bundle-sheath
chloroplasts are characteristics of

d) CAM-plants

38) In cyanobacteria and photosynthetic bacteria the photosynthesis
takes place in

a) Chloroplast
b) Chromoplast
c) Chromophore
d) Mesosome

39) Which wavelength supports photosynthesis in bacteria?
a) Blue
b) UV
c) Infrared
d) Red

40) What is the byproduct of bacterial photosynthesis?
c) S

41) In purple sulphur bacteria the electron donor is
a) Methane
b) Isopropanol
c) Hydrogen sulphide
d) Hydrogen peroxide

42) Which of the following carries out non-oxygenic photosynthesis?
a) Cyanobacteria
b) Crab grass
c) Bacteria
d) Wheat plant

43) Who proposed the law of limiting factor as the law of

a) Blackman
b) Hill
c) Leibig
d) Priestley

44) The gas released in photosynthesis is

45) In photosynthesis, oxygen is liberated due to
a) Reduction of carbon dioxide
b) Hydrolysis of carbohydrate
c) Photolysis of chlorophyll
d) Breakdown of water

46) For the process of photosynthesis all except one of
the following items are essential. Point out the exception

a) Light and chlorophyll
b) Water and minerals
c) Oxygen and Sucrose

47) What part of the photosynthetic process does not require
light and is temperature dependent?


48) Quantasomes are present in
a) Pigment system – I
b) Pigment system – II
c) Both A and B
d) None of these

49) Photophosphorylation differs from oxidative phosphorylation

a) It takes place in light
b) ATP is formed
c) Cytochrome participates
d) All the above

50) Which of the following may show photosynthesis in moonlight?
a) Some thermal algae
b) Some marine algae
c) Some fresh water algae
d) None of these

51) Phosphatase enzymes in cycle participate in
a) Addition of phosphate
b) Removal of phosphate
c) Both A and B
d) The enzyme is not concerned with removal or addition of phosphate

52) In plants
mesophyll cells are connected with bundle sheath cells
with the help of

a) Cytoplasmic connections
b) Special connecting tissues
c) Plasmodesmata
d) Connection is not essential

53) In dark reaction, the first reaction is the
a) Carboxylation
b) Decarboxylation
c) Dehydrogenation
d) Deamidation

54) Solarization of chlorophyll is
a) Photo-oxidation
b) Photoreduction
c) Oxido-reduction
d) None of these

55) Which of the plants can show CAM cycle?
a) Members of Gramiane
b) Members of Cactaceae
c) Members of Chenopodiaceae
d) All of these

56) Which of the chlorophyll type ejects the electrons during photophosphorylation?
a) Chlorophyll b
b) Chlorophyll a
c) Chlorophyll a and b
d) Xanthophyll

57) Chlorophyll a is found in
a) All oxygen releasing photosynthetic forms
b) All plants except fung
c) All higher plants that photosynthesize
d) All photosynthetic prokaryotes and eukaryotes

58) The bulk fixation of carbon through photosynthesis takes place in
a) Crop-plants
b) Tropical rain forests and crop plants
c) Tropical rain forests
d) Oceans

59) Which one of the following pigments acts as a reaction centre during

b) Cytochrome
c) Carotene
d) Phytochrome

60) During the dark reaction for fixation of carbon, the three carbon atoms
of each molecule of 3-phosphoglyceric acid (PGA) are derived from

a) RuBP only

61) The major role of Phosphorus in plant metabolism is
a) To generate metabolic energy
b) To evolve oxygen during photosynthesis
c) To evolve carbon dioxide during respiration
d) To create anaerobic conditions

62) Photosynthates are transported to other parts of highter plants through
a) Cambial cells
b) Pith cells
c) Xylem cells
d) Phloem cells

63) RuBP carboxylase is an important enzyme of the
a) Krebs cycle
b) Calvin cycle
c) Protein synthesis
d) Gene regulation

64) Organic solutes in plants are translocated through phloem
a) In acropetal direction
b) Laterally
c) In downward direction
d) In both upward and downward directions

65) Pigment which absorbs red-far red light is
a) Phytochrome
b) Cytochrome
c) Ferredoxin
d) None of these

66) Maximum absorption of light by chlorophyll a occurs at
a) 480 nm
b) 580 nm
c) 680 nm
d) more than 680 nm

67) Photosynthetically active radiation is represented by the range of wavelength

a) 640 – 650 nm
b) 600 – 950 nm
c) 400 – 700 nm
d) 340 – 45 nm

68) Oxidative phosphorylation involves simultaneous oxidation and phosphorylation of
b) DPN
c) Pyruvate
d) ATP

69) The receptor of
plants is

a) Xylulose-5 phosphate
b) 3-phosphoglyceric acid
c) Ribulose 1,5 diphosphate
d) Phosphoenol pyruvic acid

70) Which one of the following is represented by the Calvin cycle?
a) Photophosphorylation
b) Oxidative carboxylation
c) Reductive carboxylation
d) Oxidative phosphorylation

71) How many turns of the Calvin cycle produces one molecule of Hexose?
a) Two
b) Six
c) Four
d) Eight

72) Who demonstrated that
is given out in photosynthesis?

a) Kamen
b) Arnon
c) Blackman
d) Park and Biggins

73) Starch is a polymer of
a) Pentose sugar
b) Hexose sugar
c) Both A and B
d) None of the above

74) The step of photosynthesis that requires direct light is
a) Excitation of chlorophyll
d) Regeneration of chlorophyll

75) Which of the following is not correct for

a) These are less efficient for photosynthesis
b) These are less efficient for photorespiration
c) These have Kranz type of anatomy in their leaves

76) The Calvin cycle occurs in the
a) Chloroplast
b) Cytoplasm
c) Mitochondria
d) Glyoxysomes

77) In photosynthesis energy is transferred from the light reaction
to the dark reaction by


plants differ from
plants in respect to

a) Number of ATP used
c) The final product
d) None of these

79) Where does the light reaction of photosynthesis takes

a) Quantasomes or Thylakoids
b) Stroma
c) Outer membrane of chloroplast
d) Inner membrane of chloroplast

80) The Calvin cycle is
a) Dependent on light
b) Not dependent on light
c) Occurs in light
d) Occurs in dark and light both

81) Adenosine diphosphate contains
a) Three high energy bonds
b) One high energy bond
c) Two high energy bonds
d) No high energy bonds

82) Photolysis of water by the isolated chloroplast in presence
of a suitable electron acceptor was demonstrated by

a) Hill
b) Van Niel
c) Calvin
d) Emerson and Arnold

83) Photophosphorylation was discovered by
a) Arnon
b) Hill
c) Ruben and Kamen
d) Calvin

84) The factor which is not limiting under normal conditions
for photosynthesis is

a) Light
b) Chlorophyll content of leaf
c) Water

85) In CAM plants,
acceptor is

a) RuBP
b) PEP
c) OAA
d) PGA

86) Kranz anatomy is found in
a) Monocots
b) Dicots
c) Both A and B
d) None of the above

87) Most plants contain
a) Equal amounts of Chl-a and Chl-b
b) Two or three times more Chl-a than Chl-b
c) Two or thre times more Chl-b than Chl-a
d) None of the above

88) The enzymes that catalyse the dark reaction of carbon
fixation are located

a) Outside the thylakoids
b) Inside the thylakoids
c) Both a and b
d) Neither a nor b

89) The old nodulated roots of legumes turn green because

a) Changes into Chl-a
b) Changes into Chl-b
c) Changes into Chl-a and Chl-b
d) Breaks down

90) In photosynthesis, as a result of photolysis of

a) NADP is reduced
b) NADP is oxidised
c) FAD is oxidised
d) FAD is reduced

91) Agranal chloroplasts occur in certain
a) Succulents
d) Hydrophytes

92) The wavelength of light most absorbed during photosynthesis

a) 400 nm
b) 550 nm
c) 660 nm
d) 700 nm

93) Which one of the following elements is required for photosynthetic oxygen evolution?
a) Copper
b) Iron
c) Manganese
d) Zinc

94) In a plant physiology experiment a green plant kept in light was found releasing more unit of
Which of the following compounds would ha


95) In noncyclic photophosphorylation, the site of ATP synthesis taking place between the following
electron carriers is:

a) PS II and Q
d) PS I and Ferredoxin

96) Munch mass flow hypothesis mainly explains the long distance transport of the following:
a) Mineral salts
b) Sugars
c) Proteins
d) Starch

97) Which pigment is present universally in all green plants?
a) Chlorophyll-a
b) Chlorophyll-b
c) Chlorophyll-c
d) Chlorophyll-m

98) Solarization is a process in which
a) Sugars are formed with the help of solar energy
b) Chlorophyll is activated
c) Chlorophyll is destroyed
d) Light energy is mobilised

99) Breathing is controlled by the —-
a) lungs
b) trachea
c) medulla oblongata
d) hypothalamus

100) Which of the following does not contain neurons?
a) grey matter
b) white matter
c) both above
d) none above



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