Chapter-wise MCQ Questions

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Question-1. When a photosynthetic plant is transferred to an atmosphere of enriched O2, its rate of

  1. respiration would decrease
  2. osmosis would increase
  3. None of these
  4. photosynthesis would decrease.
Answer-1

Question-2. When leaf cells are fully turgid, the transpiration rate is:

  1. medium
  2. low
  3. not affected
  4. high
Answer-2

Question-3. When the fluid outside a cell has a greater concentration of a given molecule than the fluid inside the cell, the external fluid is

  1. hypertonic
  2. hypotonic
  3. ultratonic
  4. isotonic
Answer-3

Question-4. Which element is located at the centre of the porphyrin ring in chlorophyll?

  1. Calcium
  2. Magnesium
  3. Potassium
  4. Manganese
Answer-4

Question-5. Which element is required in the germination of pollen grain?

  1. Chlorine
  2. Potassium
  3. Calcium
  4. Boron
Answer-5

Question-6. Which enzyme is most abundantly found on earth?

  1. Nitrogenase
  2. Invertase
  3. Catalase
  4. RuBisCo
Answer-6

Question-7. Which enzyme is most abundantly found on earth?

  1. Rubisco
  2. Nitrogenase
  3. Invertase
  4. Catalase
Answer-7

Question-8. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?

  1. Blue and green
  2. Green and red
  3. Red and violet
  4. Violet and blue
Answer-8

Question-9. Which of the following absorb light energy for photosynthesis?

  1. Water molecule
  2. O2
  3. RuBP
  4. Chlorophyll
Answer-9

Question-10. Which of the following are products of light reaction?

  1. NADPH2 and ATP
  2. ADP and ATP
  3. NADPH2 and Glucose
  4. NADPH2 and Water
Answer-10

Question-11. Which of the following are the principal photoreceptors in the chloroplast of green plants?

  1. Chlorophyll a and b
  2. Chlorophyll and d
  3. Chlorophyll d and c
  4. Chlorophyll b and c
Answer-11

Question-12. Which of the following colours of light work best for photosynthesis?

  1. Yellow
  2. Blue
  3. Both a and c
  4. Red
Answer-12

Question-13. Which of the following conditions in a plant cell would increase the uptake of water?

  1. osmotic pressure is equal to turgor pressure
  2. osmotic pressure is less than the turgor pressure
  3. both a and c
  4. osmotic pressure is higher than the turgor pressure
Answer-13

Question-14. Which of the following conducts water inside plant body?

  1. xylem
  2. cortex
  3. pith
  4. phloem
Answer-14

Question-15. Which of the following forces are responsible for the ascent of water in plant body?

  1. root pressure
  2. transpiration pull
  3. both b and c
  4. atmospheric pressure
Answer-15

Question-16. Which of the following is not necessary for photosynthesis?

  1. Chlorophyll
  2. H2O
  3. Oxygen
  4. CO2
Answer-16

Question-17. Which of the following is not true of the exudation of water?

  1. water drops come out through hydathodes
  2. water is forced out of the leaves by root pressu
  3. water drops are not formed by dew
  4. water drops come out through stomata
Answer-17

Question-18. Which of the following is obtained from posphoglyceraldehyde in the dark reaction of photosynthesis?

  1. glucose
  2. carbon dioxide
  3. plastoquinone
  4. phosphoglyceric acid
Answer-18

Question-19. Which of the following is the source of hydrogen in the glucose molecule formed during photosynthesis?

  1. CO2
  2. ATP
  3. NADP
  4. Water
Answer-19

Question-20. Which of the following is the worlds most common protein?

  1. ribulose biphosphate carboxylase
  2. insulin
  3. diastase
  4. cellulose
Answer-20

Question-21. Which of the following is true of chlorophyll?

  1. containing iron atom in the center
  2. containing magnesium atom in the center
  3. present in all cells of green plants
  4. absorbs all types of waves of sunlight
Answer-21

Question-22. Which of the following percentage of transpiration usually occurs through the stomata?

  1. 50%
  2. 60%
  3. 90%
  4. 30%
Answer-22

Question-23. Which of the following processes is responsible for the entry of water into root hair?

  1. osmotic pressure
  2. turgor pressure
  3. atmospheric pressure
  4. wall pressure
Answer-23

Question-24. Which of the following products of light reaction of photosynthesis is not used in the dark reaction?

  1. NADPH2
  2. Oxygen
  3. None of these
  4. ATP
Answer-24

Question-25. Which of the following statement is incorrect ?

  1. Tropical plants have higher temperature optimum than the plants adapted to temperate climate.
  2. The effect of water as a factor is more through its effect on plant, rather than directly on photosynthesis
  3. Light reaction is less temperature sensitive than dark reaction.
  4. C3 plants respond to higher temperature, show higher photosynthetic rate while C4 plants have lower optimum temperature
Answer-25

Question-26. Which of the following statements regarding photorespiration are true?

  1. Photorespiration results in a loss of usable carbon dioxide
  2. Photorespiration is a metabolically expensive pathway
  3. Photorespiration is avoided when CO2 is abundant
  4. All of the above
Answer-26

Question-27. Which of the following would occur when a plant cell is packed in a fluid with high osmotic concentration than the cell sap?

  1. Plasmolysis
  2. Deplasmolysis
  3. Diffusion
  4. imbibition
Answer-27

Question-28. Which one is a C4 plant?

  1. Pea
  2. Potato
  3. Maize/corn
  4. Papaya
Answer-28

Question-29. Which one occurs both during cyclic and non-cyclic modes of photophosphorylation?

  1. Formation of ATP
  2. Release of O2
  3. Formation of NADPH
  4. Involvement of both PS-I and PS-II
Answer-29

Question-30. Which one of the following is represented by Calvin cycle?

  1. Oxidative carboxylation
  2. Photophosphorylation
  3. Oxidative phosphorylation
  4. Reductive carboxylation
Answer-30

Question-31. Which one of the following is wrong in relation to photorespiration?

  1. It occurs’in chloroplasts
  2. It occurs in day time only
  3. It is a characteristic of C4-plants
  4. It is a characteristic of C3 -plants
Answer-31

Question-32. Which one of the following pigment does not occur in the chloroplast?

  1. Xanthophyll
  2. Carotene
  3. Chlorophyll 'b'
  4. Anthocyanin
Answer-32

Question-33. Which one of the following statements about cytochrome P450 is wrong?

  1. It is an enzyme involved in oxidation reactions
  2. It is a coloured cell
  3. It has an important role in metabolism
  4. It contains iron
Answer-33

Question-34. Which pair is wrong?

  1. C4—Kranz anatomy
  2. Calvin cycle—PGA
  3. Hatch and Slack Pathway—Oxalo acetic acid
  4. C3—Maize
Answer-34

Question-35. Which pigment is water soluble?

  1. Chlorophyll
  2. Carotene
  3. Xanthophyll
  4. Anthocyanin
Answer-35

Question-36. Which pigment system is inactivated in red drop?

  1. PS-I
  2. PS-II
  3. None of these
  4. PS-Iand PS-II
Answer-36

Question-37. Which technique has helped in investigation of Calvin cycle?

  1. X-ray technique
  2. Radioactive isotope technique
  3. Intermittent light
  4. X-ray crystallography
Answer-37

Question-38. With the increase of ions in the xylem its water potential becomes

  1. more negative
  2. zero
  3. neutral
  4. more positive
Answer-38

Question-39. Besides water and CO2, which is more essential a raw material for food formation

  1. oxygen
  2. NAD
  3. mineral salt
  4. light
Answer-39

Question-40. Discovery of Emerson effect has already shown the

  1. light and dark reactions of photosynthesis
  2. photophosphorylation
  3. photorespiration
  4. two distinct photochemical reactions
Answer-40

Question-41. In actively gro – wing young plants, the best data for estimating the rate of photosynthesis would be

  1. increase in fresh weight
  2. increase in dry weight
  3. increase in carbohydrate
  4. ratio of oxygen evolved to carbon dioxide absorbed
Answer-41

Question-42. Kranz anatomy is a feature of

  1. CAM plants
  2. C4 plants
  3. All of these
  4. C3 plants
Answer-42

Question-43. Light reactions of photosynthesis occurs in

  1. thylakoid
  2. grana
  3. cytoplasm of cell
  4. stroma
Answer-43

Question-44. Manganese is required in

  1. Nucleic acid synthesis
  2. Plant cell wall formation
  3. Photolysis of water during photosynthesis
  4. Chlorophyll synthesis
Answer-44

Question-45. Oxidative phosphorylation refers to

  1. The citric acid cycle production of ATP
  2. Production of ATP by chemiosmosis
  3. Alcoholic fermentation
  4. Anaerobic production of ATP
Answer-45

Question-46. The law of limiting factor was given by

  1. Blackman
  2. Priestley
  3. None of these
  4. Calvin
Answer-46

Question-47. The metabolic pathway which produces carbohydrate is

  1. Glycolysis
  2. Cyclic electron pathway
  3. Krebs cycle
  4. Calvin cycle
Answer-47

Question-48. The primary carbon dioxide acceptor in C4 cycle is

  1. phosphoenol pyruvate
  2. rubisco
  3. aspartic acid
  4. malic acid
Answer-48

Question-49. Translocation of sugar in flowering plants occurs in the form of

  1. sucrose
  2. starch
  3. maltose
  4. glucose
Answer-49

Question-50. Water stress causes

  1. increase in metabolic rate
  2. wilting of leaves
  3. lesser availability of carbon dioxide
  4. opening of stomata
Answer-50

Question-51. Where are thylakoids and grana located?

  1. Mitochondria
  2. Chloroplasts
  3. Golgi apparatus
  4. Lysosomes
Answer-51

Question-52. Which of the following is a 4-carbon compound?

  1. Phosphoglyceric acid
  2. Ribulose biphosphate
  3. Phosphoenolpyruvate
  4. Oxaloacetic acid
Answer-52

Question-53. Which of the following is not an accessory pigment?

  1. Chlorophyll a
  2. Chlorophyll b
  3. Xanthophyll
  4. Carotene
Answer-53

Question-54. Which of the following process (C4 cycle) occurs in bundle sheath cells?

  1. Fixation
  2. Carboxylation
  3. Decarboxylation
  4. Regeneration
Answer-54

Question-55. Which one of the following statement is true for ATP?

  1. ATP is an enzyme
  2. ATP is organic ions of enzyme
  3. ATP is a Co-enzyme
  4. ATP is prosthetic part of an enzyme
Answer-55

Question-56. Who enunciated the law of limiting factor for photosynthesis?

  1. Ruben
  2. Blackman
  3. Calvin
  4. Robert Emerson
Answer-56

Question-57. The rate of photosynthesis is controlled by

  1. the rate of dark reaction
  2. the rates of both light and dark reactions
  3. none of the above
  4. the rate of light reaction
Answer-57

Question-58. The end product of the Calvin cycle is

  1. PGAL
  2. PGA
  3. ADP + NADP
  4. RuBP
Answer-58

Question-59. In which of the following assimilates move along the concentration gradient?

  1. xylem vessels
  2. trachieds
  3. fibers
  4. sieve tubes
Answer-59

Question-60. A photosynthesizing plant is releasing 18O more than the normal. The plant must have been supplied with

  1. H2O with 18O
  2. CO2 with 18O
  3. C6H12O6 with 18O
  4. O3
Answer-60

Question-61. A photosystem is an assemblage of pigment molecules together ranging from

  1. 100 – 200
  2. 200 – 400
  3. 400 – 500
  4. 10 – 100
Answer-61

Question-62. A very efficient converter of solar energy with net productivity of 2-4 kg/m2 or more is the crop of

  1. sugarcane
  2. rice
  3. bajra
  4. wheat
Answer-62

Question-63. As a first identifiable product of the dark reaction is:

  1. PGAL
  2. Glucose
  3. RuBP
  4. PGA
Answer-63

Question-64. As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants

  1. 6
  2. 12
  3. zero
  4. 2
Answer-64

Question-65. C4-cycle was discovered by

  1. Calvin
  2. Hill
  3. Arnon
  4. Hatch and Slack
Answer-65

Question-66. Chemiosmotic hypothesis given by Peter Mitchell proposes the mechanism of

  1. synthesis of NADH
  2. synthesis of NADPH
  3. None of these
  4. synthesis of ATP
Answer-66

Question-67. Chlorophyll "a" occurs in all Photosynthetic plants except:

  1. Blue green algae
  2. Angiosperms
  3. Pigment containing bacteria
  4. Green algae
Answer-67

Question-68. Chlorophyll in chloroplasts is located in

  1. inner membrane
  2. thylakoids
  3. stroma
  4. outer membrane
Answer-68

Question-69. Chlorophyll is a large molecule with a central core of:

  1. Sulphur
  2. Nitrogen
  3. Magnesium
  4. Iron
Answer-69

Question-70. Chlorophyll mainly absorbs red light and:

  1. Yellow light
  2. Blue light
  3. Orange light
  4. Green light
Answer-70

Question-71. Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring-II has one of the following

  1. methyl group
  2. carboxyl group
  3. magnesium
  4. aldehyde group
Answer-71

Question-72. Chlorophyll-a occurs in

  1. in all higher plants
  2. all oxygen liberating autotrophs
  3. all plants except fungi
  4. all photosynthetic autotrophs
Answer-72

Question-73. Chlorophylls c, d and e are present in:

  1. Gymnosperms
  2. Bacteria
  3. Algae
  4. Angiosperms
Answer-73

Question-74. Cytochrome is

  1. Fe-containing porphyrin pigment
  2. glycoprotein
  3. lipid
  4. metallo flavo protein
Answer-74

Question-75. Dark reactions of photosynthesis occur in

  1. stromal lamella membranes
  2. stroma outside photosynthetic lamellae
  3. periplastidial space
  4. granal thylakoid membranes
Answer-75

Question-76. During light reaction of photosynthesis, ATP formation occurs when electrons are transported between cytochrome:

  1. b and c
  2. b and f
  3. c and f
  4. a and b
Answer-76

Question-77. During monsoon, the rice crop of Eastern states of India shows lesser yield due to limiting factor of

  1. light
  2. temperature
  3. water
  4. CO2
Answer-77

Question-78. Ferredoxin is a constituent of

  1. PS-II
  2. Hill reaction
  3. P680
  4. PS-I
Answer-78

Question-79. Fixation of one CO2 molecule through Calvin cycle requires

  1. 2 ATP and 2NADPH2
  2. 3 ATP and 2NADPH2
  3. 2ATP and 1NADPH2
  4. 1 ATP and 2NADPH2
Answer-79

Question-80. Formation of ATP in photosynthesis and respiration is an oxidation process which utilises the energy from

  1. ferredoxin
  2. electrons
  3. carbon dioxide
  4. cytochromes
Answer-80

Question-81. Germination of seed involves the rupturing of seed coat because of:

  1. Imbibitions
  2. Diffusion
  3. Active transport
  4. Osmosis
Answer-81

Question-82. Grana are present inside the

  1. ribosome
  2. mitochondria
  3. endoplasmic reticulum
  4. chloroplast
Answer-82

Question-83. Greatest producers of organic matter are

  1. forests
  2. plants of the land area
  3. phytoplankton of oceans
  4. crop plants
Answer-83

Question-84. High energy electrons in photo system I are transferred from FRS to:

  1. PC
  2. NADP
  3. PQ
  4. ATP
Answer-84

Question-85. How many turns of Calvin cycle yield one molecule of glucose?

  1. 2
  2. 6
  3. 4
  4. 8
Answer-85

Question-86. In a CAM plant, the concentration of organic acid

  1. decreases or increases during day
  2. decreases during the day
  3. increases during the day.
  4. increases during night
Answer-86

Question-87. In C3-plants, the first stable product of photosynthesis during the dark reaction is

  1. oxaloacetic acid
  2. 3-phosphoglyceric acid
  3. phosphoglyceraldehyde
  4. malic acid
Answer-87

Question-88. In C4 plants, agranal chloroplasts are found in

  1. chloroplasts of guard cells
  2. epidermal cell chloroplasts of green stem
  3. mesophyll cells
  4. bundle sheath cells
Answer-88

Question-89. In C4-plants, Calvin cycle operates in

  1. grana of bundle sheath chloroplasts
  2. grana of mesophyll chloroplasts
  3. stroma of mesophyll chloroplasts
  4. stroma of bundle sheath chloroplasts
Answer-89

Question-90. In photosynthesis energy from light reaction to dark reaction is transferred in the form of

  1. ATP
  2. RuDP
  3. chlorophyll
  4. ADP
Answer-90

Question-91. In photosystem II, the electrons lost by reaction center are replaced by electrons from

  1. C2 O
  2. Photosystem I
  3. ATP
  4. H2O
Answer-91

Question-92. In photosystem-I the first electron acceptor is

  1. cytochrome
  2. plastocyanin
  3. ferredoxin
  4. an iron-sulphur protein
Answer-92

Question-93. In sugarcane plant 14CO2 is fixed in malic acid, in which the enzyme that fixes CO2 is

  1. ribulose bisphosphate carboxylase
  2. phosphoenol pyruvic acid carboxylase
  3. ribulose phosphate kinase
  4. fructose phosphatase
Answer-93

Question-94. In the dark reaction, ATP and NADPH2 react with:

  1. PGA
  2. PGAL
  3. Glucose
  4. RuBP
Answer-94

Question-95. In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of

  1. phloem
  2. epidermis
  3. bundle sheath
  4. mesophyll
Answer-95

Question-96. In the photo system II, high energy electrons of chlorophyll molecule are accepted by:

  1. PQ
  2. NAD
  3. ATP
  4. PC
Answer-96

Question-97. Kranz anatomy is typical of

  1. C3-plants
  2. C2-plants
  3. CAM plants
  4. C4-plants
Answer-97

Question-98. Light reaction of photosynthesis occurs in:

  1. Stroma
  2. Mitochondria
  3. Leucoplast
  4. Granum
Answer-98

Question-99. Maximum solar energy is trapped by

  1. cultivating crops
  2. growing algae in tanks
  3. growing grasses
  4. planting trees
Answer-99

Question-100. NADPH is generated through

  1. photosystem-II
  2. anaerobic respiration
  3. glycolysis
  4. photosystem-I
Answer-100

Question-101. Nine-tenth of all photosynthesis of world (85-90%) is carried out by

  1. algae of the ocean
  2. chlorophyll containing ferns of the forest
  3. scientists in the laboratories
  4. large trees with millions of branches and leaves
Answer-101

Question-102. Of the total sunlight reaching the earth, the percentage used in the photosynthesis is:

  1. 20%
  2. 30%
  3. 50%
  4. 2%
Answer-102

Question-103. Oxygen gas released during photosynthesis is comes from:

  1. CO2
  2. Glucose
  3. None of these
  4. Water
Answer-103

Question-104. Photochemical reactions in the chloroplast are directly involved in

  1. fixation of carbon dioxide
  2. synthesis of glucose and starch
  3. photolysis of water and phosphorylation of ADP to ATP
  4. formation of phosphoglyceric acid
Answer-104

Question-105. Photophosphorrylation in a chloroplast is mot similar to which of the following mitochondrial reaction?

  1. oxidative phosphorylation
  2. oxidative decarboxylation
  3. hydrolysis
  4. substrate-level phosphorylation
Answer-105

Question-106. Photorespiration is favoured by

  1. low light and high O2
  2. low temperature and high O2
  3. None of these
  4. high O2 and low CO2
Answer-106

Question-107. Photosynthetic pigments found in the chloroplasts occur in

  1. plastoglobules
  2. matrix
  3. chloroplast envelope
  4. thylakoid membranes
Answer-107

Question-108. Photosynthetically active radiation is represented by the range of wavelength

  1. 400-700 nm
  2. 500-600 nm
  3. 400-950 nm
  4. 340-450 nm
Answer-108

Question-109. Photosystem I has an absorption spectrum of wavelengths of around

  1. 650 nm
  2. 680 nm
  3. 700 nm
  4. 600 nm
Answer-109

Question-110. Photosystem-II occurs in

  1. cytochrome
  2. grana
  3. mitochondrial surface
  4. stroma
Answer-110

Question-111. Pigment acting as a reaction centre during photosynthesis is

  1. phytochrome
  2. P700
  3. cytochrome
  4. carotene
Answer-111

Question-112. Plants do not store carbohydrates as glucose because it

  1. attracts insects herbivores
  2. is an unstable molecule
  3. would replace ribose in DNA synthesis
  4. dissolves in water, thereby altering the osmotic bala
Answer-112

Question-113. Protochlorophyll differs from chlorophyll in lacking

  1. 2 hydrogen atoms in two of its pyrrole rings
  2. 4 hydrogen atoms in one of its pyrrole rings
  3. 4 hydrogen atoms in two of its pyrrole rings
  4. 2 hydrogen atoms in one of its pyrrole rings
Answer-113

Question-114. Quantasomes are present in

  1. golgi body
  2. lysosome
  3. None of these
  4. chloroplast
Answer-114

Question-115. RuBisCO stands for

  1. Ribulose Phosphate Carboxylase Oxygenase
  2. Ribulose Phosphate Carboxylic Oxygenase
  3. None of the above
  4. Ribulose Biphosphate Carboxylase Oxygenase
Answer-115

Question-116. Stomata of CAM plants

  1. are always open
  2. open during the day and close at night
  3. open during the night and close during the day
  4. never open
Answer-116

Question-117. The break down of water molecule (photolysis) in photosynthesis occurs during:

  1. dark reaction
  2. Glycolysis
  3. Krebs cycle
  4. light reaction
Answer-117

Question-118. The carbon dioxide acceptor in Calvin cycle/ C3 plants is

  1. Ribulose 1,5-diphosphate (RuDP)
  2. Phosphoglyceric Acid (PGA)
  3. Ribulose Monophosphate (RMP)
  4. Phosphoenol pyruvate (PEP)
Answer-118

Question-119. The combined area of total stomatal pores as compared to the total leaf area is almost:

  1. 3-4%
  2. 5-6%
  3. 7-8%
  4. 1-2%
Answer-119

Question-120. The empirical formula of chlorophyll a is:

  1. C55 H70 O5 N3 Mg
  2. C56 H72 O66 N4 Mg
  3. C55 H74 O5 N5 Mg
  4. C55 H72 O5 N4 Mg
Answer-120

Question-121. The enzyme that catalyses initial carbon dioxide fixation in C4 plants is

  1. PEP carboxylase
  2. carbonic anhydrase
  3. carboxydismutase
  4. RuBP carboxylase
Answer-121

Question-122. The exudation of water drops from the leaves of intact plants is:

  1. transpiration
  2. evaporation
  3. transportation
  4. guttation
Answer-122

Question-123. The final acceptor of electrons during the light reaction of photosynthesis is:

  1. Cyt. B
  2. ATP
  3. NADP
  4. Cyt. F
Answer-123

Question-124. The first carbon dioxide acceptor in C 4-plants is

  1. ribulose 1,5-diphosphate
  2. oxalo acetic acid
  3. phosphoglyceric acid
  4. phosphoenol-pyruvate
Answer-124

Question-125. The first step of photosynthesis is

  1. formation of ATP
  2. attachment of CO2 to 5 carbon sugar
  3. ionisation of water
  4. excitation of electron of chlorophyll by a photon of light
Answer-125

Question-126. The most effective light absorbed by the chlorophyll is:

  1. orange
  2. green
  3. none of these
  4. yellow
Answer-126

Question-127. The movement of solvent molecules through a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration is:

  1. Plasmolysis
  2. Osmosis
  3. Active transport
  4. Diffusion
Answer-127

Question-128. The number of stomata per square centimeter of leaf surface of tobacco leaf is almost:

  1. 2100
  2. 12000
  3. 21000
  4. 1200
Answer-128

Question-129. The organelles which take part in photo-respiration are

  1. mitochondria, lysosomes, peroxisome
  2. chloroplast, mitochondria, lysosome
  3. chloroplast, mitochondria, nucleus
  4. mitochondria, chloroplast, peroxisome
Answer-129

Question-130. The osmotic pressure of a solution

  1. decrease with increase in concentration of solute
  2. remains unchanged with increase in concentration of sol
  3. none of these
  4. increases with increase in concentration of solute
Answer-130

Question-131. The osmotic pressure of pure water is:

  1. 10
  2. 100
  3. 1
Answer-131

Question-132. The principle of limiting factors was proposed by

  1. Hill
  2. Arnon
  3. Liebig
  4. Blackmann
Answer-132

Question-133. The process where by water moves through the plants is known as :

  1. Translocation
  2. Guttation
  3. Osmosis
  4. Transpiration
Answer-133

Question-134. The processes involved in stomatal transpiration are:

  1. 4
  2. 8
  3. 6
  4. 2
Answer-134

Question-135. The sequence of electron acceptors in the light reaction is

  1. PQ—PC—Cytb—-Cyt f
  2. PQ—PC—Cyt f—-Cytb
  3. PQ—Cyt b—Cyt f—-PC
  4. PQ—cyf f—cyt b—-PC
Answer-135

Question-136. The shrinkage of protoplasm due to ex-osmosis of water from the cell is called:

  1. Deplasmolysis
  2. Plasmolysis
  3. Imbibition
  4. Osmosis
Answer-136

Question-137. The substrate for photorespiration is

  1. glycolate
  2. serine
  3. glycine
  4. ribulose bis-phosphate
Answer-137

Question-138. The taking up of a liquid by a substance with the resultant swelling in volume is called:

  1. Imbibitions
  2. Diffusion
  3. Active transport
  4. Plasmolysis
Answer-138

Question-139. The transport of substances from a region of its lower concentration to its higher concentration is called:

  1. Imbibition
  2. Active transport
  3. Passive transport
  4. Osmosis
Answer-139

Question-140. The water of guttation is forced out of the leaves by:

  1. Root Pressure
  2. Imbibition
  3. Active transport
  4. Diffusion
Answer-140

Question-141. The water potential of all solutions as compared to pure water is always:

  1. lower
  2. equal
  3. none of these
  4. higher
Answer-141

Question-142. The wave lengths of red light are in the range of:

  1. 500-550 nm
  2. 600-650 nm
  3. 700-750 nm
  4. 400-500 nm
Answer-142

Question-143. The wavelengths of visible light are longer than the wavelengths of

  1. ultraviolet
  2. microwaves
  3. radio waves
  4. infrared
Answer-143

Question-144. Water in the xylem vessel will ascend up until

  1. gravitational pull is higher then the cohesive and adhesive strength of water
  2. sufficient water is available in the soil
  3. it is used in the photosynthesis
  4. its cohesive and adhesive strength is more than the gravitational pull
Answer-144

Question-145. Water potential of a liquid increases when solute concentration

  1. Decreases
  2. Remains unchanged
  3. None of these
  4. Increases
Answer-145



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