Plant Physiology MCQs | Plant Physiology Multiple Choice Questions with Answers

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Questions
61 A chemical believed to be involved in flowering is
A gibberellin
B kinetin
C florigen
D IBA

Answer: florigen
62 The hormone responsible for apical dominance is
A IAA
B GA
C ABA
D Florigen

Answer: IAA
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63 Twining of tendrils is due to
A thigmotropism
B seismonasty
C heliotropism
D diageotropism

Answer: thigmotropism
64 Abscisic acid causes
A stomatal closure
B leaf expansion
C stem elongation
D root elongation

Answer: stomatal closure
65 Photosynthetic pigments found in the chloroplasts occur in
A thylakoid membranes
B plastoglobules
C matrix
D chloroplast envelope

Answer: thylakoid membranes
66 During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
A C02
B light
C temperature
D water

Answer: light
67 Dark reactions of photosynthesis occur in
A granal thylakoid membranes
B stromal lamella membranes
C stroma outside photosynthetic lamellae
D periplastidial space

Answer: stroma outside photosynthetic lamellae
68 With an increase in the turgidity of a cell, the wall pressure will be
A fluctuate
B remain unchanged
C increase
D decrease

Answer: increase
69 When a cell is fully turgid, which of the following will be zero?
A turgor pressure
B water potential
C wall pressure
D osmotic pressure

Answer: water potential
70 NADPH2 is generated through
A photosystem II
B anaerobic respiration
C glycolysis
D photosystem I

Answer: photosystem I
71 A pigment which absorbs red and far-red light is
A Cytochrome
B xanthophyll
C phytochrome
D carotene

Answer: phytochrome
72 The core metal of chlorophyll is
A Ni
B Cu
C Fe
D Mg

Answer: Mg.
73 Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring II has one of the following
A carboxylic group
B magnesium
C aldehyde group
D methyl group

Answer: methyl group
74 Which one among the following chemicals is used for causing defoliation of forest trees?
A malic hydrazide
B 2, 4-D
C amo-1618
D phosphon D

Answer: 2, 4-D
75 Phytochrome becomes active in
A red light
B green light –
C blue light
D none of these

Answer: none of these.
76 The water potential and osmotic potential of pure
A 100 and 200
B zero and 100
C 100 and zero
D zero and zero

Answer: zero and zero
77 Which combination of gases is suitable for fruit ripening?
A 80 % CH4 and 20% CO2
B 80% CO2 and 20% O2
C 80% C2H4 and 20% CO2
D 80% CO2 and 20% CH2

Answer: 80% C2H4 and 20% CO2
78 A plant hormone used for inducing morphogenesis in plant tissue culture is
A Cytokinins
B Ethylene
C Abscisic Acid
D Gibberellins

Answer: Cytokinins
79 The closing and opening of the leaves of Mimosa pitdica is due to
A seismonastic movement
B chemonastic movement
C thermonastic movement
D hydrotropic movement

Answer: seismonastic movement
80 The rate of photosynthesis is higher in
A very high light
B continuous light
C red light
D green light

Answer: red light

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