Plant Physiology Quiz | Plant Physiology Objective Type Questions and Answers

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Questions
21 Gibberellic acid induces flower
A in short day plants under long day conditions
B in day-neutral plants under dark conditions
C in some gymnospermic plants only
D in long day plants under short day conditions

Answer: high atmospheric humidity
22 Bidirectional translocation of solutes takes place in
A parenchyma
B cambium
C xylem
D phloem

Answer: phloem
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23 The correct sequence of electron acceptor in ATP synthesis is
A Cyt. b, c, a3, a
B Cyt. c, b, a, a3
C Cyt. o, a, b, c
D Cyt. b, c, a, a3

Answer: Cyt. b, c, a, a3
24 ‘The law of limiting factors’ was proposed by
A Leibig
B Hatch and Slack
C Blackman
D Arnon

Answer: Blackman
25 Photorespiration is favoured by
A high temperature and low O2
B high humidity and temperature
C high O2 and low CO2
D high CO2 and low O2

Answer: high O2 and low CO2
26 When water enters in roots due to diffusion, is termed as
A osmosis
B passive absorption
C endocytosis
D active absorption

Answer: passive absorption
27 In C4 plants, CO2 combines with
A phosphoenol pyruvate
B phosphoglyceraldehyde
C phosphoglyceric acid
D ribulose diphosphate

Answer: phosphoenol pyruvate
28 In C4 plants, CO2 fixation is done by
A sclerenchyma
B chlorenchyma and hypodermis
C mesophyll cells
D guard cells

Answer: mesophyll cells
29 Which of the following element plays an important role in biological nitrogen fixation?
A copper
B molybdenum
C zinc
D manganes

Answer: molybdenum
30 The primary acceptor, during C02 fixation in C3 paints, is
A phosphoenolpyruvate (PEP)
B ribulose 1, 5-diphosphate (RuDP)
C phosphoglyceric acid (PGA)
D ribulose monophosphate (RMP)

Answer: ribulose 1, 5-diphosphate (RuDP)
31 The C02 fixation during C4 pathway occurs in the chloroplast of
A guard cells
B bundle sheath cells
C mesophyll cells
D spongy parenchyma

Answer: mesophyll cells
32 The closure of lid of pitcher in pitcher plant, is due to
A paratonic movement
B autonomous movement
C turgor movement
D tropic movement

Answer: paratonic movement
33 The movement of water, from one cell of cortex to adjacent one in roots, is due to
A accumulation of inorganic salts in the cells
B accumulation of organic compounds in the cells
C water potential gradient
D chemical potential gradient

Answer: water potential gradient
34 The movement of auxin is largely
A centripetal
B basipetal
C acropetal
D both ‘a’ and ‘c’

Answer: basipetal
35 If the growing plant is decapitated, then
A its growth stops
B leaves become yellow and fall down
C axillary buds are inactivated
D axillary buds are activated

Answer: axillary buds are activated
36 During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation?
A release of O2
B formation of ATP
C formation of NADPH
D involvement of PS I and PS II pigment systems

Answer: formation of ATP
37 A photosynthesising plant is releasing lsO more than the normal. The plant must have been supplied with
A O3
B H20 with 180O
C CO2 with 15O
D C6H12O6 with 18O

Answer: H20 with 180O
38 The carbon dioxide acceptor in Calvin cycle/ C3-plants is
A phospho-enol pyruvate (PEP)
B ribulose 1, 5-diphosphate (RuBP)
C phosphoglyceric acid (PGA)
D ribulose monophosphate (RMP)

Answer: ribulose 1, 5-diphosphate (RuBP)
39 Which one is a C4-plant?
A papaya
B pea
C potato
D maize/corn

Answer: maize/corn
40 Removal of apical bud results in
A formation of new apical bud
B elongation of main stem
C death of plant
D formation of lateral branching

Answer: formation of lateral branching

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