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Free download in PDF Plant Physiology Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(24)
‘The law of limiting factors’ was proposed by
[A]
Leibig
[B]
Hatch and Slack
[C]
Blackman
[D]
Arnon
(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
(29)
Which of the following element plays an important role in biological nitrogen fixation?
[A]
copper
[B]
molybdenum
[C]
zinc
[D]
manganes
(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
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’
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
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
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
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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