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Free download in PDF Plant Physiology Multiple Choice Questions with 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.
61
A chemical believed to be involved in flowering is
[A]
gibberellin
[B]
kinetin
[C]
florigen
[D]
IBA
62
The hormone responsible for apical dominance is
[A]
IAA
[B]
GA
[C]
ABA
[D]
Florigen
63
Twining of tendrils is due to
[A]
thigmotropism
[B]
seismonasty
[C]
heliotropism
[D]
diageotropism
64
Abscisic acid causes
[A]
stomatal closure
[B]
leaf expansion
[C]
stem elongation
[D]
root elongation
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
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
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
70
NADPH2 is generated through
[A]
photosystem II
[B]
anaerobic respiration
[C]
glycolysis
[D]
photosystem I
71
A pigment which absorbs red and far-red light is
[A]
Cytochrome
[B]
xanthophyll
[C]
phytochrome
[D]
carotene
72
The core metal of chlorophyll is
[A]
Ni
[B]
Cu
[C]
Fe
[D]
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
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
75
Phytochrome becomes active in
[A]
red light
[B]
green light –
[C]
blue light
[D]
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
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
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
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