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Question-1
Leaf fall can be prevented with the help of
(A)
abscisic acid
(B)
auxins
(C)
florigen
(D)
cytokinins
Question-2
The pigment , that absorbs red and far-red light in plants, is
(A)
xanthophyll
(B)
cytochrome
(C)
phytochrome
(D)
carotene
Question-3
Movement of auxin is
(A)
centripetal
(B)
basipetal
(C)
acropetal
(D)
both(b) and (c)
Question-4
Which of the following hormones can replace vernalization?
(A)
Auxin
(B)
Cytokinin
(C)
Gibberellins
(D)
Ethylene
Question-5
The hormone responsible for apical dominance is
(A)
IAA
(B)
GA
(C)
ABA
(D)
florigen
Question-6
What will be the effect on phytochrome in a plant subjected to continuous red light?
(A)
Level of phytochrome decreases
(B)
Phytochrome is destroyed
(C)
Phytochrome synthesis increases
(D)
Destruction and synthesis of phytochrome remain in equilibrium
Question-7
Dwarfness can be controlled by treating the plant with
(A)
cytokinin
(B)
gibberellic acid
(C)
auxin
(D)
antigibberellin
Question-8
Phytochrome is involved in
(A)
Phototropism
(B)
Photorespiration
(C)
Photoperiodism
(D)
Geotropism
Question-9
Geocarpic fruits are produced by
(A)
onion
(B)
watermelon
(C)
ground nut
(D)
carrot
Question-10
A plant hormone used for inducing morphogenesis in plant tissue culture is
(A)
gibberellins
(B)
cytokinins
(C)
ethylene
(D)
abscisic acid
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Plus 2 Biology Science
ICSE/ISC
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