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Question-1
Chrysanthemum is an example of:
(A)
Long day plant
(B)
Short day plant
(C)
Day neutral plant
(D)
Vernalised plant
Question-2
For flowering, long day plants need:
(A)
Lengthy day period
(B)
Lengthy dark period
(C)
Short day period
(D)
Neutral
Question-3
Which of the following is used for stem elongation?
(A)
Cytokinins
(B)
Gibberellins
(C)
ABA
(D)
Auxin
Question-4
Name the growth substance used as weedkiller (weedicide).
(A)
Auxin
(B)
ABA
(C)
IBA
(D)
2, 4 , D
Question-5
Commercial use of synthetic auxin in cuttings is to stimulate the growth of:
(A)
Roots
(B)
Leaves
(C)
Flowers
(D)
Buds
Question-6
The first auxin to be discovered was:
(A)
Indole Acetic Acid (IAA)
(B)
Indole Butyric Acid (IBA)
(C)
Naphthalene Acetic Acid (NAA)
(D)
2, 4, D
Question-7
Gardeners pinch out apical bud to keep:
(A)
Plants healthy
(B)
Plants grow taller
(C)
Plants small and bushy
(D)
Plants to produce meristem
Question-8
Two growth substances may act together to produce a larger effect. This is known as:
(A)
Antagonism
(B)
Synergism
(C)
Metabolism
(D)
Anabolism
Question-9
Farmers resort to smoking of unripe fruits for early ripening. This is because of the presence of:
(A)
Auxin
(B)
ABA
(C)
Ethylene
(D)
NAA
Question-10
A growth response to touch is known as:
(A)
Gravitropism
(B)
Thigmotropism
(C)
Chemotropism
(D)
Geotropism
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Cambridge Advanced Grade 12
IGCSE
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