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Question-1
Which of the following is used for stem elongation?
(A)
Cytokinins
(B)
Gibberellins
(C)
ABA
(D)
Auxin
Question-2
Which of the following promote abscission of leaves?
(A)
Auxins
(B)
Ethylene
(C)
ABA
(D)
NAA
Question-3
Commercial use of synthetic auxin in cuttings is to stimulate the growth of:
(A)
Roots
(B)
Leaves
(C)
Flowers
(D)
Buds
Question-4
Choose the correct statement from the following.
(A)
In dark there is more P
fr
than P
r
(B)
In dark, there is more P
r
than P
fr
(C)
In dark no P
r
or P
fr
(D)
In light, there is more P
r
than P
fr
Question-5
Which of the following is true?
(A)
P
r
is needed for seed germination
(B)
P
fr
is needed for seed germination
(C)
High temperature is needed for seed germination
(D)
High enzyme content is needed for seed germination
Question-6
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-7
Which plant growth substance promote stomatal closure?
(A)
ABA
(B)
Auxin
(C)
Gibberellins
(D)
Ethylene
Question-8
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-9
Which hormone promotes fruit ripening?
(A)
Auxin
(B)
Ethylene
(C)
Gibberellins
(D)
Cytokinin
Question-10
For flowering, long day plants need:
(A)
Lengthy day period
(B)
Lengthy dark period
(C)
Short day period
(D)
Neutral
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Cambridge Advanced Grade 12
IGCSE
Practice in Related Chapters
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Gas Exchange
Evolution
Transport in Mammals
Respiration
Heterotrophic Nutrition
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