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Question-1
A growth response to touch is known as:
(A)
Gravitropism
(B)
Thigmotropism
(C)
Chemotropism
(D)
Geotropism
Question-2
Name the growth substance used as weedkiller (weedicide).
(A)
Auxin
(B)
ABA
(C)
IBA
(D)
2, 4 , D
Question-3
Dormin refers to:
(A)
Auxin
(B)
NAA
(C)
IAA
(D)
ABA
Question-4
Name the gaseous phytohormone transported through air.
(A)
Auxin
(B)
Ethene
(C)
NAA
(D)
Ethylene
Question-5
Chrysanthemum is an example of:
(A)
Long day plant
(B)
Short day plant
(C)
Day neutral plant
(D)
Vernalised plant
Question-6
Which of the following promote abscission of leaves?
(A)
Auxins
(B)
Ethylene
(C)
ABA
(D)
NAA
Question-7
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-8
Which growth substance is responsible for apical dominance?
(A)
Gibberellins
(B)
Cytokinins
(C)
ABA
(D)
Auxin
Question-9
Two growth substances may reduce each others effect. This is known as:
(A)
Metabolism
(B)
Anabolism
(C)
Antagonism
(D)
Synergism
Question-10
Which of the following is used for stem elongation?
(A)
Cytokinins
(B)
Gibberellins
(C)
ABA
(D)
Auxin
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Cambridge Advanced Grade 12
IGCSE
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