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Question-1
Which of the following is a gaseous plant growth substance?
(A)
Ethylene
(B)
Auxin
(C)
IBA
(D)
ABA
Question-2
Which plant growth substance promote stomatal closure?
(A)
ABA
(B)
Auxin
(C)
Gibberellins
(D)
Ethylene
Question-3
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-4
Commercial use of synthetic auxin in cuttings is to stimulate the growth of:
(A)
Roots
(B)
Leaves
(C)
Flowers
(D)
Buds
Question-5
Which of the following promote abscission of leaves?
(A)
Auxins
(B)
Ethylene
(C)
ABA
(D)
NAA
Question-6
For flowering, long day plants need:
(A)
Lengthy day period
(B)
Lengthy dark period
(C)
Short day period
(D)
Neutral
Question-7
Went's experiments were done with shoots of:
(A)
Oats
(B)
Barley
(C)
Rice
(D)
Wheat
Question-8
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-9
Chrysanthemum is an example of :
(A)
Long day plant
(B)
Short day plant
(C)
Day neutral plant
(D)
Vernalised plant
Question-10
Name the growth substance used as weedkiller (weedicide).
(A)
Auxin
(B)
ABA
(C)
IBA
(D)
2, 4 , D
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Cambridge Advanced Grade 11
IGCSE
Practice in Related Chapters
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Gas Exchange
Evolution
Transport in Mammals
Transport in Plants
Respiration
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