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Question-1
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-2
Which of the following is a gaseous plant growth substance?
(A)
Ethylene
(B)
Auxin
(C)
IBA
(D)
ABA
Question-3
Gibberellins promote seed germination by:
(A)
Activating the enzymes for respiration
(B)
Activating the process of inhibition
(C)
Activating the production of amylase
(D)
Activating cell division
Question-4
Name the growth substance used as weedkiller (weedicide).
(A)
Auxin
(B)
ABA
(C)
IBA
(D)
2, 4 , D
Question-5
Two growth substances may reduce each others effect. This is known as:
(A)
Metabolism
(B)
Anabolism
(C)
Antagonism
(D)
Synergism
Question-6
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-7
Which plant growth substance promote stomatal closure?
(A)
ABA
(B)
Auxin
(C)
Gibberellins
(D)
Ethylene
Question-8
For flowering, long day plants need:
(A)
Lengthy day period
(B)
Lengthy dark period
(C)
Short day period
(D)
Neutral
Question-9
Which of the following is " stress hormone"?
(A)
Auxin
(B)
2, 4, D
(C)
ABA
(D)
Ethylene
Question-10
Two growth substances may act together to produce a larger effect. This is known as:
(A)
Antagonism
(B)
Synergism
(C)
Metabolism
(D)
Anabolism
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Cambridge Advanced Grade 12
IGCSE
Practice in Related Chapters
Transport in Plants
Regulations and Control
DNA and Protein Synthesis
The Molecules of Life
Photosynthesis and Plant Nutrition
Enzymes
Genetics
Cell
Cell Division
Ecology
Animal Nutrition
Reproduction in Animals
Gas Exchange
Evolution
Transport in Mammals
Respiration
Heterotrophic Nutrition
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