1
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Nicotiana sylvestris flowers only during long days and N.tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N.sylvestris and N.tabacum to be separate species?
A
They cannot interbreed in nature
B
They are reproductively distinct
C
They are physiologically distinct
D
They are morphologically distinct
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
A
auxin
B
cytokinin
C
ethylene
D
abscisic acid.
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Seed dormancy is due to the
A
ethylene
B
abscisic acid
C
IAA
D
starch.
4
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Dwarfness can be controlled by treating the plant with
A
cytokinin
B
gibberellic acid
C
auxin
D
antigibberellin.
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