1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Cell elongation in internodal regions of the green plants takes place due to
A
indole acetic acid
B
cytokinins
C
gibberellins
D
ethylene.
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
A
Long day
B
Darkness neutral
C
Day neutral
D
Short day
3
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.
4
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
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