1
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For its action, nitrogenase requires
A
high input of energy
B
light
C
Mn2+
D
super oxygen radicals.
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Read the following four statements (A $$-$$ D). phosphorylation involve uphill transport of protons across the membrane.
(A)  Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
(B)  In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
(C)  Stamens in flowers of Gloriosa and Petunia are polyandrous.
(D)  Symbiotic nitrogen fixers occur in free-living state also in soil.

How many of the above statements are right?
A
Two
B
Three
C
Four
D
One
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Through their effects on plant growth regulators, what do the temperature and light control in the plants?
A
Apical dominance
B
flowering
C
Closure of stomata
D
Fruit elongation
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Which one of the following generally acts as an antagonist to gibberellins?
A
Zeatin
B
Ethylene
C
ABA
D
IAA
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