1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Dr. F. went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?
A
It made possible the isolation and exact identification of auxin.
B
It is the basis for quantitative determination of small amounts of growth-promoting substances.
C
It supports the hypothesis that 1AA is auxin.
D
It demonstrated polar movement of auxins.
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white -coloured like albinos. Which of the following terms will you use to describe them?
A
Mutated
B
Embolised
C
Etiolated
D
Defoliated
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following growth regulators is known as 'stress hormone'?
A
Abscisic acid
B
Ethylene
C
GA3
D
Indole acetic acid
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Select the option which is not correct with respect to enzyme action.
A
Substrate binds with enzyme at its active site.
B
Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
C
A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
D
Malonate is a competitive inhibitor of succinic dehydrogenase.
EXAM MAP