21.
Which of the following is a set of synthetic auxins ?
A:
Indole acetic acid and Naphthalene acetic acid
B:
Indole acetic acid and Indole butyric acid
C:
Indole butyric acid and 2, 4- dischlorophenoxy acetic acid
D:
Naphthalene acetic acid and 2,4 – dischlorophenoxy acetic acid
The answer is:
D