Question

Negative geotropism in horizontal stems is caused by

• A. accumulation of auxins on the lower side
• B. accumulation of auxins on the upper side
• C. cell shrinkage on the lower side
• D. cell enlargement on the upper side

Answer 1

The correct option is A accumulation of auxins on the lower side

In a horizontally placed plant the auxin accumulation on the lower side of the stem and root apices due to gravity.