Question

The above figure shows certain features in pea seedlings growth, increase in horizontal growth and increase in girth. The factor responsible for such effect must be :-

• A. $Light$
• B. ${CO}_2$
• C. $Auxin$
• D. $Ethylene$

Answer 1

The correct option is A $Light$

There are four primary factors that affect plant growth: light, water, temperature and nutrients. These four elements affect the plant's growth hormones, making the plant grow more quickly or more slowly. They are abiotic components, including topography and soil, of the environmental factors that influence plant growth and development. Changing any of the four can cause the plant stress which stunts or changes growth, or improves growth. The seedlings respond to sunlight and hence the growth of the seedlings was horizontal and there was an increase in girth.

So the correct option is 'light'.