Question

A biology student is investigating tropisms in plants. The student observes the response of the roots of radish seedlings to a light source placed to the right of the roots. All of the roots grow away from the light source. Which of the following tropisms is the student MOST LIKELY investigating?

gravitropism


thigmotropism


hydrotropism


phototropism

Answer 1

phototropism

Step-by-step explanation:

The student was investigating phototropism.

The student wanted to know the response of the roots to light, that is why he exposed them to light.

Roots naturally exhibit two types of tropisms.

The first is gravitropism whereby they tend to grow downwards.

The second is hydrotropism whereby they grow towards the direction of water.

In the above experiment, no water was provided, the roots grew away from the light source but not specifically downwards.