A student conducts an experiment where he places a light source below a plant. Over a three week time period he observes the plant's growth. Which of the following would he observe at the end of the three weeks.

This question lacks options, the options are:

A). Roots would grow up out of the pot and then down towards the light.

B). The plant stem would grow up and roots would grow down.

C). The plant would start to bend over and grow downwards toward the light.

D). The plant would wilt and die.

The answer is C

Explanation:

This question is describing an experiment conducted to test the effect of LIGHT on plants movement, a phenomenon called PHOTOTROPISM. Phototropism is the response of a plant towards a light source.

According to this experiment, a light source is placed below a plant and observed over a three-week time period. At the end of three weeks, the experimenter will observe that "the plant would start to bend over and grow downwards toward the light" because the plants strictly require light to photosynthesize and grow, hence, it will respond by moving in the direction of the available light source.