You notice that your houseplants are all growing toward the light from your window. This indicates that their stems display:

Question

Quizplus · Accepted Answer

The plants are growing towards the light source, which indicates positive phototropism. Positive gravitropism would involve the roots growing towards the ground, and negative phototropism would involve the plant growing away from the light source. There is no indication that temperature is affecting the plant growth, so B is incorrect, and E is also incorrect as it would mean the plant is growing away from the ground.

You Notice That Your Houseplants Are All Growing Toward the Light