Question

Doug plants a few peas. After two days, he sees the shoot and the root forming. He observes that the shoot grows upward, toward the light. The root grows downward, into the soil. Why do these embryonic organs grow in a specific direction?
The shoot is positively phototropic and positively gravitropic; the root is positively phototropic and positively gravitropic.
The shoot is positively phototropic and negatively gravitropic; the root is positively gravitropic and negatively phototropic.
The shoot is positively gravitropic and negatively phototropic; the root is positively phototropic and negatively gravitropic.

Answer 1

I would say B) The shoot is positively phototropic and negatively gravitropic; the root is positively gravitropic and negatively phototropic.

This is because the shoot of the plant is attracted towards the sun, as the chloroplasts in the leaves need sunlight to make food. As well, the roots are attracted downward to absorb more water and minerals from the sun.