Putting Roots Down

A plant's response to any stimulus

The movements in a plant in response to light

The diagram shows a plant growing near a window. How can the plant's reaction best be described?

The movement of roots toward the ground or the movement of stems away from the ground

Why does a plant stem grow upward away from the soil?

What causes plants to bend toward the sunlight?

Scientists on a space shuttle mission studying plant growth would probably see that the plants on the space shuttle do not grow in the same direction and pattern as those on Earth. Scientists working in space would MOST LIKELY be studying the effects of which of the following stimuli on plant growth?

Billy orders a plant for his garden. When it was delivered, the roots and the plant stem were not growing straight out of the clay pot. Instead, the direction of their growth was in a 'sideways' direction. The diagram shows the direction the plant was growing when it was received by Billy.

Why is the most likely reason for the direction of the plant growth?

Trees that grow in a forest tend to grow very tall, with few branches. The same species of tree grown in an open area tends to grow shorter and wider, with many branches. The stimulus responsible for these different growth patterns is the amount of —

If the top portion of plants grow "up," explain why a small tree on a hillside does not grow straight out from the hillside?