Summarize the following in 2 sentences or less using your own words:
When plants grow toward something it is called a positive tropism; when they grow away from something, it is called negative tropism. Stems and leaves are positively phototrophic, which means they grow toward light. This is called phototropism. Phototropism is plant growth toward a light source. Roots are negatively phototropic, they grow away from the light. Roots grow into the soil. Roots always grow downward into soil because specialized cells (Links to an external site.) in root caps detect and respond to gravity, so they have positive gravitropism – meaning the roots grow into the soil with the force of gravity. Leaves and stems have negative gravitropism because they grow against the force of gravity. Growing toward gravity is called geotropism. A couple of other tropisms are thigmotropism and hydrotropism. Thigmotropism is the response plants have to touch and hydrotropism the response plants roots have toward water If a plant moves away from touch, it is called positive thigmotropism, if they move towards touch it is called positive thigmotropism. If plant roots grow toward water it is called positive hydrotropism, whereas if they grow away from water it is called negative hydrotropism.
Answers
Explanation:
When plants grow toward something it is called a positive tropism; when they grow away from something, it is called negative tropism. Stems and leaves are positively phototrophic, which means they grow toward light. This is called phototropism. Phototropism is plant growth toward a light source. Roots are negatively phototropic, they grow away from the light. Roots grow into the soil. Roots always grow downward into soil because specialized cells (Links to an external site.) in root caps detect and respond to gravity, so they have positive gravitropism – meaning the roots grow into the soil with the force of gravity. Leaves and stems have negative gravitropism because they grow against the force of gravity
Answer:
Phototropism is one of the many plant tropisms or movements which respond to external stimuli. Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism (skototropism).