Table of Contents
What does phototropism mean in science?
Medical Definition of phototropism : a tropism in which light is the orienting stimulus — see heliotropism. 2 : the reversible change in color of a substance produced by the formation of an isomeric modification when exposed to radiant energy (as light)
What does the word phototropism come from?
phototropism Add to list Share. Phototropism combines the Greek photo, or “light,” and tropism, “tendency of an animal or plant to move in response to a stimulus,” from the Greek tropos, “a turning.”
How does phototropism occur?
The process of phototropism is the growth of an entity in response to a light stimulus. Tips of leaves and stems contain auxin, causing them to positively grow towards the light. In this phenomena, the plant grows towards the sunlight hence the plant body grows in this process.
Is phototropism positive or negative?
In the plant stem, responses to light are known as a positive phototropism, which means the stem grows towards the light. In the plant root, responses to light are known as a negative phototropism, which means the root grows away from the light.
What are facts about phototropism?
Phototropism is growth in the direction of light. Phototropism is common in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a plant growth hormone called auxin, which causes phototropism to occur. It causes the plant to have elongated cells on the farthest side from the light.
What are the advantages of phototropism?
Promotes food production in plants by photosynthesis
What are some examples of phototropism?
Examples of phototropism. Some examples of phototropism are the following: The ficus cause their roots to migrate out looking for water sources so when they emerge under streets or pavement, they break the cement and pipes in their path until they reach what they need. This is an example of positive phototropism.
Positive phototropism is the response of a plant toward a light source, while negative phototropism (also called “aphototropism ”) causes growth in the opposite direction. Plant roots usually use negative phototropism although additionally they use “ gravitropism ”, which is the response to gravitational pull.