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Questions and Answers
What is the primary function of light for plants?
What is the characteristic of light that allows us to see objects?
Which of the following is an example of an artificial light source?
What happens when light reaches an object?
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What is necessary for us to see an object directly?
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Why do plants respond to light by growing towards it?
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What is the term for the path of light as it travels?
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What is the definition of an artificial light source?
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What happens when there is an opaque object in the way of an object and our eyes?
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What is the purpose of light for us?
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Study Notes
Properties of Light
- Light is a form of energy that enables us to see things.
- Light is not a matter as it has no mass and occupies no space.
Importance of Light for Plants
- Light is essential for plants to carry out photosynthesis and produce their own food.
- Plants respond to light by growing towards it.
Sources of Light
- Sources of light are objects that emit light on their own.
- We can see them directly when light from the sources enters our eyes.
- Sources of light can be classified into natural and artificial sources.
Natural Sources of Light
- Examples of natural sources of light include the Sun, stars, fireflies, and lightning.
Artificial Sources of Light
- Examples of artificial sources of light include computer screens, candle flames, street lamps, and torchlights.
Behavior of Light
- Light travels in straight lines (light rays) and does not bend around objects.
- If there is no straight path from an object to our eyes (blocked by opaque objects), we cannot see the object directly.
Reflection of Light
- Reflection occurs when light bounces off an object and changes its direction.
- We can see objects that are not light sources when light from a light source is reflected off the object into our eyes.
- Example: seeing our own reflections in a mirror when light from a light source shines on us, is reflected by our body into the mirror, and then into our eyes.
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Description
This quiz explores the characteristics of light, its role in photosynthesis, and how plants respond to it. Learn about sources of light and how it allows us to see things.
