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Questions and Answers
What is the primary function of a concave lens?
What is the primary function of a concave lens?
- To magnify objects
- To reflect light
- To reduce the size of objects (correct)
- To split light into different colors
Which of the following is an example of a simple machine?
Which of the following is an example of a simple machine?
- Television
- Book
- Scissors (correct)
- Pencil
Which of the following best describes the role of mitochondria in a cell?
Which of the following best describes the role of mitochondria in a cell?
- Energy production (correct)
- Waste removal
- Protein synthesis
- Cell division
What is the primary function of a convex lens?
What is the primary function of a convex lens?
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Which of the following is an example of a compound machine?
Which of the following is an example of a compound machine?
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Which of the following best describes the role of chloroplasts in a plant cell?
Which of the following best describes the role of chloroplasts in a plant cell?
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Study Notes
Primary Functions of Lenses
- Concave lenses diverge light rays, causing them to spread out. Used in applications like glasses for nearsightedness.
- Convex lenses converge light rays, bringing them together to a focal point. Commonly used in magnifying glasses and cameras.
Simple and Compound Machines
- A simple machine consists of basic mechanical devices like levers, pulleys, or inclined planes that make work easier. Example: lever.
- A compound machine is a combination of two or more simple machines working together. Example: bicycle.
Cellular Organelles
- Mitochondria are the powerhouses of the cell, converting nutrients into energy (ATP) through cellular respiration.
- Chloroplasts are essential for photosynthesis in plant cells, converting sunlight into chemical energy using chlorophyll.
Summary of Cell Functions
- Mitochondria function primarily to produce energy that fuels cellular activities.
- Chloroplasts enable plants to harness sunlight, contributing to growth and energy storage.
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