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Questions and Answers
What is the primary function of a concave lens?
Which of the following is an example of a simple machine?
Which of the following best describes the role of mitochondria in a cell?
What is the primary function of a convex lens?
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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?
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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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Description
Test your knowledge of simple machines, lenses, and cell organelles with this Class 10 science quiz. See if you can identify examples of simple machines, understand the function of concave lenses, and describe the role of mitochondria in a cell.
