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Questions and Answers
What is the function of the revolving nosepiece in a compound light microscope?
What is the function of the revolving nosepiece in a compound light microscope?
- To move the stage
- To focus the microscope
- To adjust the light source
- To hold and rotate the objective lenses (correct)
What is the purpose of the coarse-adjustment knob in a microscope?
What is the purpose of the coarse-adjustment knob in a microscope?
- To move the stage
- To change the objective lenses
- To adjust the light source
- To focus the microscope (correct)
What is the function of the condenser lens in a microscope?
What is the function of the condenser lens in a microscope?
- To focus the light onto the object (correct)
- To magnify the image
- To move the stage
- To adjust the light source
What is the purpose of the stage in a microscope?
What is the purpose of the stage in a microscope?
What is the function of the light source in a microscope?
What is the function of the light source in a microscope?
What is the purpose of the fine-adjustment knob in a microscope?
What is the purpose of the fine-adjustment knob in a microscope?
What is the function of the eyepiece in a microscope?
What is the function of the eyepiece in a microscope?
What is the proper way to change objective lenses in a microscope?
What is the proper way to change objective lenses in a microscope?
Why might a biologist think that the cell is the most important characteristic of living organisms?
Why might a biologist think that the cell is the most important characteristic of living organisms?
What characteristic of living things is shown in the example of a cat purring when petted?
What characteristic of living things is shown in the example of a cat purring when petted?
How are a dandelion and a deer alike?
How are a dandelion and a deer alike?
What is one way to persuade the alien visitor that cars are not alive?
What is one way to persuade the alien visitor that cars are not alive?
What is the purpose of a microscope?
What is the purpose of a microscope?
What is the minimum size of an object that can be seen with the unaided eye?
What is the minimum size of an object that can be seen with the unaided eye?
What is true about the dots in the circle of dots?
What is true about the dots in the circle of dots?
What is the reason why we cannot see certain living things around us?
What is the reason why we cannot see certain living things around us?
What remains stacked together solidly even after the cells have ceased to carry out their living functions?
What remains stacked together solidly even after the cells have ceased to carry out their living functions?
What are the structures in which photosynthesis takes place?
What are the structures in which photosynthesis takes place?
What is the main function of vacuoles?
What is the main function of vacuoles?
What is the energy source used in photosynthesis?
What is the energy source used in photosynthesis?
Which of the following is NOT a living part of a tree?
Which of the following is NOT a living part of a tree?
What surrounds vacuoles?
What surrounds vacuoles?
What is the product of photosynthesis?
What is the product of photosynthesis?
Where are chloroplasts typically found?
Where are chloroplasts typically found?
What is the first step in measuring the diameter of the field of view?
What is the first step in measuring the diameter of the field of view?
Why are millimetre markings on the ruler not suitable for direct measurement of the field of view for lenses with magnification higher than 10×?
Why are millimetre markings on the ruler not suitable for direct measurement of the field of view for lenses with magnification higher than 10×?
What is the correct way to unplug the microscope?
What is the correct way to unplug the microscope?
What should you do before measuring the diameter of the field of view?
What should you do before measuring the diameter of the field of view?
Why do you need to calculate the field of view for a higher magnification?
Why do you need to calculate the field of view for a higher magnification?
What is the purpose of using a clear plastic ruler on the microscope stage?
What is the purpose of using a clear plastic ruler on the microscope stage?
What should you do after setting the microscope to the low-power objective?
What should you do after setting the microscope to the low-power objective?
What is the unit of measurement for the diameter of the field of view?
What is the unit of measurement for the diameter of the field of view?
What is the primary function of the cell membrane structure?
What is the primary function of the cell membrane structure?
What happens to the ink particles in the container over time?
What happens to the ink particles in the container over time?
What is an example of diffusion in everyday life?
What is an example of diffusion in everyday life?
What is the name of the model that describes the constant movement of particles in all liquids and gases?
What is the name of the model that describes the constant movement of particles in all liquids and gases?
Can solids diffuse?
Can solids diffuse?
What is the purpose of demonstrating the mixture of water and sand in two bags?
What is the purpose of demonstrating the mixture of water and sand in two bags?
What is the term for the movement of substances from an area of high concentration to an area of low concentration?
What is the term for the movement of substances from an area of high concentration to an area of low concentration?
What happens when the top of a perfume bottle is removed?
What happens when the top of a perfume bottle is removed?
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Study Notes
Characteristics of Living Organisms
- Biologists consider cells as the most important characteristic of living organisms.
Characteristics of Living Things
- A cat purrs when petted, showing response to stimuli.
- A robin eats a worm, exhibiting nutrition.
- A plant gives off oxygen, demonstrating respiration.
- A runner sweats after a race, showing response to stimuli.
Dandelion and Deer Comparison
- Both the dandelion and the deer are living things.
- However, the dandelion is a plant, while the deer is an animal.
Automobiles vs. Living Things
- Automobiles may seem to exhibit characteristics of living things, such as movement, consumption of energy, and waste production, but they are not alive.
- They do not grow, reproduce, or respond to stimuli in the same way living organisms do.
Microscopes and Cells
- Microscopes are used to enlarge objects too small to be seen with the unaided eye.
- The human eye can only see objects larger than 0.1 mm.
- A compound light microscope has parts such as the eyepiece, tube, coarse-adjustment knob, fine-adjustment knob, revolving nosepiece, objective lenses, stage, condenser lens, diaphragm, and light source.
Using a Microscope
- To use a microscope, set it to low-power objective and place a clear plastic ruler on the stage.
- Focus on the ruler and measure the diameter of the field of view in millimeters.
Cell Structure
- Cell walls remain stacked together solidly, even after cells have ceased to carry out their living functions.
- The only living parts of a tree are the leaves, growing tips of branches and roots, a thin layer of cells just under the bark, and the pith in the centre of the roots and branches.
Cellular Components
- Vacuoles are balloon-like spaces within the cytoplasm, used for storage of surplus food, wastes, and other substances.
- Chloroplasts are structures where photosynthesis takes place, using energy from the Sun to make carbohydrates.
Diffusion
- Diffusion is the movement of substances from an area of high concentration to an area of low concentration.
- It occurs in situations such as a sugar cube dissolving in water or fumes of perfume rising from a bottle.
- Solids cannot diffuse, but their particles can move through a liquid or gas.
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