Questions and Answers
How is surface area different from area?
Surface area measures the total area that covers the surface of a 2D or 3D object, while area measures the space occupied by a 2D shape.
Which quantity does volume measure?
The space occupied by a 3D object
Which of the following is NOT a harmful microorganism?
Probiotics
What role do beneficial microorganisms play in the body?
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How do harmful microorganisms enter the body?
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The classification of microorganisms is based on their characteristics such as:
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What is the main difference between prokaryotes and eukaryotes?
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Which type of microorganism can only reproduce inside the cells of other organisms?
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What is the primary mode of nutrition for fungi?
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Which type of microorganism includes amoebae, flagellates, and slime molds?
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Which type of microorganism is the most diverse and ubiquitous, found in various environments?
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What are examples of beneficial microorganisms mentioned in the text?
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Study Notes
Mensuration Class 8th
Mensuration is an important topic in mathematics that deals with the measurement of different quantities related to geometric shapes and objects. In the 8th grade, students learn about the concepts of surface area, area, perimeter, and volume.
Surface Area
Surface area is the total area that covers the surface of a 2D or 3D object. The surface area can be calculated using various formulas depending on the shape of the object. For example, the formula for the surface area of a sphere is:
$$ A = 4 \pi r^2 $$
where (A) is the surface area and (r) is the radius of the sphere.
Area
Area is the space occupied by a 2D shape. The area can be calculated using various formulas depending on the shape of the object. For example, the formula for the area of a rectangle is:
$$ A = lw $$
where (A) is the area, (l) is the length, and (w) is the width of the rectangle.
Perimeter
Perimeter is the total distance covered by the boundary of a 2D shape. The perimeter can be calculated using various formulas depending on the shape of the object. For example, the formula for the perimeter of a rectangle is:
$$ P = 2l + 2w $$
where (P) is the perimeter, (l) is the length, and (w) is the width of the rectangle.
Volume
Volume is the space occupied by a 3D object. The volume can be calculated using various formulas depending on the shape of the object. For example, the formula for the volume of a cube is:
$$ V = s^3 $$
where (V) is the volume and (s) is the length of the side of the cube.
In summary, mensuration in the 8th grade focuses on understanding and calculating the surface area, area, perimeter, and volume of various geometric shapes using appropriate formulas. These concepts are essential for students to develop a strong foundation in mathematics and problem-solving skills.
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