CBSE Class 8 Science The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New) Quiz 21

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CBSE › Class 8 › Science › The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New)

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1. In Activity 2.8, what is the purpose of adding yeast powder to bowl A but not to bowl B?

A To make the dough taste better B To compare the effect of yeast on the dough C To make the dough harder D To change the color of the dough

2. What is the next step after mixing flour and sugar in both bowls during Activity 2.8?

A Add water to both bowls B Knead the flour of the two bowls with warm water to make soft dough C Bake the dough D Freeze the dough

3. What environmental problem did Ananda Mohan Chakrabarty’s invention help solve?

A Air pollution B Oil spills C Water scarcity D Deforestation

4. What is the significance of comparing the results of two bowls in Activity 2.8?

A To see which bowl is heavier B To observe the effect of yeast on dough formation C To find out which bowl has more sugar D To check the color change in the dough

5. What is the main reason dough rises and becomes fluffy when yeast is added?

A Yeast produces carbon dioxide which forms bubbles in the dough. B Yeast absorbs water and expands the dough. C Yeast makes the dough heavier. D Yeast changes the color of the dough.

6. To test curd formation, why is it important to keep one bowl of milk in a warm place and the other in a cool place?

A To see how temperature affects curd formation. B To make the milk taste different. C To change the color of the milk. D To make the milk boil faster.

7. Which group of microorganisms does yeast belong to?

A Fungi B Bacteria C Viruses D Algae

8. What is the special property of yeast that is used in making breads, cakes, and other foods?

A Yeast produces carbon dioxide and alcohol, making dough soft and fluffy. B Yeast changes the color of the dough. C Yeast makes the dough hard. D Yeast cools the dough.

9. Which part of the cell controls all its activities?

A Cell membrane B Cytoplasm C Vacuole D Nucleus

10. Which of the following is present only in plant cells?

A Nucleus B Cytoplasm C Chloroplast D Cell membrane

Practice more on The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New)

Quiz 1 Quiz 2 Quiz 3 Quiz 4 Quiz 5 Quiz 6 Quiz 7 Quiz 8 Quiz 9 Quiz 10 Quiz 11 Quiz 12 Quiz 13 Quiz 14 Quiz 15 Quiz 16 Quiz 17 Quiz 18 Quiz 19 Quiz 20 Quiz 21 Quiz 22 Quiz 23 Quiz 24 Quiz 25 Quiz 26 Quiz 27 Quiz 28

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