CBSE Class 8 Science The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New) Quiz 10

1. Microorganisms can live in all kinds of environments, and even in the bodies of ______ and animals.

A plants B rocks C machines D clouds

2. Bacteria and protozoans are ______; fungi can be unicellular or multicellular, while plants and animals are multicellular.

A unicellular B multicellular C photosynthetic D heterotrophic

3. The cell is a basic unit of ______.

A life B water C energy D matter

4. The body of all living organisms is made up of ______. A cell contains various components which help the organisms perform their functions and survive.

A cells B bones C organs D tissues

5. A typical cell is bounded by a cell membrane, filled with cytoplasm and contains a ______. Plant, fungal, and bacterial cells have an extra covering, called a cell wall, around the cell membrane. Bacteria lack a well-defined nucleus.

A nucleus B mitochondria C chloroplast D ribosome

6. Cells differ in shape and size. Their shape is related to the ______ performed by them.

A function B location C color D age

7. Bacteria, fungi, and protozoa are different kinds of ______.

A microorganisms B plants C minerals D animals

8. Viruses are also small in size, but they are different from other microorganisms since they reproduce only inside the ______ host organism.

A host B cell C environment D tissue

9. Various parts of a cell are given below. Write them in the appropriate places in the following diagram.

A Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Nucleoid (to be placed in the correct locations in the cell diagram) B Nucleus, Mitochondria, Cell membrane, Cytoplasm, Cell wall, Ribosome (to be placed in the correct locations in the cell diagram) C Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Endoplasmic reticulum (to be placed in the correct locations in the cell diagram) D Nucleus, Chloroplast, Cell membrane, Cytoplasm, Cell wall, Golgi apparatus (to be placed in the correct locations in the cell diagram)

10. Aanandi took two test tubes and marked them A and B. She put two spoonfuls of sugar solution in each of the test tubes. In test tube B, she added a spoonful of yeast. Then she attached two incompletely inflated balloons to the mouth of each test tube. She kept the set-up in a warm place, away from sunlight. What do you predict will happen after 3–4 hours? She observed that the balloon attached to test tube B was inflated. What can be a possible explanation for this?

A Water evaporated in test tube B and filled the balloon with the water vapour. B The warm atmosphere expanded the air inside the test tube B, which inflated the balloon. C Yeast produced a gas inside the test tube B which inflated the balloon. D Sugar reacted with warm air, which produced gas, eventually inflating the balloon.