CBSE › Class 8 › Science › The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New)
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1. Which plant root nodules contain Rhizobium bacteria?

2. What is Spirulina rich in?

3. Spirulina is a good source of which vitamin?

4. Ever heard of Spirulina? Spirulina, a microalga, is called a superfood because of its health benefits. Spirulina is also a good source of vitamin B12, which is essential for our body. It is rich in protein—more than 60 per cent of its body weight—and only a small amount of fat and sugar. Which of the following is NOT a benefit of Spirulina?

5. Which step involves adding living Spirulina collected from a pond?

6. Why Is Cell Considered to Be a Basic Unit of Life? The body of all living organisms are made up of tiny building blocks called cells. A single cell contains various components that help organisms perform various functions. The bodies of all plants and animals are made up of many cells. Therefore, they are called multicellular (many-celled) organisms. In multicellular organisms, cells carry out specialised functions individually but also cooperate with each other to increase the chance of survival. What are organisms made up of many cells called?

7. Why Is Cell Considered to Be a Basic Unit of Life? Some microorganisms, such as bacteria and protozoa, are made up of just one cell. These are called unicellular (single-celled) organisms. They carry out all the functions necessary for their survival in a single cell. Which of the following is a unicellular organism?

8. Why Is Cell Considered to Be a Basic Unit of Life? Other microbes, like algae and fungi, are made up of one or more cells. For example, yeast is a unicellular fungus while mould is a multicellular fungus. Is mould a unicellular or multicellular fungus?

9. Why Is Cell Considered to Be a Basic Unit of Life? The body of all living organisms are made up of tiny building blocks called cells. A single cell contains various components that help organisms perform various functions. The bodies of all plants and animals are made up of many cells. Therefore, they are called multicellular (many-celled) organisms. In multicellular organisms, cells carry out specialised functions individually but also cooperate with each other to increase the chance of survival. True or False: In multicellular organisms, cells cooperate with each other to increase the chance of survival.

10. Microorganisms are ______-sized organisms and are not visible to the unaided eye.

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