CBSE Class 8 Science The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New) Quiz 3

1. The cell membrane, cytoplasm, and nucleus are important in a cell because they perform essential functions for the maintenance of life. Which of the following best describes their roles?

A They regulate entry and exit of substances, provide a medium for chemical reactions, and control cellular activities. B They store energy, produce proteins, and transport waste. C They create cell walls, synthesize DNA, and break down nutrients. D They generate electrical impulses, absorb sunlight, and produce hormones.

2. Fill in the blank: The outer layer of a human cheek cell is called the ________.

A cell membrane B nucleus C cytoplasm D mitochondria

3. Fill in the blank: The space between the cell membrane and nucleus is filled with ________.

A cytoplasm B mitochondria C ribosomes D nucleolus

4. Which of the following is NOT a basic part of a human cheek cell?

A Cell membrane B Cytoplasm C Nucleus D Cell wall

5. Most of the life processes take place within the cytoplasm.

A True B False

6. Fill in the blank: The green color in plant cells is due to the presence of _________.

A chloroplasts B mitochondria C ribosomes D nucleus

7. Which part is present in plant cells but not in animal cells?

A A) Cell wall B B) Nucleus C C) Cytoplasm D D) Mitochondria

8. Muscle cells and nerve cells have both similarities and differences. Which of the following best describes these similarities and differences?

A Both muscle cells and nerve cells are specialized cells, but muscle cells contract while nerve cells transmit signals. B Muscle cells and nerve cells are identical in structure and function. C Muscle cells transmit electrical signals, while nerve cells contract to produce movement. D Neither muscle cells nor nerve cells are specialized for any function.

9. Vacuoles are usually large in plant cells and small or absent in animal cells.

A True B False

10. Cells look different from each other because their shape and structure relate to their function.

A Cells look different because their shape and structure relate to their function. B Cells look different because they all perform the same function. C Cells look different because they are randomly shaped. D Cells look different because they do not have any function.