SCIENCE CHAPTER- 8

CELL STRUCTURE AND FUNTIONS 

Q.1. Name the following:

1. Functional unit of DNA.

2. Control Centre of cell.

3. Undefined nuclear region of prokaryotic cell.

4. An enucleate cell.

5. Jelly like substance between cell membrane and nucleus.

Q.2. Give reasons:

1. What will happen to a cell if its nucleus is removed?

2. Plastids are called as “Kitchen of plant cells”.

3. Mitochondria are called as power house of the cell.

4. Lysosomes are called as suicidal bags of the cell.

Q/A

1. Differences between plant and animal cell.

2. Differences between prokaryotes and eukaryotes on the basis of cell wall, mitochondria and nucleus.

3. Difference between cell membrane and nuclear membrane.

Short answer questions:

1. State two functions of centralised vacuoles.

2. What are prokaryotic cells. Give two examples of prokaryotes?

3. To study the differences in the structure of plant and animal cells the science teacher provided two temporary slides to Sanjeev to observe under the microscope.

a) Which solution should the teacher use to make the structure of the cells visible under the microscope?

b) How will Sanjeev identify the difference between the plant cell and Animal cell?

4. Explain the function of the cell wall and flagellum.

5.Name the thread like structure protruding from the cell membrane of some prokaryotes.

6.Describe the shape of Mitochondria .

7. What is the function of Endoplasmic reticulum ?

8. State the functions of Golgi bodies.

9. A slide stained with safranin is observed under the microscope. What will be the colour of the

nucleus seen?