Chhattisgarh State Board Class 9 Science Chapter 6 Fundamental Unit of Life : Cell Exercise Multiple Choice, Fill in the Blanks, Questions and Answers here.
Chhattisgarh State Class 9 Science Chapter 6 Solution
1) Choose the correct option
i) Name ‘cell’ was given by one of the following-
(a) Robert Hooke (b) Robert Brown
(c) Leeuwenhoek (d) Fleming.
Ans: – option (a) Robert Hook.
ii) Cell theory was proposed by-
(a) Shielded, Schwann and Virchow
(b) Watson and Crick
(c) Darwin and Wallace
(d) Mendel and Morgan.
Ans: – option (a).
iii) Single layered membrane is found in-
(a) Mitochondria (b) Chloroplast
(c) Lysosome (d) None of the above.
Ans: – option (c).
iv) Cellulosic cell wall is not present in one of the following-
(a) Bacteria (b) Cells of Hydrilla
(c) Cells of Mango plant (d) Cells of Cactus.
Ans: – option (b) cells of Hydrilla.
v) Prokaryotic cell has one of these-
(a) Mitochondria (b) Ribosome
(c) Plastid (d) Lysosome.
Ans: – option (b).
2) Draw a typical plant cell and label the following parts-
(a) Cell wall (b) Nucleus (c) Chloroplast (d) Vacuole.
Ans: –
3) Write a difference between cell wall and cell membrane.
Ans: –
| Cell wall | Cell membrane |
| It protected the cell from external damage. | The cell protected from internal by cell membrane. |
| It is thick as compared to cell membrane. | It is thin as compared to cell wall. |
| It is active metabolically. | It is inactive. |
4) Draw a labelled diagram of a typical animal cell.
Ans: –
5) How are prokaryotic cells different from eukaryotic cells?
Ans: –
|
Prokaryotic cell |
Eukaryotic cell |
| Smaller in size. | Larger in size. |
| Endoplasmic reticulum, mitochondria, Golgi body are absent. | All the different organelles are present. |
| Nucleolus is absent
|
Nucleolus is present. |
6) Explain how the cell theory clarifies our understanding of the cell?
Ans: – The millions of cells which present in our body or in any plant and animal makes a complete body or structure. The new cell are produces from the old cell. So, any cell and the previous cell are linked up by their structure. The complete structure of any body is made up with the different types of cells.
7) Write two similarities and differences between mitochondria and chloroplast.
Ans: – There are similarities in between the mitochondria and chloroplasts like –
- Both produces energy for working of cell.
- Both have similar structure like inner and outer membrane.
8) Write the names of those plant parts that contain colourless plastids, chloroplasts, other colouredplastids (those other than chloroplast).
Ans: – Leucoplast: – root, underground stem etc.
Chloroplast: – algae.
Chromoplast: – tomato, carrots etc.
9) Explain the function of endomembrane system.
Ans: – The endoplasmic reticulum are two types like rough endoplasmic reticulum and smooth endoplasmic reticulum. The smooth endoplasmic reticulum synthesis serum proteins, hormone. The rough endoplasmic reticulum synthesis lipid and steroids etc.
10) Why are cells usually small?
Ans: – The smaller cell ismaximizing the ratio of the area to volume ratio. The smaller cell allows more molecules and ion to the different cell of the organism’s cytoplasm.
11) We add salt while cooking vegetables. As soon as we add salt, we find water coming out. Explainwhy this happens.
Ans: – The salt is mixed while cooking vegetables forhelpful in boiling. The salt mixing with the water makes the solution hypnotic in which the water present in vegetables comes out as a result of that it boiled quickly.
12) What will happen if –
(i) There is no nucleus in a cell.
Effect: – The control of the working of different cell will hampered. The cell division will not be happening in that anymore. The cell will not be survived properly.
(ii) Plasma membrane of the cell bursts.
Effect: – The diffusion and the osmosis will not happen in that cell anymore if the plasma membrane of the cell burst. As a result of that the different material exchange between the roots to the soil will nit happen. And after some times the cell will be dead.
(iii) Boil a Rheo leaf in water and put it in concentrated sugar solution.
Ans: – The water from the leaf will come out when it out for boiling in water. The osmosis reaction is happening while putting it in water. And if the sugar is added to the water, then the osmosis process will not be happening any more.
(iv) Golgi body is removed from the cell.
Ans: – The Golgi body increase the cell division in the cell membrane. So if it removed from the cell the growth of the cell membrane will not happening more.The plasma membrane will be affected.
