Statement I: | Anton von Leeuwenhoek first saw and described a live cell and Robert Brown discovered nucleus. |
Statement II: | The invention of electron microscope revealed all the structural details of the cell. |
1. | Statement I is correct and Statement II is incorrect |
2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
3. | Both Statement I and Statement II are correct and Statement II correctly explains Statement I |
4. | Only Statement II is correct |
I: | All living organisms are composed of cells and products of cells |
II: | Cells of living organisms may or may not have cell walls |
III: | All cells arise from pre-existing cells |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
1. | Only I and II | 2. | Only I |
3. | Only II and III | 4. | Only III |
I: | bound by a single membrane only |
II: | found in all cells – both eukaryotic as well as prokaryotic |
III: | found in cytoplasm as well as chloroplasts, mitochondria and on RER |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
1. | is a non- membrane bound organelle found in all cells which helps in cell division |
2. | is a non- membrane bound organelle found in plant cells which helps in cell division |
3. | is a non- membrane bound organelle found in animal cells which helps in DNA replication |
4. | is a non- membrane bound organelle found in animal cells which helps in cell division |
1. | 0.3 µm | 2. | 3.0 µm |
3. | 5.0 µm | 4. | 7.0 µm |
1. | Bacillus | Rod shaped |
2. | Coccus | Spherical |
3. | Vibrio | Icosahedral |
4. | Spirillum | Spiral |
1. | 0.1 to 0.3 µm | 2. | 0.02 to 0.3 µm |
3. | 1 to 10 µm | 4. | 1 to 2 µm |
I: | The outermost layer of the cell envelope is called as the glycocalyx which may be present as a loose sheath called the slime layer or a thick and tough capsule. |
II: | The cell wall determines the shape of the cell and provides a strong structural support to prevent the bacterium from bursting or collapsing. |
III: | Plasma membrane is selectively permeable in nature and interacts with the outside world. |
IV: | Bacterial cells can be classified as Gram positive and Gram negative based on the staining properties of their plasma membrane. |
1. | All except IV | 2. | Only I and II |
3. | I, II, III and IV | 4. | Only II, III and IV |