biology - the fundamental unit of life

Class 9 - Biology

The Fundamental Unit of Life

MCQ
Q&A
Question:
What is Endoplasmic Reticulum(ER)? Name its types?
Answer:

The cell organelle, Endoplasmic reticulum (ER) is an extensive, interconnected, membrane-bound network of tubes and sheets. It consists of various channels like cisternae, vesicles and tubules. ER carries materials throughout the cell. There are two type of ERs:
  • Rough Endoplasmic Reticulum (RER) - bears ribosomes, involved in protein synthesis.
  • Smooth Endoplasmic Reticulum (SER) - Does not bear ribosomes, involved in lipid synthesis.


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Questions and Answers


The Fundamental Unit of Life - Questions
1. What is cytoskeleton?
Answer
2. Give an example of anucleate cell i.e. cell without nucleus.
Answer
3. Put dried raisins in plain water and leave them for some time. Then place them in concentrated solution of sugar or salt. What do you observe in both cases?
Answer
4. Which cell organelle is called 'transport system'?
Answer
5. What are chromosomes?
Answer
6. Why can't single cells grow very large? Or Big organisms like human beings are multi-cellular? Why can't such big organisms be a single large cell?
Answer
7. Why is mitochondria absent in red blood cells?
Answer
8. Identify cell organelle and write down its name:
Slipper or oval shaped, its inner membrane is multi-folded and has lot of chemical activity
Answer
9. Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Answer
10. What are the conditions for osmosis?
Answer
11. Which cell organelle is called 'control center'?
Answer
12. Name the cell type that have internal membranes which compartmentalize their functions.
Answer
13. Identify cell organelle and write down its name:
Controls cell division and cell development.
Answer
14. Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Answer
15. Who observed the cells the first time?
Answer
16. Who coined the term 'protoplasm'?
Answer
17. Name the smallest cell in human body.
Answer
18. Name the longest cell in human body.
Answer
19. What are different types transport of components across cell membrane?
Answer
20. What is diffusion?
Answer
21. What happens to a cell (plant cell or animal cell) when placed in the following solutions:
(a) Hypotonic solution
(b) Isotonic solution
(c) Hypertonic solution
Answer
22. What is plasmolysis?
Answer
23. What is the energy currency of the cell called?
Answer
24. Are plastids present in all cells? What are its types?
Answer
25. Name the sac like structure which form the grana?
Answer
26. What are the components nucleus?
Answer
27. Why do we stain cells while observing under microscope? List commonly used stains.
Answer
28. Name the cell organelles involved in synthesis, packaging and movement of protein (or other macromolecules) inside a cell.
Answer
29. Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Answer
30. Identify cell organelle and write down its name:
A network of flattened cavities surrounded by a membrane, which links with the nuclear membrane. Help in packaging proteins.
Answer
31. Identify cell organelle and write down its name:
Powehouse of cell
Answer
32. Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Answer
33. Who proposed the cell theory?
Answer
34. Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Answer
35. In which year electron microscope was invented?
Answer
36. Name the biggest cell in human body.
Answer
37. Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Answer
38. What is the plasma membrane composed of?
Answer
39. Define Passive Transport.
Answer
40. Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Answer
41. Place a de-shelled egg in water for five minutes. What do you observe? (Note: De-shelled egg means,the shell of an egg is removed by dissolving it in dilute hydrochloric acid. The shell is mostly calcium carbonate. A thin outer skin now encloses the egg.)
Answer
42. What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Answer
43. What do you mean by Endocytosis? How does an Amoeba obtain its food?
Answer
44. What is osmoregulation?
Answer
45. Which organ of the plant body helps in osmoregulation?
Answer
46. What are centrosomes? What functions do they perform?
Answer
47. Are Viruses Prokaryotic or Eukaryotic?
Answer
48. What are the functions of Endoplasmic Reticulum (ER)?
Answer
49. What is the function of nucleoplasm?
Answer
50. What is the full form of DNA and RNA?
Answer
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