Question:
Are plastids present in all cells? What are its types?
Answer:
Plastids are present only in plant cells. Based on colour pigments, there are three types of plastids:
- Leucoplasts: White or colourless.
- Chromoplast: Coloured like blue, red, yellow.
- Chloroplast: Green in colour.
The Fundamental Unit of Life
Q 1.
What is the full form of DNA and RNA?
Q 2.
Which organelle of the cell in animals helps in osmregulation?
Q 3.
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.
Q 5.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 6.
Identify cell organelle and write down its name:
Slipper or oval shaped, its inner membrane is multi-folded and has lot of chemical activity
Q 7.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 8.
Name the sac like structure which form the grana?
Q 9.
What is the plasma membrane composed of?
Q 10.
Which cell organelle is known as 'protein factory'?
Q 11.
When chromosomes are visible in the nucleus?
Q 12.
Which cell organelle is called 'kitchen of plant'?
Q 13.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 14.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 15.
Name the two postulates of the cell theory.
Q 16.
What are the components nucleus?
Q 17.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 18.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 19.
Who observed the cells the first time?
Q 20.
Name the biggest cell in human body.
Q 21.
Is plasma membrane permeable or selectively permeable?
Q 22.
What are the function of nucleus?
Q 23.
What is the thickness of cell membrane?
Q 24.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 25.
Who coined the term 'protoplasm'?
Q 26.
What are different types transport of components across cell membrane?
Q 27.
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.)
Q 28.
Who is known as Father of Biology?
Q 29.
What are the conditions for osmosis?
Q 30.
Will the temperature have any effect on the process of the osmosis?
Q 31.
Which organ of the plant body helps in osmoregulation?
Q 32.
What are the functions of Endoplasmic Reticulum (ER)?
Q 33.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 34.
Why is mitochondria absent in red blood cells?
Q 35.
In which year electron microscope was invented?
Q 36.
Name the smallest cell in human body.
Q 37.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 38.
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?
Q 39.
Are plastids present in all cells? What are its types?
Q 40.
What is osmoregulation?
Q 41.
What are centrosomes? What functions do they perform?
Q 42.
What are chromosomes?
Q 43.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 44.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 45.
Identify cell organelle and write down its name:
A partially permeable layer prevents cell contents from escaping controls what substances enter and leave the cell. Identify?
Q 46.
Identify cell organelle and write down its name:
Powehouse of cell
Q 47.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 48.
Name the book in which Robert Hooke published his observations about cork cells.
Q 49.
Who discovered nucleus in the cell?
Q 50.
Name the world's smallest cell.
