Question:
What are chromosomes?
Answer:
Chromosomes are compact rod like bodies, which are formed at the time of cell division from chromatin material. They are made up of DNA and carry genes (unit of inheritance).
The Fundamental Unit of Life
Q 1.
Which cell organelle is known as 'protein factory'?
Q 2.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 3.
Is plasma membrane permeable or selectively permeable?
Q 4.
Are plastids present in all cells? What are its types?
Q 5.
Which cell organelle is called 'kitchen of plant'?
Q 6.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 7.
What is the full form of DNA and RNA?
Q 8.
Name the two postulates of the cell theory.
Q 9.
What is the plasma membrane composed of?
Q 10.
What are chromosomes?
Q 12.
Name the sac like structure which form the grana?
Q 13.
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 14.
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 15.
Who observed the cells the first time?
Q 16.
What are different types transport of components across cell membrane?
Q 17.
What are the function of nucleus?
Q 18.
Give an example of anucleate cell i.e. cell without nucleus.
Q 19.
Name the biggest cell in human body.
Q 20.
Will the temperature have any effect on the process of the osmosis?
Q 21.
Why is mitochondria absent in red blood cells?
Q 23.
Name the smallest cell in human body.
Q 24.
What are the conditions for osmosis?
Q 25.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 26.
Who proposed the cell theory?
Q 27.
Who coined the term 'protoplasm'?
Q 28.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 29.
Identify cell organelle and write down its name:
Powehouse of cell
Q 30.
Which organ of the plant body helps in osmoregulation?
Q 31.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 32.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 33.
Who is known as 'Father of Microscopy'?
Q 34.
Which cell organelle is called 'control center'?
Q 35.
Identify cell organelle and write down its name:
Membrane-bound vesicles arranged approximately parallel to each other. Active in synthesis, modification, sorting, and Secretion of cell products
Q 36.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 37.
In which year electron microscope was invented?
Q 38.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 39.
What is the thickness of cell membrane?
Q 40.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 41.
Name the longest cell in human body.
Q 42.
Define Passive Transport.
Q 43.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 44.
What is plasmolysis?
Q 45.
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 46.
Who is known as Father of Biology?
Q 47.
When chromosomes are visible in the nucleus?
Q 48.
Are Viruses Prokaryotic or Eukaryotic?
Q 49.
Name the cell organelles which their own DNA and Ribosomes.
Q 50.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
