Question:
What is plasmolysis?
Answer:
When a living plant cell loses water placed in hypertonic solution, the plant cell shrinks away from the cell wall. This process is called plasmolysis.Plants with plasmolysed cells wilt.
The Fundamental Unit of Life
Q 1.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 2.
Name the biggest cell in human body.
Q 3.
What are chromosomes?
Q 4.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 5.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 6.
What are the components nucleus?
Q 7.
Name the cell organelles which their own DNA and Ribosomes.
Q 8.
What is osmoregulation?
Q 9.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 10.
What is the full form of DNA and RNA?
Q 11.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 12.
When chromosomes are visible in the nucleus?
Q 14.
Who discovered Virus?
Q 15.
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 17.
Who is known as Father of Biology?
Q 18.
What are centrosomes? What functions do they perform?
Q 19.
What is the function of nucleoplasm?
Q 20.
Identify cell organelle and write down its name:
Powehouse of cell
Q 21.
Who coined the term 'protoplasm'?
Q 22.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 23.
Name the smallest cell in human body.
Q 24.
Why is mitochondria absent in red blood cells?
Q 25.
What is cytoskeleton?
Q 26.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 27.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 28.
Name the longest cell in human body.
Q 29.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 30.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 31.
Which cell organelle is known as 'protein factory'?
Q 32.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 33.
Will the temperature have any effect on the process of the osmosis?
Q 34.
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 35.
In which year electron microscope was invented?
Q 36.
Is plasma membrane permeable or selectively permeable?
Q 37.
What are different types transport of components across cell membrane?
Q 38.
Define Passive Transport.
Q 39.
Why are lysosomes known as suicide bags?
Q 40.
Which organelle of the cell in animals helps in osmregulation?
Q 41.
What are the function of nucleus?
Q 42.
Name the cell organelles which change energy from one form to another.
Q 43.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 44.
Identify cell organelle and write down its name:
Thread like structures made up of in DNA and proteins. Converts to chromosomes when cell is dividing.
Q 45.
Name the two postulates of the cell theory.
Q 46.
What is the energy currency of the cell called?
Q 47.
What are the conditions for osmosis?
Q 48.
Are Viruses Prokaryotic or Eukaryotic?
Q 49.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
Q 50.
Identify cell organelle and write down its name:
Appear brown dots either present freely in cell or bound to a membrane and make proteins.
