Question:
What are the function of nucleus?
Answer:
- Nucleus controls all the cellular activities of the cell.
- Nucleolus is involved in synthesis of ribosomes.
- Nucleus contains hereditary information of cell.
- It is responsible for cell division (reproduction) and transmission of genetic information from parents to offspring.
Surface Area to Volume Ratio
Surface Area of a cube (SA) = (length x Width) x 6 Faces Volume of cube (V) = length x length length Surface Area to Volume Ratio = SA/V SA/V ratio of cube of 1 cm length = 6:1 SA/V ratio of cube of 2 cm length = 24/8 = 3:1 SA/V ratio of cube of 4 cm length = 96/64 = 1.5: 1 ⇒ SA/V ratio decreases as the sizes of the cube increases
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.
When chromosomes are visible in the nucleus?
Q 10.
Name the cell type that have internal membranes which compartmentalize their functions.
Q 11.
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 12.
What is the full form of DNA and RNA?
Q 13.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 16.
Who discovered Virus?
Q 17.
Identify cell organelle and write down its name:
Powehouse of cell
Q 18.
Who is known as Father of Biology?
Q 19.
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 20.
Who coined the term 'protoplasm'?
Q 21.
Name the longest cell in human body.
Q 22.
Which organelle of the cell in animals helps in osmregulation?
Q 23.
What are centrosomes? What functions do they perform?
Q 24.
What is the function of nucleoplasm?
Q 25.
Why is mitochondria absent in red blood cells?
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:
Called 'suicide bags' of a cell.
Q 28.
What are the function of nucleus?
Q 29.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 30.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 31.
Name the two postulates of the cell theory.
Q 32.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 33.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 34.
What is cytoskeleton?
Q 35.
Name the cell organelles which change energy from one form to another.
Q 36.
Identify cell organelle and write down its name:
Jelly like substance containing particles and other organelles. What is it?
Q 37.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 38.
Name the smallest cell in human body.
Q 39.
Which cell organelle is known as 'protein factory'?
Q 40.
Which organ of the plant body helps in osmoregulation?
Q 41.
Are Viruses Prokaryotic or Eukaryotic?
Q 42.
Which cell organelle is called 'transport system'?
Q 43.
Who proposed the cell theory?
Q 44.
Is plasma membrane permeable or selectively permeable?
Q 45.
Define Passive Transport.
Q 46.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 47.
What do you mean by Endocytosis? How does an Amoeba obtain its food?
Q 48.
Will the temperature have any effect on the process of the osmosis?
Q 49.
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 50.
Name the largest cell?
