Question:
Name the longest cell in human body.
Answer:
Human nerve cell about 1 meter long.
The Fundamental Unit of Life
Q 1.
What are chromosomes?
Q 2.
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?
Q 3.
Name the biggest cell in human body.
Q 5.
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 6.
Are plastids present in all cells? What are its types?
Q 7.
What are the functions of Endoplasmic Reticulum (ER)?
Q 8.
What would happen if the plasma membrane ruptures or breaks down?
Q 9.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 10.
Are there any exceptions to cell theory proposed by Schleiden & Schwann and Virchow? If yes, what are those?
Q 11.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 12.
Give an example of cells containing two nuclei (Binucleate).
Q 13.
What is plasmolysis?
Q 14.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 16.
Who discovered nucleus in the cell?
Q 17.
Why is mitochondria absent in red blood cells?
Q 18.
Who observed the cells the first time?
Q 19.
Name the smallest cell in human body.
Q 20.
Why are lysosomes known as suicide bags?
Q 21.
Who discovered Virus?
Q 22.
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 23.
Identify cell organelle and write down its name:
A fluid-filled space surrounded by a membrane. Generally contains salts and sugars in plants.
Q 24.
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 25.
Name the book in which Robert Hooke published his observations about cork cells.
Q 26.
Who discovered Golgi apparatus?
Q 27.
Which organelle of the cell in animals helps in osmregulation?
Q 28.
What are the components nucleus?
Q 29.
What is the thickness of cell membrane?
Q 30.
Identify cell organelle and write down its name:
Appear brown dots either present freely in cell or bound to a membrane and make proteins.
Q 31.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 32.
Define Passive Transport.
Q 33.
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 34.
Name the sac like structure which form the grana?
Q 35.
Which organ of the plant body helps in osmoregulation?
Q 36.
Who is known as 'Father of Microscopy'?
Q 37.
What is Endoplasmic Reticulum(ER)? Name its types?
Q 38.
What is the function of nucleoplasm?
Q 39.
Why do we stain cells while observing under microscope? List commonly used stains.
Q 40.
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 41.
Name the world's smallest cell.
Q 42.
Give an example of anucleate cell i.e. cell without nucleus.
Q 43.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 44.
What is the plasma membrane composed of?
Q 45.
Is plasma membrane permeable or selectively permeable?
Q 46.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 47.
When chromosomes are visible in the nucleus?
Q 48.
What are centrosomes? What functions do they perform?
Q 49.
Are Viruses Prokaryotic or Eukaryotic?
Q 50.
Which cell organelle is called 'kitchen of plant'?