Question:
Why are lysosomes known as suicide bags?
Answer:
Lysosomes are organelles that contain digestive enzymes. They digest excess or worn out organelles, food particles, and engulfed viruses or bacteria. Lysosomes fuse with vacuoles and dispense their enzymes into the vacuole, digesting its contents. Sometimes, lysosomes digest the cells that contain them. It happens when cells get damaged or destroyed. That's why lysosomes are called suicidal bags.
E.g. When a tadpole develops into a frog, lysosomes within the cells of the tadpole's tail cause its digestion. Or Lysosomes help in defense by digesting germs, as in white blood cells.
The Fundamental Unit of Life
Q 1.
Which cell organelle is known as 'protein factory'?
Q 2.
Is plasma membrane permeable or selectively permeable?
Q 3.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 4.
Which cell organelle is called 'kitchen of plant'?
Q 5.
What is the plasma membrane composed of?
Q 6.
Name the two postulates of the cell theory.
Q 7.
Are plastids present in all cells? What are its types?
Q 8.
What are chromosomes?
Q 9.
Why is mitochondria absent in red blood cells?
Q 10.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 11.
What is the full form of DNA and RNA?
Q 12.
Name the biggest cell in human body.
Q 13.
Name the sac like structure which form the grana?
Q 14.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 15.
Who observed the cells the first time?
Q 17.
Name the smallest cell in human body.
Q 18.
Who proposed the cell theory?
Q 19.
Give an example of anucleate cell i.e. cell without nucleus.
Q 20.
What are different types transport of components across cell membrane?
Q 21.
What are the conditions for osmosis?
Q 22.
What are the function of nucleus?
Q 23.
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 24.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 25.
Who coined the term 'protoplasm'?
Q 26.
What is plasmolysis?
Q 27.
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 29.
Will the temperature have any effect on the process of the osmosis?
Q 30.
Which organ of the plant body helps in osmoregulation?
Q 31.
Which cell organelle is called 'control center'?
Q 32.
Identify cell organelle and write down its name:
Powehouse of cell
Q 33.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 34.
In which year electron microscope was invented?
Q 35.
Who discovered Golgi apparatus?
Q 36.
When chromosomes are visible in the nucleus?
Q 37.
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 38.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 39.
What is the function of nucleoplasm?
Q 40.
Give an example of cells containing two nuclei (Binucleate).
Q 41.
Who is known as 'Father of Microscopy'?
Q 42.
What are the components nucleus?
Q 43.
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 44.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 45.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 46.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
Q 47.
Name the longest cell in human body.
Q 48.
What would happen if the plasma membrane ruptures or breaks down?
Q 49.
Which cell organelle is called 'transport system'?
Q 50.
Who discovered Virus?
