Question:
What is diffusion?
Answer:
Diffusion is the net movement of molecules from high to regions of lower concentration as a result of random molecular motion. Diffusion tends to distribute molecules uniformly. Exchange of gases like CO2 and O2 in lungs, plants, blood cells, O2 entering stomata of leaves are examples of diffusion. Diffusion is passive transport i.e. no external energy is provided for the movement of molecules. The natural kinetic energy of the particle supplies the energy.
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.
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.
Why is mitochondria absent in red blood cells?
Q 9.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 10.
What are chromosomes?
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.
Who proposed the cell theory?
Q 18.
Name the smallest cell in human body.
Q 19.
Give an example of anucleate cell i.e. cell without nucleus.
Q 20.
What are the function of nucleus?
Q 21.
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 22.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 23.
What are different types transport of components across cell membrane?
Q 24.
What is plasmolysis?
Q 25.
What are the conditions for osmosis?
Q 26.
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 27.
Who coined the term 'protoplasm'?
Q 28.
Will the temperature have any effect on the process of the osmosis?
Q 29.
Which organ of the plant body helps in osmoregulation?
Q 30.
Which cell organelle is called 'control center'?
Q 31.
Identify cell organelle and write down its name:
Present in some animal cells, help in locomotion.
Q 32.
In which year electron microscope was invented?
Q 34.
Who discovered Golgi apparatus?
Q 35.
When chromosomes are visible in the nucleus?
Q 36.
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 37.
Identify cell organelle and write down its name:
Powehouse of cell
Q 38.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 39.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
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.
What is the function of nucleoplasm?
Q 44.
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 45.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
Q 46.
Name the longest cell in human body.
Q 47.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 48.
What would happen if the plasma membrane ruptures or breaks down?
Q 49.
Why are lysosomes known as suicide bags?
Q 50.
What is the energy currency of the cell called?
