Question:
Place a de-shelled egg in water for five minutes. What do you observe? (Note: De-shelled egg means,the shell of an egg is removed by dissolving it in dilute hydrochloric acid. The shell is mostly calcium carbonate. A thin outer skin now encloses the egg.)
Answer:
The egg swells because water passes into it by osmosis. (hypotonic solution).
The Fundamental Unit of Life
Q 1.
Name the sac like structure which form the grana?
Q 2.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 3.
What is the full form of DNA and RNA?
Q 4.
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 5.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 6.
Identify cell organelle and write down its name:
Powehouse of cell
Q 7.
Identify cell organelle and write down its name:
Membrane-bound vesicles arranged approximately parallel to each other. Active in synthesis, modification, sorting, and Secretion of cell products
Q 9.
Who discovered Golgi apparatus?
Q 10.
What are the function of nucleus?
Q 11.
Identify cell organelle and write down its name:
A tough, non-living layer, it prevents plant cells from bursting, freely permeable
Q 12.
What is the energy currency of the cell called?
Q 13.
Which organelle of the cell in animals helps in osmregulation?
Q 14.
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 15.
Who discovered nucleus in the cell?
Q 17.
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 18.
Are plastids present in all cells? What are its types?
Q 19.
What are the components nucleus?
Q 20.
What is the function of nucleoplasm?
Q 21.
Name the cell organelles involved in synthesis, packaging and movement of protein (or other macromolecules) inside a cell.
Q 23.
In which year electron microscope was invented?
Q 24.
Define Passive Transport.
Q 25.
What are the conditions for osmosis?
Q 26.
Which cell organelle is called 'kitchen of plant'?
Q 27.
What are chromosomes?
Q 28.
Who discovered Virus?
Q 29.
Why is mitochondria absent in red blood cells?
Q 30.
Identify cell organelle and write down its name:
Detoxify drugs and poisons specially in liver cells.
Q 31.
Is plasma membrane permeable or selectively permeable?
Q 32.
What would happen if the plasma membrane ruptures or breaks down?
Q 33.
Who is known as Father of Biology?
Q 34.
What is osmoregulation?
Q 35.
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 36.
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 37.
Identify cell organelle and write down its name:
A structure involved in production of ribosomes, present inside a nucleus.
Q 38.
Name the book in which Robert Hooke published his observations about cork cells.
Q 39.
Name the two postulates of the cell theory.
Q 40.
Name the smallest cell in human body.
Q 41.
Name the longest cell in human body.
Q 42.
Give an example of anucleate cell i.e. cell without nucleus.
Q 43.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 44.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 45.
What is plasmolysis?
Q 46.
What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?
Q 47.
Why are lysosomes known as suicide bags?
Q 48.
Will the temperature have any effect on the process of the osmosis?
Q 49.
Who is known as 'Father of Microscopy'?
Q 50.
Which cell organelle is called 'control center'?
