Question:
What are chromosomes?
Answer:
Chromosomes are compact rod like bodies, which are formed at the time of cell division from chromatin material. They are made up of DNA and carry genes (unit of inheritance).
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.
Which cell organelle is called 'kitchen of plant'?
Q 4.
What is the plasma membrane composed of?
Q 5.
Is plasma membrane permeable or selectively permeable?
Q 6.
Are plastids present in all cells? What are its types?
Q 7.
What is the full form of DNA and RNA?
Q 8.
Which of the following cell is better candidate to study lysosomes?
(a) White Blood Cell
(b) Muscle Cell
Q 9.
What are chromosomes?
Q 11.
Name the two postulates of the cell theory.
Q 12.
Name the biggest cell in human body.
Q 13.
What are different types transport of components across cell membrane?
Q 14.
Name the sac like structure which form the grana?
Q 15.
Why is mitochondria absent in red blood cells?
Q 16.
Who observed the cells the first time?
Q 17.
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 18.
Give an example of anucleate cell i.e. cell without nucleus.
Q 19.
Which organ of the plant body helps in osmoregulation?
Q 20.
What are the function of nucleus?
Q 21.
Who coined the term 'protoplasm'?
Q 22.
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 23.
Identify cell organelle and write down its name:
Digestive organelle where macromolecules are hydrolyzed
Q 24.
Who proposed the cell theory?
Q 25.
Name the smallest cell in human body.
Q 26.
Will the temperature have any effect on the process of the osmosis?
Q 28.
What are the conditions for osmosis?
Q 29.
Identify cell organelle and write down its name:
Powehouse of cell
Q 30.
Who proposed fluid-mosaic model of cell or plasma membrane?
Q 31.
What is plasmolysis?
Q 32.
When chromosomes are visible in the nucleus?
Q 33.
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 34.
Which cell organelle is called 'control center'?
Q 35.
Which cell organelle is called 'transport system'?
Q 36.
Identify cell organelle and write down its name:
Contains green colour pigment, traps light energy. Present in some plant cells.
Q 37.
In which year electron microscope was invented?
Q 38.
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 39.
Identify cell organelle and write down its name:
Called 'suicide bags' of a cell.
Q 40.
Who is known as 'Father of Microscopy'?
Q 41.
What is the thickness of cell membrane?
Q 42.
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 43.
Who expanded cell theory by suggesting that all cells arise from pre-existing cells?
Q 44.
Name the longest cell in human body.
Q 45.
Give an example of cells containing two nuclei (Binucleate).
Q 46.
Give examples of cells which are muti-nucleate (i.e. having many nuclei).
Q 47.
Define Osmosis. What are different types of osmosis? Give examples of osmosis.
Q 48.
Who discovered Golgi apparatus?
Q 49.
What is Endoplasmic Reticulum(ER)? Name its types?
Q 50.
What is the function of nucleoplasm?
