B. Short Answer Type Questions (2 marks)
1. What is main significance of cell wall?
2. Distinguish between plasma membrane and cell wall.
3. What are chromosomes? State their function briefly.
4. Differentiate between RER and SER.
5. State two differences between plant cell and animal cell.
6. State how the lysosomes help to keep the cell clean.
Answers
Answer:
3) a chromosomes are rod shape structure present in nucluis of the cell,which is about to divide.
- chromosome contains informations of inheritance of character from parents to next generation.
- chromosome are composed of DNA and protiens.
Answer:
1]•It provide definite shape to the plant cell
•It gives rigidity to the plant
2]1.Cell Membrane
• Being selectively permeable,it permit only certain substances to pass through
• It bound the semi fluid content of the cell
2. Cell wall
• It provide definite shape to the plant cell
• It provide rigidity to the plant cell
3] During cell division chromatin fibres condense to form thick ribbon like structure called chromosome
It contains hereditary unit the genes
4]1,RER
• RER is attached to the walls of ribosomes
•It helps in the synthesis of protein
2,SER
• It is not attached to the ribosomes
• It help in lipid synthesis
5]1, Plant Cell
• It has cell wall
• It has plastids
2,Animal Cell
•It has no cell wall
•It has no plastids
6] Lysosomes are membrane bound sacs filled with digestive enzymes , these make the cell clean . It is a a called the suicidal bag of the cell as it burst during the cell gets damage,and the enzymes can digest the cell that damage it