Why is the cell called the structural and functional unit of life?
class 9
Answers
Answer:
Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells
Explanation:
Who discovered cells and how? (page 59)
Answer- Cell was discovered by an English Botanist, Robert Hooke in 1665. He used self-designed microscope to observe cells in a cork slice back then.
2. Why the cell is called the structural and functional unit of life? (Page 59)
Answer- Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells.
1. How do substances like CO2 and water move in and out of the cell? Discuss. (page-61)
Answer- The substances like CO2and water move in and out of a cell through the process called diffusion from the region of concentrated region to low concentrated one. When the concentration of carbon di-oxide and water is higher in external environment than that inside the cell, CO2and water moves inside the cell. When the concentration outside the cell is low but it is high inside the cell, they move outwards.
2. Why the plasma membrane is called a selectively permeable membrane? (page 61)
Answer- Plasma membrane called a selectively permeable membrane because it regulates the movement of substances from within to outside of the cell. This means that the plasma membrane allows the entry of some substances while preventing the movement of some other substance.
1. Can you name the two organelles we have studied that contain their own genetic material? (page-65)
Answer- Mitochondria and plastids their own genetic material
2. If the organization of a cell is destroyed due to some physical or chemical influence, what will happen? (page 65)
Answer- If the organization of a cell is destroyed due to some physical or chemical influence then cell will not be able to perform its basic functions like digestion, excretion, respiration etc. This may stop all the life activities and the life of an individual may come to an end.
3. Why are lysosomes known as suicide bags? (page 65)
Answer- Lysosomes are called suicide bags because in case of any disturbance of their cellular metabolism they release their own enzymes to digest their own cell.
4. Where are proteins synthesized inside the cell? (page 65)
Answer- The proteins are synthesized in the Ribosome
Answer:
Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells.