plz give notes of chapter fundamental unit of life class 9
You can answer either in text or in Pic from notebook
Answers
Answer:
Q1. Who discovered cell and how?
Ans: Robert Hooke, in 1665 discovered cell in thin slices of cork under the microscope. He observed that cork resembles the structure of honeycomb consisting of many compartments and that are called cells.
Q2. Why cell is called structural and functional unit of life?
Ans: Cells are arranged in proper systematic order to form a living organism thus we say cell serves as a building block for organisms. Cells are also called functional unit because all the metabolic activities of life takes place at the cell level.
Q3. How do substances like carbon dioxide and water move in and out from the cell?
Ans: They move in or out of the cell by the process of diffusion. There is spontaneous movement of substances from higher concentration to lower concentration. When this movement involves use of semi permeable membrane then it is called osmosis.
Q4. Difference between prokaryotic and eukaryotic cell?
Prokaryotic cell
Eukaryotic cell
Small in size
Large in size
N. material lies naked in cytoplasm
N. material is surrounded by n. membrane
Nucleolus present
Organelles absent
Organelles presents
Contain single chromosome
Example: bacteria ,blue green algae, etc
Contain more than one chromosome
Example: Man etc.
Q5. How Amoeba obtains its food?
Ans: Amoeba obtains its food by pseudopodia.
The plasma membrane of amoeba is flexible and enables the cell to engulf the food and form a cup shaped structure called pseudopodia by the process of endocytosis.
Q6. Differentiate between plant cells and animal cells ?
Plant cell
Animal cell
1. It has a cell wall made up of cellulose
1. It doesn’t have cell wall
2. It has plastids
2. It lack plastids
3. The vacuole is of large size
3. The vacuole is either absent and if present then it is of small size
4. Centrosome absent
4. Centrosome present
5. The food is stored in the form of starch and glycogen
5. The food is stored in the form of glycogen
Q7. Can you name two organelles that have their own genetic material?
Ans: Chloroplast and Mitochondria
Q8. If the organization of cell is destroyed due to some physical or chemical influence, what would happen?
Ans: If the organization of cell is destroyed due to some physical or chemical influence, Cell will die.
Q9. Why are lysosomes called suicidal bags?
Ans: Lysosomes are called suicidal bags because they can eat up their own cell if in case it gets damaged.
Q10. Where protein synthesis occurs in the cell?
Ans: Protein synthesis occurs in Ribosome.
Q11. What would happen if cell doesn’t have Golgi bodies?
Ans: The Golgi body helps in secretion, packaging and dispatching of cellular secretion.If it is not present then his will not occur.
Q12. Which organelle is called as power house of cell and why?
Ans: Mitochondria is called so because in it oxidation of food occurs and it produces energy in the form of ATP.
Q13. Where do lipids and proteins constituting the cell membrane get synthesized?
Ans: Proteins are made by ribosome and lipids by SER.
Q14. What is osmosis?
Ans: It is the movement of water from higher concentration to lower concentration across the semipermeable membrane.
Q15. Carry out the following experiment:
Take four peeled potato halves and hollow each one out to make potato cups .One of these cups should be made from a boiled potato .Put each potato cup in a trough containing water .Now,
Keep cup A empty
Put one teaspoon sugar in cup B
Put one teaspoon salt in cup C
Put one teaspoon sugar in boiled potato cup D
Keep the set up for 2 hours and observe four potato cups and answer:
Explain why water gathers in the hollowed portion of B and C.
Why is the potato a necessary for this experiment?
Explain why water doesn’t gather in hollowed portions of potato A and D.
The water gathers in hollowed portion of potato cups B and C due to osmosis.
Cup A acts as control experiment and indicates that cavity of potato will not induce any type of movement.
Cup A does not contain hypertonic solution hence water does not rise .In cup D, cells of potato cup being boiled cells are dead and no osmosis occurs.
PLS MARK AS BRAINIEST!!!
Answer:
some important points and question answers are here
