The Fundamental Unit Of Life Class 9 Biology Worksheet Pdf
Class 9 Biology students should refer to the following printable worksheet in Pdf for The Fundamental Unit Of Life in standard 9. This test paper with questions and answers for Grade 9 Biology will be very useful for exams and help you to score good marks
Class 9 Biology Worksheet for The Fundamental Unit Of Life
CBSE Class 9 Biology Worksheet - The Fundamental Unit Of Life
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CLASS: IX SA 1 PORTION LESSON: 5 THE FUNDAMENTAL UNIT OF LIFE
Answer the following questions:
1. Who discovered the cell?
2. What is cork?
3. Name the smallest and largest known cell.
4. Who discovered the nucleus of a cell?
5. What is the ‘Power house” of a cell and why it is called so?
6. Name the longest cell of human body.
7. Which cell organelle is known as suicidal bags?
8. What does ATP stands for?
9. Where are the genes located?
10. Define osmosis and exosomosis
11. What is a nucleoid?
12. What is endocytosis?
13. Name the plastid which stores starch, oil and protein granules.
14. What is DNA? Where is it found?
15. Name the processes by which CO2 and water moves in and out of the cells.
16. What is membrance biogenesis?
17. What are chromoplast?
18. In what aspects, vacuoles in plant cells differ from those in the animal cells?
19. Name the three functional regions of the cell.
Exam Questions NCERT Class 9 Science Chapter 5 The Fundamental Unit of Life
Question. Who gave the cell theory? What does it state? Which organism is an exception of cell theory?
Ans : Two biologists; “Schleiden and Schwann” gave the “Cell theory” which expanded by “Rudolf Virchow”.Cell theory states that :
(i) All plants and animals are composed of cells.
(ii) Cell is the basic unit of life.
(iii) All cells arise from pre-existing cells. Viruses are the exceptions of cell theory.
Question. Do vacuoles store material? If so, name them.
Ans : Yes, vacuoles store some important substances required in life of the plant cell. These are amino acids, sugars, various organic acids and also some proteins.
Example : Amoeba, vacuoles also store food.
Question. How do substances like CO2 and water move in and out of the cell?
Ans : The substances like CO2 move in and out of a cell by diffusion from the region of high concentration to low concentration. Water also obey the law of diffusion.
The movement of water molecule through such a selective permeable membrane is called osmosis.
Question. How does fungi and bacteria can withstand much greater changes in the surrounding medium than animal cells?
Ans : The cell wall present in fungi and bacteria permits these cells to resist very dilute external medium without bursting. Water is taken up by osmosis.
Hence, cells swell and build the pressure against the cell wall. The wall exerts an equal pressure against the swollen cell. It is because of the cell wall, such cells can resist much greater changes in the surrounding medium than animal cells.
Question. Give difference between diffusion and osmosis.
1. Diffusion can occur in any medium.
2. The diffusing molecules may be solids, liquids or gases.
3. Semipermeable membrane is not required.
4. An equilibrium in the free energy of diffusion molecules is achieved in the system.
1. It occurs only in liquid medium.
2. It involves movement of solvent molecules only.
3. Semipermeable membrane is required.
4. Equilibrium in the free energy of solvent molecules is never achieved.
Question. What are the function of endoplasmic reticulum and lysosome.
(a) Functions of endoplasmic reticulum :
(i) It forms supporting skeletal framework of the cell.
(ii) ER provides a pathway for the distribution of nuclear material from one cell to the other.
(b) Functions of lysosomes :
(i) Lysosomes serve as intracellular digestive system. They destroy any foreign material which enters the cells such as bacteria and virus.
(ii) Lysosomes also remove the worn out and poorly working cellular organelles by digesting them to make way for their new replacements.
Question. Explain the functions of various cell organelles.
Ans : Functions of cell organelles :
(i) Endoplasmic Reticulum : It forms the supporting skeletal framework of the cell.
(ii) Ribosomes : It synthesises proteins.
(iii) Golgi Apparatus : It produces vacuoles which contain cellular secretion.
(iv) Lysosomes : It serves as intracellular digestive system as it digest the foreign materials which enter the cell.
(v) Mitochondria : These are the sites of cellular respirations.
(vi) Plastids : These are present only in plants and trap solar energy to manufacture food for plants.
(vii) Vacuoles : They help to maintain the osmotic pressure in a cell.
(viii) Peroxisomes : They carry-out some oxidative reactions.
(ix) Centrosome : It helps in cell division in the animal cell.
Question. Which cell organelle is known as the ‘suicidal bags’ of a cell? Why?
Ans : Lysosomes are known as suicidal bag of cell. During the disturbance in cellular metabolism, lysosome may burst and the enzymes digest their own cell. Hence, lysosome are called ‘suicide bags’ of a cell.
Question. What is nucleoid?
Ans : The nuclear region in some cells are poorly defined due to the absence of a nuclear membrane, it contains only nucleic acid. This undefined nuclear region with nucleic acid in it is called nucleoid.
Question. (i) Name the largest animal cell.
(ii) Name the smallest cell.
Ans : (i) An ostrich egg.
(ii) Pleuro pneumonia bacterium.
Question. What is osmosis?
Ans : The movement of water molecules through a selectively permeable membrane is called osmosis. This takes place from higher water concentration to lower water concentration.
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