Fundamental Unit Of Life Class 9 Science Worksheet Pdf
Class 9 Science students should refer to the following printable worksheet in Pdf for Fundamental Unit Of Life in standard 9. This test paper with questions and answers for Grade 9 Science will be very useful for exams and help you to score good marks
Class 9 Science Worksheet for Fundamental Unit Of Life
ONE MARK QUESTIONS
1.Name the cell without membrane bound nucleus.
2.What are membrane bound structures in a cell called?
3.Name the functional segment of DNA that carries genetic information.
4.Where are proteins synthesized inside the cell?
5.Mitochondria is called the power house of the cell. Give reason.
TWO MARKS QUESTIONS
6.What is Chromatin material and how does it change just before the cell division?
7.Nucleus is called the director of the cell. Justify the statement giving reasons.
8.Give four differences between prokaryotic and eukaryotic cells.
9.State the types and functions of endoplasmic reticulum.
10.What would happen to the life of a cell in the absence of golgi apparatus?
THREE MARKS QUESTIONS
11.Why is plasma membrane called selectively permeable membrane? How do substances like CO2 and water move in and out of the cell?
12.Explain hypotonic, isotonic and hypertonic solution.
13. Photoautotrophic bacteria lack chloroplast. Name the part of the bacterial cell which performs photosynthesis? Plants have large sized vacuole. Why?
14. Why are lysosomes known as scavengers of the cells? Give two functions of centrosome.
15.Give three similarities and one difference between mitochondria and plastid. Expand ATP. FIVE MARKS QUESTIONS
16. You took a fresh tomato and put it in a highly concentrated salt solution for 2 hrs. Your little brother looked at it and stated “The fat tomato is so thin now” What a magic?
a) Define the phenomenon which has taken place.
b) How does a cell wall help a plant to withstand hypotonic external media without bursting?
17. Draw the diagram of an animal cell as seen through an electron microscope. Label the parts that carry out the functions: -Respiration, Secretion, Protein synthesis, Transport of material.Write the contribution of
a) Robert Hooke, b) Leeuwenhoek c) Robert Brown.
18. A cell is called the structural and functional unit of life. Explain. What is the meaning of division of labour? Is it different from cell to cell?
19. Draw the nucleus of a cell and label the:
a) Double layered structure which encloses the nucleus.
b) Visible entangled mass of thread like structures.
c) A darkly stained round structure inside the nucleus.
ii) Name the two components of Chromosomes. Mention the role of nuclear pore.
iii) What does DNA molecule contain?
iv) Give one difference between cytoplasm and nucleoplasm.
1.List two statements by which lysosomes are aptly called the suicide bags of the cell. What kind of enzymes are present in lysosomes?
2. In what two ways osmosis is different from diffusion.
3. List the constituents of plasma membrane. ___________________________________________
4. What is the advantage of having deeply folded membrane in mitochondria? __________________________
5. a) Write two differences between nuclear region of a bacterial cell and nuclear region of an animal cell.
b) Which structure present in the nuclear region of a living cell bear genes?
6. a) Differentiate between chromoplasts and leucoplasts.
b) Which kind of plastid is more common in:
i) Roots of the plants _____________________________________
ii) Leaves of the plants ___________________________________
iii) Flowers and fruits ___________________________________
7. What will happen when:
a) Dry apricots are left for sometime in pure water and later transferred to sugar solution?
b) A red blood cell is kept in concentrated saline solution.
c) Rheo leaves are boiled in water first and then is placed in the sugar syrup.
8. Look at the figure:
a) Name the process. _____________________________
b) Identify the organism shown in the figure. _____________________________________
c) It shows the nature of cell membrane as : (rigid/flexible). Explain the role of cell membrane undergoing this process.
9. Define membrane biogenesis. State the function of SER in liver cells of vertebrates. Relate the role of GB and RER with Lysosomes.
Exam Questions NCERT Class 9 Science Chapter 5 The Fundamental Unit of Life
Question. Where are genes located in the cell?
Ans : Genes are located in the chromosomes in the nucleus of the cell.
Question. Why does mitochondria have largely folded inner membrane?
Ans : Mitochondria have largely folded inner membrane which provides the increased surface area for ATPgenerating chemical reactions. Mitochondria is the site for cellular respiration and provides energy to the cell.
Question. Name the autonomous organelles in the cell.
Ans : Chloroplast and mitochondria are the autonomous organelles in the cells.
Question. What is the energy currency of the cell?
Ans : ATP—Adenosine Triphosphate.
Question. Name the cell organelle that helps in packaging?
Ans : Golgi apparatus.
Question. What is cell wall?
Ans : Cell wall is the rigid outer covering of plasma membrane in plant cells.
Question. What would happen if the plasma membrane breaks down?
Ans : If plasma membrane breaks down then molecules of some substances will freely move in and out.
Question. Where are proteins synthesized inside the cell?
Ans : The proteins are synthesised in the ribosomes, known as protein factories too.
Question. Who discovered cells in living organisms? Give an example of unicellular organism.
Ans : Leeuwenhoek (1674) was the first to observe the free living cells in pond water. Example of unicellular organisms : Amoeba, Chlamydomonas, Paramoecium, Bacteria, etc.
Question. What is the function of plastids?
Ans : Plastids are present only in plant cells. There are two types of plastids chromoplasts (coloured plastids) and leucoplasts (white or colourless). Chromoplast : Consists of coloured pigments andgiven different colours to flowers, fruits and leaves. The green colour pigment present in leaf is called chlorophyll which helps in the photosynthesis and a plastid with chlorophyll is called chloroplast. Leucoplast : It stores starch, oil and protein granules in it.
Question. Where do lipids and proteins get synthesized?
Ans : Lipids get synthesized in the smooth endoplasmic reticulum and proteins get synthesised in the ribosome and rough endoplasmic reticulum.
Question. Write a function of cell membrane.
Ans : Its major function is to hold cellular contents and control passage of materials in and out of the cell.
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