Class 9 Exam > Class 9 Notes > Science Class 9 > Unit Test: The Fundamental Unit of Life
Unit Test: The Fundamental Unit of Life | Science Class 9 PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each.
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question number 12 & 13 carry 5 marks each
Q1: Which of the following cellular structures contains its own DNA and is thought to be an ancient prokaryote symbiotically living in eukaryotic cells? (1 Mark)
(i) Lysosome
(ii) Mitochondria
(iii) Golgi apparatus
(iv) Endoplasmic reticulum
Q2: Fill in the blank: The semi-fluid substance inside the cell, which contains organelles and the cytoskeleton, is known as "________."
(1 Mark)
Q3: Who discovered the cell while examining a thin slice of cork?
(i) Anton van Leeuwenhoek
(ii) Robert Hooke
(iii) Matthias Schleiden
(iv) Theodor Schwann
Q4: True or False: The endoplasmic reticulum is responsible for the synthesis of ribosomes in eukaryotic cells.(1 Mark)
Q5: Which of the following organelles plays a key role in modifying, sorting, and packaging proteins for secretion or delivery to other organelles?(1 Mark)
(i) Nucleus
(ii) Mitochondria
(iii) Golgi apparatus
(iv) Ribosomes
Q6: Describe the function of the plasma membrane in a cell. (2 Marks)
Q7: Differentiate between prokaryotic and eukaryotic cells in terms of their nuclear region. (2 Marks)
Q8: What would happen to an animal cell if placed in a hypotonic solution? (2 Marks)
Q9: Explain the role of mitochondria in a cell. (3 Marks)
Q10: Describe the process of osmosis and its importance in the cell. (3 Marks)
Q11: Discuss the structure and function of the nucleus in a eukaryotic cell. (3 Marks)
Q12: Compare and contrast plant cells and animal cells based on their structure and organelles. (5 Marks)
Q13: Explain the process of cell division and its importance in growth and reproduction. (5 Marks)
You can find the solutions of this Unit Test here: Unit Test (Solution): The Fundamental Unit of Life
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FAQs on Unit Test: The Fundamental Unit of Life - Science Class 9
| 1. What is the basic structure of a cell? |  |
Ans. The basic structure of a cell includes the cell membrane, cytoplasm, and organelles. The cell membrane is a protective barrier that regulates what enters and exits the cell. The cytoplasm is a gel-like substance where organelles are suspended, and organelles such as the nucleus, mitochondria, and ribosomes carry out specific functions essential for cell life.
| 2. What is the difference between prokaryotic and eukaryotic cells? | |
Ans. Prokaryotic cells are simpler and smaller, lacking a nucleus and membrane-bound organelles. They are typically unicellular organisms, like bacteria. Eukaryotic cells, on the other hand, are larger and more complex, containing a nucleus that houses DNA and various membrane-bound organelles. Eukaryotic cells can be unicellular or multicellular, such as plants, animals, and fungi.
| 3. What are the functions of the cell membrane? | |
Ans. The cell membrane serves several key functions: it acts as a barrier that protects the cell from its environment, regulates the movement of substances in and out of the cell (selective permeability), facilitates cell communication through receptor proteins, and provides structural support to maintain the shape of the cell.
| 4. Why are mitochondria known as the "powerhouses" of the cell? | |
Ans. Mitochondria are known as the "powerhouses" of the cell because they are responsible for producing ATP (adenosine triphosphate), which is the primary energy currency of the cell. Through cellular respiration, mitochondria convert nutrients into energy, fueling various cellular processes and activities.
| 5. What role do ribosomes play in the cell? | |
Ans. Ribosomes play a crucial role in protein synthesis. They are the sites where messenger RNA (mRNA) is translated into proteins by linking amino acids together in the order specified by the mRNA sequence. Ribosomes can be found floating freely in the cytoplasm or attached to the endoplasmic reticulum, contributing to different types of protein production.
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