Case study Questions in Class 9 Science Chapter 5 are very important to solve for your exam. Class 9 Science Chapter 5 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving Class 9 Science Case Study Questions Chapter 5 The Fundamental Unit of Life

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

The Fundamental Unit of Life Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 5 The Fundamental Unit of Life

Case Study/Passage-Based Questions

Case Study 1: The cell theory, that all plants and animals are composed of cells and that the cell is the basic unit of life, was presented by two biologists, German zoologist Schleiden (1838) and British zoologist Schwann (1839). The cell theory was further expanded by Virchow (1855) by suggesting that all cells arise from pre-existing cells. With the discovery of the electron microscope in 1940, it was possible to observe and understand the complex structure of the cell and its various organelles.

(1) Theodore Schwann was a _____

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(2) Matthias Schleiden was a _____

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(3) Which of these scientists formulated the cell theory?

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(4) Which scientist was the first to explain that new cells arise from pre-existing cells?

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(5) Which of these scientists did not contribute to the cell theory?

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Case Study 2: Study the given diagram of the bacterial cells and answer any four questions from (i) to (v).

(i) Label the parts marked 1, 2, and 3.
(a) 1- Nucleus, 2-Cell wall, 3- Plasma membrane.
(b) 1-Cell wall, 2- Nucleoid, 3- Plasma membrane.
(c) 1- Cytoplasm,2- Nucleus, 3- Cell wall.
(d) 1- Nucleus, 2-Cytoplasm, 3- Cell wall.

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(ii) Which structure is present in region 2 of a living cell bear genes?
(a) Chromosome
(b) Plasma membrane
(c) Cytoplasm
(d) Cell wall

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(iii) How nuclear region of a bacterial cell and the nuclear region of an animal cell is different from each other?
(a) Nuclear region of bacterial cell is well defined but lacks any covering while nuclear region of an animal cell is poorly defined and membrane bound.
(b) Nuclear region of bacterial cell is poorly defined and has a covering while nuclear region of an animal cell is poorly defined and membrane bound.
(c) Nuclear region of bacterial cell is poorly defined and lacks any covering while nuclear region of an animal cell is well defined and membrane bound.
(d) Nuclear region of bacterial cell is poorly defined and lack any covering while nuclear region of an animal cell is well defined and membrane bound.

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(iv) Which of the following statement is correct?
(a) A single cell cannot perform all the life processes independently.
(b) A single cell can perform all the life processes independently.

(c) A single bacterial cell always needs another cell to carry out the life processes.
(d) A bacterium is a multicellular organism.

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(v) An example of single-celled organism is :
(a) Bird
(b) Fish
(c) Snake
(d) Amoeba

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Case Study 3:

The fundamental unit of life is the cell. All living organisms are composed of cells, which are the smallest structural and functional units of life. Cells vary in size, shape, and organization in different organisms. They can be classified into two broad categories: prokaryotic cells and eukaryotic cells. Prokaryotic cells are simple and lack a well-defined nucleus, while eukaryotic cells are more complex and contain a true nucleus surrounded by a nuclear membrane. Within a cell, various organelles perform specific functions. For instance, the nucleus controls the cell’s activities and contains genetic material, while the cytoplasm houses organelles and provides a site for cellular processes. Understanding the structure and functions of cells is crucial to comprehend the complexity of living organisms and their ability to carry out essential life processes.

What is the fundamental unit of life?
a) Atom
b) Molecule
c) Cell
d) Tissue
Answer: c) Cell

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What are cells?
a) Structural units of life
b) Building blocks of matter
c) Functional units of life
d) All of the above
Answer: d) All of the above

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How do prokaryotic cells differ from eukaryotic cells?
a) Prokaryotic cells have a true nucleus, while eukaryotic cells lack a nucleus.
b) Prokaryotic cells are more complex than eukaryotic cells.
c) Prokaryotic cells lack a well-defined nucleus, while eukaryotic cells have a true nucleus.
d) Prokaryotic cells are larger in size than eukaryotic cells.
Answer: c) Prokaryotic cells lack a well-defined nucleus, while eukaryotic cells have a true nucleus.

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Which organelle controls the cell’s activities and contains genetic material?
a) Nucleus
b) Cytoplasm
c) Cell membrane
d) Mitochondria
Answer: a) Nucleus

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Why is understanding the structure and functions of cells important?
a) To comprehend the complexity of living organisms
b) To determine the size and shape of cells
c) To classify cells into prokaryotic and eukaryotic
d) To study the chemical composition of cells
Answer: a) To comprehend the complexity of living organisms

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