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Class 9 Exam  >  Class 9 Tests  >  Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Class 9 MCQ

Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Class 9 MCQ


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10 Questions MCQ Test - Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1

Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 for Class 9 2024 is part of Class 9 preparation. The Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 below.
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Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 1
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Not all cells of human body look alike in terms of structure.

Reason : Structure of cell is determined by the function it performs.

Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 1
No, not all cells in our body look alike in terms of shape, size and structure. The shape, size and structure of cell are determined by the function which it performs.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 2
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Plant cells have very large vacuoles.

Reason : In plant cells, vacuoles are full of cell sap

Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 2
Plant cells possess large vacuoles to perform functions

like:

  1. Storage of water, mineral etc.

  2. Provide turgidity and rigidity to the cell, as it is filled with cell sap.

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Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 3
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Multicellular organism have higher survival rate than unicellular organisms.

Reason : In Multicellular organism, dead cells are replaced by new cells.

Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 3
Multicellular organisms are made of many cells. Death or injury of any cells can be replaced by new cells. Thus, because of increased efficiency, organization and division of labour, multicellular organisms have higher survival rate.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 4
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Mitochondria are called ‘powerhouses’ of the cell.

Reason : Mitochondria produce cellular energy in the form of ATP
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 4
Mitochondria are cell organelles of aerobic eukaryotes. These are site of aerobic respiration, where Krebs cycle occurs in matrix, while ETS and oxidative phosphorylation enzymes are located in inner membrane. They are called powerhouses of cell because they produce energy in the form of ATP. They are the major centres of release of energy in the aerobic respiration.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 5
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A single cell lives independently on its own.

Reason : Single cell can perform all the life processes.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 5
A single cell or unicellular organism like Amoeba and Paramecium can perform all the life processes and therefore can live independently on their own.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 6
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A plant cell bursts if placed in water.

Reason : High turgor pressure causes bursting of plant cells.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 6
Plant cells have cell wall to counteract turgor pressure (T.P.) by exerting exactly equal and opposite wall pressure. Wall pressure stops entry of water into plant cells beyond a certain limit thus prevents their bursting.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 7
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Cells are functional unit of life.

Reason : A single cell has the ability to form whole organism.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 7
Cells are functional unit of life because they can perform all the activities required to sustain life. New cells divide by division of pre-existing cells. A single cell has the ability to form whole organism.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 8
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A cell membrane shows fluid behaviour.

Reason : A membrane is a mosaic of lipids and proteins.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 8
A cell membrane shows fluid behaviour. It was proved by fluid- mosaic model of a biomembrane by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is a mosaic of the two. Further, the membrane is not solid but is quasi fluid.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 9
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Lysosomes are known as suicidal bag of cells.

Reason : Lysosomes contain powerful enzymes capable of breaking down all organic material.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 9
During the disturbance in cellular metabolism lysosomes may burst and the enzymes digest their own cell. Therefore, lysosomes are also known as suicidal bags. Lysosomes are able to do this because they contain powerful enzymes capable of breaking down all organic material.
Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 10
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Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Cell wall is a non-living part of the cell.

Reason : It offers protection, definite shape and support.
Detailed Solution for Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 1 - Question 10
Cell wall is a non-living part of the cell. It is an outer, rigid, protective, supportive and semi-transparent covering of plant cells only. The cell wall lies outside the plasma membrane. The cell wall is mainly composed of cellulose. It provides a definite shape to the cell. It protects plasma membrane and internal structures from the attack of pathogens and mechanical injury.
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