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Class 9 Exam  >  Class 9 Tests  >  Science Olympiad Class 9  >  Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Class 9 MCQ

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Class 9 MCQ


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15 Questions MCQ Test Science Olympiad Class 9 - Olympiad Test: Cell - The Fundamental Unit of Life- 3

Olympiad Test: Cell - The Fundamental Unit of Life- 3 for Class 9 2024 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Cell - The Fundamental Unit of Life- 3 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Cell - The Fundamental Unit of Life- 3 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Cell - The Fundamental Unit of Life- 3 below.
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Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 1
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Plasmolysis in a plant cell is defined as

Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 1
Plasmolysis in a plant cell is defined as the process of shrinkage of the cytoplasm as a result of loss of water from the cell. It occurs when plant cells are placed in a solution that has a higher concentration of solutes than the cell does. In this, plant cell is kept in hypertonic solution. When cell is placed in hypotonic solution, cell is lysed.

Thus, the correct answer is option B.

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 2
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Unicellular organisms take in oxygen and pass out carbon dioxide through

Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 2
In unicellular organisms like Amoeba, gaseous exchange takes place through the process of diffusion.
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Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 3
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Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 3
Smooth endoplasmic reticulum is a part of endoplasmic reticulum which does not possess ribosomes studded on its membrane. It is involved in detoxification of many poisons and drugs such as drugs, aspirin, insecticides (DDT), petroleum products and pollutants and converting them to safer water soluble products.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 4
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Select odd one out

substances dissolved in it
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 4
Each cell is bounded by an extremely delicate, thin elastic living membrane, called the plasma membrane. The plasma membrane is made up of two layers of lipid (fat) molecules with protein molecules which is sandwitched between the lipid layer. The structure of plasma membrane can be observed under an electron microscope only. It is a selectively permeable membrane which allows the flow of only some substances into the cell and out of the cell. Viruses do not have any membranes.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 5
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Which of the following is covered by a single membrane?
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 5
The cell organelles covered by a single membrane is vacuole. The vacuole of a plant cell is conspicuous and centrally placed, with peripheral cytoplasm. The membrane enclosing the vacuole of a plant cell is called a tonoplast.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 6
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Photosynthetic pigments are located in
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 6
The chloroplast is a double membrane-bound structure that contains the photosynthetic pigment chlorophyll.

Inside the chloroplast, there is an interconnected membranous system known as the thylakoid membranes that encloses Photosynthetic pigments and protein-rich fluids known as stroma.

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 7
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Solute concentration is higher in the external solution
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 7
If the solute concentration is higher in the external solution than the cell kept in it, then the solution is called as hypertonic. When a cell is kept in hypertonic solution then the cell shrinks, as water comes out of the cell.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 8
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Plasmolysis occurs due to
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 8
Exosmosis is a process in which the water molecules move from higher concentration region of the cell to the lower concentration region of surroundings through the cell membrane. Due to this, the cell shrinks. This happens when a cell is kept in hypertonic solution, i.e., a solution with higher solute concentration. Exosmosis is also termed as plasmolysis.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 9
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Amoeba acquires its food through a process termed as
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 9
Endocytosis is the process of engulfing food particles from the exterior medium with the help of cell membrane. In this process a food vacuole enclosing the food is formed by extending the pseudopodia and encircling it.

Example, Amoeba

So, the correct answer is 'Endocytosis'

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 10
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Root hairs of plants obsorve water from soil through:
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 10
Osmosis is the process of the movement of solvent molecules through a semipermeable membrane from a region of higher solvent concentration to the region of lower solvent concentration. Osmosis is of great importance in biological processes. As the soil has a higher concentration of water as compared to the root hair cells thus osmosis occurs.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 11
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Main difference between animal cell and plant cell is:
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 11
The animal cell is heterotrophic, i.e., cannot synthesize their own food. They have to obtain food from other organisms.

Plant cells possess chloroplast using which they can synthesize their own food material, i.e., they are autotrophic. Therefore, their mode of nutrition differs.

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 12
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The in foldings in mitochondria are known as
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 12
Cristae are folds in the inner membrane of a mitochondrion that increases its surface area for chemical reactions to occur and gives the inner mitochondrial membrane its characteristic wrinkled shape. It is the site of aerobic cellular respiration and has important proteins attached on it, including ATP synthase and a variety of cytochromes.

The answer is A) Cristae.

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 13
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Chlorophyll is present in
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 13
Chloroplasts are double membrane bound eukaryotic cell organelles. Chloroplasts have an internal membrane system, which is made up of thylakoid membranes. The thylakoid membranes contain chlorophyll pigment. The chlorophyll pigments in thylakoid membrane carry out the light reaction part of photosynthesis, whereas the stroma has enzymes, which carry out Calvin cycle or dark reaction part of photosynthesis.
Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 14
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Colourless plastids are known as
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 14
The chloroplast is a type of plastid which produces green coloured pigment. The chloroplast is involved in carrying out photosynthesis. It gives a green colour to leaves.

Chromoplasts are a type of plastids which are responsible for the characteristic colour of flower and fruit. They are involved in attracting insects, various vectors for pollination and for fruit dispersal.

Leucoplasts are colourless plastids and mainly help in storage of food compounds like starch, proteins or fats. Such colourless plastids are present in underground roots, stems. Thus, the correct answer is option A.

Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 15
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Which of these is not related to endoplasmic reticulum?
Detailed Solution for Olympiad Test: Cell - The Fundamental Unit of Life- 3 - Question 15
Endoplasmic reticulum (ER) exists as a membranous network enclosing a fluid-filled lumen which almost fills up the intracellular cavity. The network of the endoplasmic reticulum is present all over the cell. The endoplasmic reticulum is connected to the nuclear envelope. So, it behaves as transport channel for proteins between nucleus and cytoplasm. The ER facilities transport of materials from one part of the cell to another, thus forming the cell's circulatory system. Mitochondria is the site of energy generation. It is not generated in the endoplasmic reticulum.

So, the correct answer is option C.

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