Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 2


10 Questions MCQ Test Online MCQ Tests for Class 9 | Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 2


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Attempt Test: Cell - The Fundamental Unit of Life- Assertion & Reason Type Questions- 2 | 10 questions in 20 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Online MCQ Tests for Class 9 for Class 9 Exam | Download free PDF with solutions
QUESTION: 1

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Chloroplast performs photosynthesis.

Reason : Chloroplast comprises photosynthetic pigments.

Solution: Chloroplast is involved in the process of photosynthesis. It comprises a photosynthetic pigment called chlorophyll, which trap energy from the Sun.
QUESTION: 2

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Leucoplasts perform photosynthesis.

Reason : Chloroplasts store fats, starch and proteins.

Solution:

Chloroplasts perform photosynthesis while leucoplasts are storage plastids.

QUESTION: 3

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 semi-autonomous cell organelle.

Reason : Mitochondria generate energy.

Solution: Mitochondria have their own DNA and ribosome to make proteins. It can replicate independent of nuclear DNA of cells. Hence, it is known as semi-autonomous organelle. It is also associated with ATP production.
QUESTION: 4

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Plasma membrane is selectively permeable.

Reason : Plasma membrane allows some molecules to pass through it more easily than others.

Solution: Each cell is bound by an extremely delicate, thin, elastic, selectively permeable, living membrane called plasma membrane. It is selectively permeable as it allows some molecules to pass through more easily than others.
QUESTION: 5

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Human RBCs burst in hypotonic solution.

Reason : Cells burst due to endosmosis.

Solution: Human red blood cells when they are placed in hypotonic solution, they burst due to endosmosis.
QUESTION: 6

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The endoplasmic reticulum which lacks ribosomes is called smooth endoplasmic reticulum

Reason : SER is mainly involved in protein synthesis.

Solution: Smooth Endoplasmic Reticulum (SER) possesses smooth membranes which do not bear ribosomes. SER is responsible for synthesis of fats inside the cells of adipose tissue, formation of sphaerosomes, synthesis of glycogen as well as glycogenolysis (hydrolysis of glycogen) in liver cells, synthesis of sterols and steroid hormones as in the interstitial cells of testis and ovary and formation of visual pigments from vitamin A in retinal cells.
QUESTION: 7

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 swells up when present in a hypotonic solution.

Reason : More water molecules enter the cell than they leave.

Solution: If a cell is placed in a hypo-tonic solution which has lower concentration of solute and higher concentration of water as compared to the concentration of cell sap (i.e., the solution inside the cell), the water molecules move from external solution into the cell sap and thus, the cell swells.
QUESTION: 8

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 and chloroplasts are semiautonomous organelles.

Reason : They are formed by division of pre-existing organelles and contain DNA but lack protein synthesizing machinery.

Solution: Both mitochondria and chloroplasts are double membrane bound, semi-autonomous cell organelles. Their structure and functions are partially controlled by nucleus of the cell and partially by themselves. Both possess their own DNA and arise from the

pre-existing cells. 70S type of ribosome is present in both organelles which can help to translate the coded information contained in mRNA and protein synthesis.

QUESTION: 9

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Prokaryotes have a one envelop system.’

Reason: There is not even a single membrane that surrounds the prokaryotic cell.

Solution: Most prokaryotic cell particularly the bacterial cells have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure, i.e. the outermost glycocalyx followed by the cell wall and plasma membrane. Although each layer of the envelope performs distinct function, they act together as a single protective unit.
QUESTION: 10

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Eukaryotic cells have membrane bound organelles.

Reason: Prokaryotic cells lack membrane bound organelles.

Solution: Eukaryotic cells which have membrane bound distinct structures called organelles like nucleus, endoplasmic reticulum (ER), Golgi complex, lysosomes, mitochondria, microbodies and vacuoles. These are found in all protists, plants, animals and fungi. Prokaryotic cells lack such membrane bound organelles. Prokaryotic cells occur in bacteria, archaea, blue-green algae, mycoplasma and PPLO. Genetic material in these cells lies naked in the cytoplasm.
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