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 reticulumReason : SER is mainly involved in protein synthesis.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?

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

Reason : SER is mainly involved in protein synthesis.

a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.

Correct answer is option 'C'. Can you explain this answer?

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

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Direction: In the following questions, a statement of assertion (A) i...

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.

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Direction: In the following questions, a statement of assertion (A) i...

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

Reason: SER is mainly involved in protein synthesis.

The correct answer is option 'C' - Assertion (A) is true but reason (R) is false.

Explanation:
The endoplasmic reticulum (ER) is a network of interconnected membranous tubules and sacs present in the cytoplasm of eukaryotic cells. It plays a crucial role in various cellular functions, including protein synthesis, lipid metabolism, and detoxification.

Smooth Endoplasmic Reticulum (SER):
- The smooth endoplasmic reticulum (SER) is a part of the endoplasmic reticulum that lacks ribosomes on its surface.
- It appears smooth under the microscope, hence the name.
- SER is involved in various metabolic processes, such as lipid synthesis, metabolism of carbohydrates, detoxification of drugs and toxins, and regulation of calcium levels in muscle cells.

Protein Synthesis:
- Protein synthesis primarily occurs in the ribosomes, which can be free-floating in the cytoplasm or attached to the endoplasmic reticulum.
- The endoplasmic reticulum with ribosomes attached to its surface is called the rough endoplasmic reticulum (RER).
- RER is involved in the synthesis, folding, and modification of proteins that are destined to be secreted from the cell or inserted into the cell membrane.

Explanation of the Assertion and Reason:
- The assertion states that the endoplasmic reticulum lacking ribosomes is called smooth endoplasmic reticulum, which is a correct statement.
- However, the reason provided for this is incorrect. The smooth endoplasmic reticulum (SER) is not primarily involved in protein synthesis. It is mainly involved in lipid metabolism, detoxification, and calcium regulation.
- Therefore, while the assertion is true, the reason is false.
- Hence, option 'C' is the correct answer.

Answered by Dr Manju Sen · View profile

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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 : The endoplasmic reticulum which lacks ribosomes is called smooth endoplasmic reticulumReason : SER is mainly involved in protein synthesis.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?

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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 : The endoplasmic reticulum which lacks ribosomes is called smooth endoplasmic reticulumReason : SER is mainly involved in protein synthesis.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about 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 reticulumReason : SER is mainly involved in protein synthesis.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 reticulumReason : SER is mainly involved in protein synthesis.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?.

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