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Assertion (A): Most of plant tissues are dead.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Most of plant tissues are dead.Reason (R): Due to the s...
Assertion (A): Most of plant tissues are dead.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
The correct answer is A. Both A and R are true and R is the correct explanation of A.
Explanation:
- Plants have two types of tissues: meristematic tissues and permanent tissues.
- Meristematic tissues are actively dividing cells and are responsible for growth in plants.
- Permanent tissues, on the other hand, are non-dividing cells that provide mechanical support, transport water and nutrients, and store food.
- Most of the permanent tissues in plants are dead, meaning they have lost their metabolic functions.
- The reason for this is that dead cells provide mechanical strength more easily than live ones, as they have rigid cell walls and do not require energy for maintenance.
- Dead cells also provide structural support to the plant, allowing it to stand upright.
- In contrast, live cells are metabolically active and require energy for maintenance and growth.
- The sedentary existence of plants, being rooted in the ground, makes it more advantageous for them to have dead tissues that require less maintenance.
- Therefore, the reason provided in R explains why most plant tissues are dead.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
The correct answer is A. Both A and R are true and R is the correct explanation of A.
Explanation:
- Plants have two types of tissues: meristematic tissues and permanent tissues.
- Meristematic tissues are actively dividing cells and are responsible for growth in plants.
- Permanent tissues, on the other hand, are non-dividing cells that provide mechanical support, transport water and nutrients, and store food.
- Most of the permanent tissues in plants are dead, meaning they have lost their metabolic functions.
- The reason for this is that dead cells provide mechanical strength more easily than live ones, as they have rigid cell walls and do not require energy for maintenance.
- Dead cells also provide structural support to the plant, allowing it to stand upright.
- In contrast, live cells are metabolically active and require energy for maintenance and growth.
- The sedentary existence of plants, being rooted in the ground, makes it more advantageous for them to have dead tissues that require less maintenance.
- Therefore, the reason provided in R explains why most plant tissues are dead.
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Assertion (A): Most of plant tissues are dead.Reason (R): Due to the s...
Assertion (A): Most of plant tissues are dead.
Plant tissues can be classified into two main types: living tissues and dead tissues. A significant portion of plant tissues, particularly in the context of structural support, consists of dead cells. Examples include:
- **Sclerenchyma:** This tissue provides strength and support. It is composed of dead cells with thickened walls, making it ideal for structural integrity.
- **Xylem:** Responsible for water transport, xylem vessels are formed from dead cells that create a hollow tube, allowing for efficient movement of water and nutrients.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
The sedentary lifestyle of plants means they remain fixed in one location. As a result, they require tissues that provide stability and support. Dead cells fulfill this role effectively:
- **Mechanical Strength:** Dead cells, like those in sclerenchyma and xylem, have rigid structures that offer stronger support than living cells, which are often more flexible and can be prone to damage.
- **Less Maintenance:** Dead tissues do not require metabolic energy for maintenance, making them ideal for a plant's energy conservation.
Conclusion:
- **Both A and R are true and R is the correct explanation of A.**
- The assertion is accurate as a large proportion of plant tissues are indeed dead, primarily for structural purposes. The reason effectively explains why dead tissues are advantageous for plants, due to their need for mechanical strength and lower maintenance.
Thus, the correct answer is option 'A'.
Plant tissues can be classified into two main types: living tissues and dead tissues. A significant portion of plant tissues, particularly in the context of structural support, consists of dead cells. Examples include:
- **Sclerenchyma:** This tissue provides strength and support. It is composed of dead cells with thickened walls, making it ideal for structural integrity.
- **Xylem:** Responsible for water transport, xylem vessels are formed from dead cells that create a hollow tube, allowing for efficient movement of water and nutrients.
Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.
The sedentary lifestyle of plants means they remain fixed in one location. As a result, they require tissues that provide stability and support. Dead cells fulfill this role effectively:
- **Mechanical Strength:** Dead cells, like those in sclerenchyma and xylem, have rigid structures that offer stronger support than living cells, which are often more flexible and can be prone to damage.
- **Less Maintenance:** Dead tissues do not require metabolic energy for maintenance, making them ideal for a plant's energy conservation.
Conclusion:
- **Both A and R are true and R is the correct explanation of A.**
- The assertion is accurate as a large proportion of plant tissues are indeed dead, primarily for structural purposes. The reason effectively explains why dead tissues are advantageous for plants, due to their need for mechanical strength and lower maintenance.
Thus, the correct answer is option 'A'.
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Assertion (A): Most of plant tissues are dead.Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer?
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ample number of questions to practice Assertion (A): Most of plant tissues are dead.Reason (R): Due to the sedentary existence of plants, dead cells provide mechanical strength more easily than live ones and need less maintenance.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 9 tests.
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