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Which tissue forms a protective layer that becomes impervious to gases and water in older plants?
- a)Phloem
- b)Epidermis
- c)Cork
- d)Parenchyma
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which tissue forms a protective layer that becomes impervious to gases...
In older plants, cork forms a protective layer that is impervious to gases and water, effectively serving as an external protective tissue. Option C is correct.
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Which tissue forms a protective layer that becomes impervious to gases...
Understanding Cork Tissue
Cork is a specialized tissue that plays a crucial role in the protection of older plants. Here’s a detailed explanation of why cork is the correct answer.
Protective Layer
- Cork forms a protective layer on the outer surface of stems and roots.
- As plants age, cork cells develop and create a thick, impermeable barrier.
Impervious to Gases and Water
- The cork tissue contains suberin, a waxy substance.
- Suberin makes the cork layer resistant to water and gases, preventing the loss of moisture and protecting against pathogens.
Role in Plant Health
- This impermeability is vital for maintaining internal moisture levels, especially in adverse environmental conditions.
- It also serves as a defense mechanism, safeguarding the plant from environmental stresses and physical damage.
Comparison with Other Tissues
- Unlike phloem, which is involved in nutrient transport, and parenchyma, which is primarily for storage, cork focuses on protection.
- The epidermis, while also protective, does not develop the same level of impermeability as cork in older plants.
Conclusion
In summary, cork tissue is essential for older plants, providing a robust protective layer that is both water and gas impermeable. This adaptation is crucial for the longevity and survival of plants in various environments.
Cork is a specialized tissue that plays a crucial role in the protection of older plants. Here’s a detailed explanation of why cork is the correct answer.
Protective Layer
- Cork forms a protective layer on the outer surface of stems and roots.
- As plants age, cork cells develop and create a thick, impermeable barrier.
Impervious to Gases and Water
- The cork tissue contains suberin, a waxy substance.
- Suberin makes the cork layer resistant to water and gases, preventing the loss of moisture and protecting against pathogens.
Role in Plant Health
- This impermeability is vital for maintaining internal moisture levels, especially in adverse environmental conditions.
- It also serves as a defense mechanism, safeguarding the plant from environmental stresses and physical damage.
Comparison with Other Tissues
- Unlike phloem, which is involved in nutrient transport, and parenchyma, which is primarily for storage, cork focuses on protection.
- The epidermis, while also protective, does not develop the same level of impermeability as cork in older plants.
Conclusion
In summary, cork tissue is essential for older plants, providing a robust protective layer that is both water and gas impermeable. This adaptation is crucial for the longevity and survival of plants in various environments.
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Question Description
Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer? for Class 9 2026 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer?.
Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer? for Class 9 2026 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which tissue forms a protective layer that becomes impervious to gases and water in older plants?a)Phloemb)Epidermisc)Corkd)ParenchymaCorrect answer is option 'C'. Can you explain this answer?.
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