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प्रश्न
Explain how sieve tubes manage to be living?
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उत्तर
Sieve tube elements of phloem tissue lack nucleus but still they manage to live. This is because they are connected to the companion cells of phloem tissue via numerous plasmodesmata. Both sieve tube elements and companion cells develop from the same meristematic cell and form a functional unit. Companion cells provide proteins, ATP, and other signalling molecules to the sieve tube member as it contains extra number of mitochondria and ribosomes
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संबंधित प्रश्न
Which tissue makes up the husk of coconut?
What are tracheary elements? Describe their functions.
What is simple tissue? Classify and explain its different types with suitable diagram.
Name one place in a living organism where the following tissues are located:
Sclerenchyma
Study the diagram given below and then answer the question that follows:
State the function of the parts labelled 1, 2, 3 and 4.
Define the following:
Permanent tissue
Give the structure and function of the following:
Phloem
The question has four answers. Choose the correct answer:
The parenchymatous tissue is
Match the column (A) with the column (B)
| (A) | (B) | ||
| (a) | Parenchyma | (i) | Thin walled, packing cells |
| (b) | Photosynthesis | (ii) | Carbon fixation |
| (c) | Aerenchyma | (iii) | Localized thickenings |
| (d) | Collenchyma | (iv) | Buoyancy |
| (e) | Permanent tissue | (v) | Sclerenchyma |
Name any two simple and two complex permanent tissues in plants.
