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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
Identify the type of tissue in the vascular bundle.
Distinguish between tracheids and vessels.
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:
Name the parts labelled 1, 2, 3 and 4.
A permanent tissue is of how many types?
Give the structure and function of the following:
Phloem
Name the tissue associated with the following:
Conduction of water in the plant body.
The question has four answers. Choose the correct answer:
Hard lignified thick walled, long and pointed cells in a plant are
What are sieve tubes? Explain.
Differentiate fibers from sclereids.
