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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
Name the regions in which parenchyma tissue is present.
Why are xylem and phloem called complex tissues?
What is the differences between collenchyma and sclerenchyma?
What are the functions of phloem?
Differentiate between cells of Parenchyma and Collenchyma.
Give the structure and function of the following:
Collenchyma
The question has four answers. Choose the correct answer:
A component of xylem is
Write a short note on peculiarity of a sclerenchyma cell wall.
Explain sclereids with their types.
What are sieve tubes? Explain.
