Advertisements
Advertisements
प्रश्न
Explain how sieve tubes manage to be living?
Advertisements
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
APPEARS IN
संबंधित प्रश्न
How many types of elements together make up the xylem tissue? Name them.
What are the functions of the stomata?
Identify the type of tissue in the bark of tree.
Identify the type of tissue in the vascular bundle.
Draw a well labelled diagram of phloem.
Distinguish between tracheids and vessels.
What is simple tissue? Classify and explain its different types with suitable diagram.
A permanent tissue is of how many types?
The question has four answers. Choose the correct answer:
Collenchymatous hypodermis is found in
In which of the following pairs of parts of a flowering plant is epidermis absent?
