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प्रश्न
Explain how sieve tubes manage to be living?
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
How are simple tissues different from complex tissues in plants?
Name the regions in which parenchyma tissue is present.
Draw a well labelled diagram of parenchyma and collenchyma.
Explain different types of elements present in phloem.
Name the different types of elements found in the xylem.
What are different types of tissues in plants? Describe simple tissues.
Give the structure and function of the following:
Crystal
The question has four answers. Choose the correct answer:
A component of xylem is
Differentiate between meristematic and permanent tissues in plants
Match the followings and choose the correct option from below
| Column I | Column II |
| A. Meristem | i. Photosynthesis, storage |
| B. Parenchyma | ii. Mechanical support |
| C. Collenchyma | iii. Actively dividing cells |
| D. Sclerenchyma | iv. Stomata |
| E. Epidermal tissue | v. Sclereids |
