Advertisements
Advertisements
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
APPEARS IN
संबंधित प्रश्न
How are simple tissues different from complex tissues in plants?
Give two functions of collenchyma.
What are tracheary elements? Describe their functions.
What is the difference between parenchyma and collenchyma?
What do you know about complex tissue? Classify and explain its different types in plants with suitable diagrams.
The question has four answers. Choose the correct answer:
The parenchymatous tissue is
The question has four answers. Choose the correct answer:
Collenchymatous hypodermis is found in
While doing work and running, you move your organs like hands, legs, etc. Which among the following is correct?
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 |
Fibers are extensively longer ranging from 20 mm to 550 mm ______.
