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What category of a permanent plant cell is companion cell

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Companion cells are specialised thin walled parenchymatous cells found to be associated with sieve tubes.
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MODERN PUBLICATION-ANATOMY OF FLOWERING PLANTS -REVISION EXERCISES ( Very Short Answer Questions)
  1. In which stem the vascular bundles are arranged in a ring?

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  2. Which types of meristems can be classified on the basis of position in...

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  3. In which type of vascular bundle, xylem is covered on both side by phl...

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  4. Name two specialised kinds of parenchyma.

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  5. Name the tissue represented by the jute fibres used in making ropes.

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  6. Which one out of root or stem shows endarch arrangmcnt of xylem ? What...

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  7. Name the two types of sieve elements found in phloem.

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  8. Name the tissue which provides mechanical strength to the plant organs...

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  9. What makes the roots apical meristem subterminal.

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  10. Where are companion cells located in flowering plants ? What is their ...

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  11. Write two functions of casparian strips in plant roots

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  12. What is the advantage of lignocellulose in wall of xylem ?

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  13. What is hard wood ?

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  14. A cross section of a plant material shows the following features under...

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  15. Name two examples of fruits having sclereids.

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  16. What use are phloem fibres put to ?

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  17. A cross section of a plant material shows the following features under...

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  18. What category of a permanent plant cell is companion cell

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  19. The cross-section of a plant material showed the following features wh...

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  20. The tissues involved in secondary growth of dicot plants are vascular ...

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