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Sieve tubes do not have nuclei, why are ...

Sieve tubes do not have nuclei, why are they considered as living cells?

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Sieve tubes are considered as living cells without nucleus because, the nucleus of companion cells control their functional activities.
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PEARSON IIT JEE FOUNDATION-TISSUES -MASTERING THE CONCEPTS (APPLICATION AND ANALYSIS )
  1. Why thickness of the stem increases as age advances in dicot plants?

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  2. Why heartwood is considered more durable than the sapwood?

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  3. Sieve tubes do not have nuclei, why are they considered as living cell...

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  4. Cuticle is absent on epidermis of roots. Give reason.

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  5. Vascular tissue is responsible for survival of plants in terrestrial c...

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  6. Epidermal cells secrete thick and waxy layer in cactus. Why?

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  7. Comment on the following statement. One of the characteristic featu...

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  8. Why are the surfaces of woody plants impermeable to water and gases?

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  9. Young stems (twigs) bend but do not break. Why?

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  10. Why are inte-rvertebral discs considered to be the strongest form of c...

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  11. Mention the type of adipose tissue found in infants. How does it diffe...

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  12. Why is spleen known as hematopoietic and haemolytic tissue?

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  13. Why do wrinkles appear on the skin with growing age?

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  14. Can a person survive if blood is completely drained out from the body?...

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  15. In old people knees make a bit crunching sound when they change their ...

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  16. Why does our skin shiver during winter?

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  17. There are 270 bones in the human body at the time of birth. Does this ...

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  18. Why do we sweat when we do physical exercise?

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  19. Clusters of egg cells are not considered as tissue. Give reason.

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  20. Epithelial tissue in animals is non-vascular but permeable. Give reaso...

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