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Epidermal cells secrete thick and waxy l...

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

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In xerophytic plants (cactus), epidermal layer secrets a thick and waxy layer called cuticle which is made up of chitin.
This layer closes the stomata and prevents water loss by transpiration process (water-resistant layer). As cactus plant lives in water-deficit area such thick and waxy cutile is seen.
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PEARSON IIT JEE FOUNDATION-TISSUES -MASTERING THE CONCEPTS (APPLICATION AND ANALYSIS )
  1. Cuticle is absent on epidermis of roots. Give reason.

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

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

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

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

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

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

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

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

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

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

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

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  13. Why does our skin shiver during winter?

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

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

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

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

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  18. Thin people feel colder than fat ones. Give reason.

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  19. Blood is known as fluid connective tissue. Give reason.

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  20. Cardiac muscles show rhythmic contractions. Why?

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