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Water Vapour Loss: Extended

  • Evaporation occurs from the surfaces of spongy mesophyll cells.
  • The numerous interconnecting air spaces between these cells and the stomata result in a substantial surface area.
  • This leads to rapid evaporation when the stomata are open.

Transpiration Stream: Extended

  • Cohesion among water molecules generates a cohesive column, facilitating water movement up the plant.
  • Water is transported through xylem vessels in a continuous stream, propelled from roots to leaves through the stem.
  • Transpiration generates tension, exerting a pull on water within xylem vessels originating from the leaves.
  • Cohesive forces between water molecules contribute to this pull, allowing water to ascend within the plant.
  • Accelerated transpiration rates from leaves result in a swifter ascent of water molecules through xylem vessels.

Transpiration Stream | Biology for GCSE/IGCSE - Year 11

Question for Transpiration Stream
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How does the structure of spongy mesophyll cells contribute to water vapor loss?
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FAQs on Transpiration Stream - Biology for GCSE/IGCSE - Year 11

1. What is transpiration stream in plants?
Ans. The transpiration stream in plants refers to the movement of water from the roots, through the xylem vessels, and eventually out through the stomata in the leaves.
2. How does transpiration help plants?
Ans. Transpiration helps plants by facilitating the uptake of water and essential nutrients from the soil, maintaining turgidity in cells, and cooling the plant through the process of evaporation.
3. What factors affect the rate of transpiration in plants?
Ans. Factors that affect the rate of transpiration in plants include temperature, humidity, wind speed, light intensity, and the availability of water in the soil.
4. How does water loss through transpiration benefit the plant?
Ans. Water loss through transpiration benefits the plant by creating a negative pressure in the xylem vessels, which helps in the upward movement of water and nutrients from the roots to the leaves.
5. How can plants regulate transpiration to prevent excessive water loss?
Ans. Plants can regulate transpiration by closing their stomata during hot and dry conditions, reducing the surface area of leaves, developing thick cuticles, and storing water in specialized tissues.
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