Number and distribution of stomata, Per cent of open stomata, water status of the plant, Canopy Structure, Temperature, light, Humidity, wind speed

How many factors are externally and internally affecting transpiration?

  1. 5,3
  2. 4,4
  3. 3,5
  4. 2,6
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Transpiration driven ascent of xylem depends on which of the following properties of water?

  1. Cohesion
  2. Adhesion
  3. Surface tension
  4. All of these
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Cohesion, adhesion and surface tension of water provides it

  1. High tensile strength
  2. High capillarity
  3. High transpiration pull
  4. Both A and B
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Tensile strength is

  1. Mutual attraction between water molecules
  2. Attraction of water molecules to polar surfaces
  3. More attraction in water molecules in liquid phase than in gaseous phase
  4. An ability to resist a pulling force.
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Cohesion is

  1. Mutual attraction between water molecules
  2. Attraction of water molecules to polar surfaces
  3. More attraction in water molecules in liquid phase than in gaseous phase
  4. An ability to resist a pulling force.
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Capillarity is not aided by

  1. Cohesion
  2. Adhesion
  3. Tensile strength
  4. Small diameters of the tracheary elements- the tracheids and vessels
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The forces which are generated in xylem by transpiration pull can cause lifting of water up to

  1. 110 metres
  2. 13 metres
  3. 130 metres
  4. 19 metres
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Evaporation from the leaf at first sets up a pressure gradient between the

  1. Outside air and cytoplasm of cells of leaf
  2. Outside air and air spaces of the leaf
  3. Outside air and xylem cells of the leaf
  4. Outside air and palisade cells of leaf
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Which of the following is not a purpose of Transpiration?

  1. Absorption of minerals and water from the soil and transport in the plants
  2. Supplies water for photosynthesis
  3. Evaporative heating
  4. Maintains the shape and structure of the plants by keeping cells turgid
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Transpiration can cool the leaf surface up to

  1. 10 to 15 degrees
  2. Up to 70 degrees
  3. Up to 2 degrees
  4. Up to 50 degrees
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