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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The humidity of rainforests is largely due to

  1. Guttation
  2. Transpiration
  3. Photosynthesis
  4. Respiration
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The evolution of C4 plants is probably one of the strategies to

  1. Maximize oxygen availability
  2. Maximize Carbon dioxide availability
  3. Minimize water loss
  4. Both B and C
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C4 plants are …….as efficient as C3 plants in term of making sugar and lose only ….. of the water in comparison.

  1. Half, double
  2. Twice, half
  3. One fourth, one third
  4. Twice, one third
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Most of the minerals are absorbed through active transport because

  1. Minerals are charged particles
  2. Minerals are insoluble in lipid bilayer
  3. The amount of mineral is less in soil
  4. All of these
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Which of the following statements is not correct?

  1. Some ions also move in epidermal cells passively
  2. The active uptake of ions is partly responsible for the water potential gradient in the roots.
  3. Uptake of water by the roots is through osmosis
  4. Transport proteins of pericycle are control points where a plant adjusts the quantity and types of solute which will cross the cell membrane
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