Mycorrhiza

Find the incorrect statement.

  1. Symbiotic association of fungus with root system
  2. Fungal hyphae have a very large surface area that absorb mineral ions and water from the soil
  3. Hyphae can go to downwards in depth and cause absorption of much larger volume of soil that perhaps a root cannot do
  4. Roots provide sugar and S containing compounds to the mycorrhizae
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Pinus has an/a…….. association with mycorrhizae and their …….. without the presence of mycorrhizae.

  1. Obligate, seeds cannot germinate
  2. Facultative, fruits cannot disperse
  3. Obligate, roots can not spread down the soil
  4. Facultative, leaves cannot perform photosynthesis.
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Various ions from the soil are transported by the means of
1. Facilitated Transport
2. Plasmolysis
3. Active transport
4. Imbibition

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Root pressure

  1. Pushing pressure
  2. Negative pressure
  3. Tries to cope up with water requirement of well heighted plants
  4. Effects are observed at day time and evening time
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Water loss in liquid phase from the tip of the grass blades and leaves of herbaceous parts is called

  1. Evaporation
  2. Transpiration
  3. Guttation
  4. Solarization
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Following are some statements which ones are not incorrect?
a. Root pressure only provide a modest push in the overall process of water transport
b. Root Pressure obviously does not play a major role in water movement up tall trees
c. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecules in the xylem which often break under the enormous tensions created by transpiration
d. Most of the plants meet their need by transpiratory pull
e. The exudate of guttation has pure water only
1. a,b,d,e
2. a,b,c,d
3. b,c,d,e
4. c,d,e

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Which of the following is an expected rate of upward flow in plants due to transpiratory pull?

  1. Up to 15 metres per hour
  2. Up to 15 meters per minute
  3. Up to 150 metres per hour
  4. Up to 200 metres per hour
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Which of the following is a model for Transpiration?

  1. Cohesion-AdhesionTranspiration Pull Model
  2. Cohesion Tension Transpiration Pull Model
  3. Tension Transpiration Pull Model
  4. All of these
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……….. of the water reaching the leaves is used in photosynthesis and plant growth

  1. More than 5 per cent
  2. Less than 1 per cent
  3. Less than 10 per cent
  4. More than 2 per cent
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Transpiration can be studied by

  1. Cobalt chloride paper test
  2. Chromium chloride paper test
  3. Leaf enclosed in polybag
  4. Both A and C
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