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Ascent of Sap - Basic

Dear Readers,

The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. Xylem is a complex tissue consisting of living and non-living cells. The conducting cells in xylem are typically non-living and include, in various groups of plants, vessels members and tracheids.

Q1.  A sufficient atmospheric pressure required to push the water upto the top of tall plants must be

  •  2 atm
  •  6 atm
  •  20 atm
  •  All of these

20 atm

Q2.  At mid-day hours, the xylem sap is in a state of

  •  Compression
  •  Tension
  •  Relaxation
  •  Adhesion

Tension

Q3.  The potential of water in the vessels of xylem is low. It is due to

  •  High osmotic concentration
  •  High OP
  •  Transpiration induced tension
  •  Root pressure

Transpiration induced tension

Q4.  Veins are present in the leaves carry

  •  Waste products
  •  Alkaloids
  •  Sap
  •   Oxygen

Sap

Q5.  Positive root pressure can be demonstrated

  •  At noon
  •  In the early morning
  •  In the evening
  •  Only during night

In the early morning

Q6.  Who proposed the "Relay pump theory" of ascent of sap

  •  Bose
  •  Westen
  •  Godlewski
  •  Strasburger

Godlewski

Q7.  According to one vital force theory, ascent of sap is due to active pulsation of innermost layer of cortex. This theory was given by

  •  J. C. Bose
  •  Dixon
  •  Strasburger
  •  Sacks

J. C. Bose

Q8.  Pressure bomb technique was used by

  •  Scholander et al
  •  Kramer et al
  •  Dixon et al
  •  None of these

Scholander et al

Q9.  How water rises from the rhizoids of Riccia to its assimilatory filaments ? It is through

  •  Osmosis
  •  Root pressure
  •  Capillary
  •  Transpiration pull

Osmosis

Q10.  In plants, movement of water against gravitational force is due to

  •  Biostatic theory
  •  Transpiration pull
  •  Water cohesion
  •  Transpiration pull and water cohesion theory

Transpiration pull and water cohesion theory



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