Ascent of Sap_MCQ_Basic Level

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