What mechanism explains the movement of sucrose from source to sink ?

Evaporation of water and active transport of sucrose from the sink.
Osmotic movement of water into the sucrose-loaded sieve-tube cells creating a higher hydrostatic pressure in the source than in the sink.
Tension created by the differences in hydrostatic pressure in the source and sink.
Active transport of sucrose through the sieve-tube members driven by proton pumps.

In which method of transport in plasma membrane does not require carrer molecule ?

Active transport
Simple diffusion
Facilitated diffusion
Na⁺ – K⁺ pump

A boy is studying transport of a certain type of molecules into cell. He finds that transport slows down when the cells are poisoned with a chemical that inhibits energy production. Under normal circumstances the molecules studied by the boyis probably transported by

simple diffusion
osmosis
active transport
facilitated diffusion

Movement of H₂O through cell wall is called

Apoplast
Symplast
Tonoplast
None of these

Storage capacity of the soil is the extent to which it can hold

Gravitational water
Capillary water
Hygroscopic water
All of the above

Solution

It occurs in the form of film coating smaller soil particles. It is also called growth water.

Passive absorption of water by the root system of the result of

Forces created in the cells of the root
Increased respiratory activity in root cells
Tension on the cell sap due to transpiration
Osmotic force in the shoot system

The continuous excretion of watery substance from stump of a well watered pot plant after cutting off the shoot slightly above the base is due to

Root pressure
Guttation
Transpiration
Imbibition

Imbibition causes

increase in the volume of imbibant but no pressure development.
decrease in the volume of imbibant and pressure develops.
no change in volume of imbibant but pressure develops.
volume of imbibant increases and pressure develops.

Osmosis is diffusion of

solute
free energy
water
solute and solvent

Root pressure is maximum when

Transpiration is high and absorption is very low
Transpiration is very low and absorption is high
Transpiration is very high and absorption is also high
Transpiration and absorption both are show

Solution

Stephentiales (1727) coined the term root pressure, Root pressure is developed when rate of water absorption is more than the rate of transpiration.

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