Transport in Plants

Question 1

What is transpiration

Answer 1

Transpiration is the loss of water vapor through the aerial parts of the plant , it occurs mainly through the stomata of the leaves , t

Question 2

Where is the water evaporated from in during transpiration

Answer 2

• The intercellular air spaces of spongy mesophyll layer is always saturated with water vapor due to evaporation of water from the thin film of moisture
• When the stomata opens water vapor will diffuse out through the stomata due to the lower vapor concentration in the atmosphere

Question 3

What is transpiration pull

Answer 3

Transpiration pull is the continuous unbroken column called the transpiration stream which is caused by the cohesion between the water molecules prevents the water column from breaking apart while adhesion to the xylem walls prevents the water column from slipping back down .

Question 4

What causes transpiration pull

Answer 4

when transpiration occurs Water vapor diffuses out of the leaf through the stomata into the atmosphere down a water vapor concentration gradient

6. Movement of water out of the cells to replace the thin film of moisture that has evaporated which decreases the mesophyll cell’s cells sap water potential
7. The mesophyll cells absorb water via osmosis from the cells deeper in the leaf
8. This produces a pulling force that brings the column of water in the xylem vessels up ⇒ This is Transpiration pull