Transport In Plants

Question 1

Function of Xylem and Phloem

Answer 1

Transportations of substance from source to sinks.

To support the steam

Question 2

Function of Root Hair Cell

Answer 2

To absorb minerals and water from the soil.

Question 3

Structure of Root hair cell

Answer 3

Elongated body for more surface area to allow water to enter via osmosis and ions via active transport

Question 4

Pathway taken by water

Answer 4

Water enters root hair cell via osmosis.
Water passes through cortex cell via osmosis mostly “suction”.
Water and Minerals are forced into endodermis.
Water enters xylem then leaves when it gets to mesophyll cell.

Question 5

What is Transpiration?

Answer 5

Evaporation of water at surfaces of the mesophyll cells followed by loss of water vapour through the stomata

Question 6

Factors affecting Transpiration.

Answer 6

Temp: Higher temp = more water-holding capacity.
Humidity: low humidity increase water potential gradient between leaf and atmosphere.
Light Intensity: High light intensity cause stomata to open which increase transpiration.

Question 7

Function of Translocation

Answer 7

Movement of sucrose and amino acids in phloem from sources to sinks

Question 8

Definition of Osmosis

Answer 8

Movement of water across a semi-permeable membrane from area of high water concentration to an area of lower water concentration

Question 9

Definition of Active Transport

Answer 9

Movement of molecules across a semi-permeable membrane from a region of lower conc. to a region of high conc.

Question 10

Definition of Water Potential Gradient