B7.7-9 Mass Transport In Plants

Question 1

Summarise the cohesion tension theory

Answer 1

Water evaporates from leaves, causing tension in xylem

Water is pulled up due to cohesion between water molecules

Water continuously moves up from roots to leaves

Question 3

What is the xylem

Answer 3

Tissue that transports water via transpiration

Question 4

What is the phloem

Answer 4

Transporta organic substances via translocation

Question 5

What is a source

Answer 5

Produces sugar

Question 6

What is a sink

Answer 6

Uses/stores sugar

Question 7

What is the tracer method

Answer 7

Plant is given radioactive CO2 and makes sugar from it

Question 8

What is the result of the tracer experiment

Answer 8

The radioactive sugars are only found in the phloem, shows how sugars are only transported in the phloem

Question 9

What is the ring experimen

Answer 9

A ring of bark that contains phloem but not xylem is cut

Question 10

What is the result of the ring experiment

Answer 10

Phloem collects above and below the ring, tissues die

Shows how sugars are transported downward in the phloem