phloem

Question 1

What is the function of phloem and which way does it transport ?

Answer 1

The function of phloem is to transport sugars mainly sucrose up and down the plant

Question 2

What does phloem tissue consist of?

Answer 2

Sieve tube elements, companion cells

Question 3

Are sieve tubes true cells and are they living?

Answer 3

Sieve tubes are not true cells as they have no nucleus and very little cytoplasm, however they are living cells.

Question 4

How do sieve tubes line up?

Answer 4

End to end to form a column with cross walls at intervals, these cross walls are known as sieve plates which are perforated by many pores to allow sap to run through (flow through)

Question 5

What is sucrose dissolved in to form sap?

Answer 5

Water

Question 6

Do sieve tubes have thick or thin walls?

Answer 6

Thin walls 5 or 6 sided

Question 7

Wher do companion cells lie?

Answer 7

Between sieve tubes they have a large nucleus a dense cytoplasm and numerous mitochondria

Question 8

Why do companion cells contain numerous mitochondria?

Answer 8

To produce ATP for active processes such as metabolic processes such as toto load sucrose into the sieve tube elements

Question 9

The cytoplasm of companion cells and the sieve tube elements are linked through many what?

Answer 9

Plasmodesmata which are gaps in the walls allowing communication and the flow of minerals between the cells.