Transport in plants

Question 1

What is transpiration?

Answer 1

Transpiration is water loss through the stomata of the plant cell. Where water moves from the high potential of the inside of the leaf to the lower water potential from the outside of the leaf.

Question 2

What are xylem vessels made from? And why are they essentially empty

Answer 2

dead cells. And since they are dead they dont need extra organelles for all the different normal functions of a cell function and therefore they are empty

Question 3

what is lignin?

Answer 3

One of the last substances xylem cells produce before dying. Can be produced and released in rings and helices. Component of rigid cell wall in xylem cell tissue

Question 4

What is the importance of lignin in the structure of xylem vessels?

Answer 4

The very strong and supportive lignin prevents the xylem vessels from collapsing under pressure, by making the xylem vessels very rigid and woody.

Question 5

What are phloem vessels for?

Answer 5

Movement of organic substances like glucose and ions

Question 6

What are the components of the phloem vessels/tissues?

Answer 6

The two key components of the phloem tissue are the sieve tube cells and companion cells.

Question 7

Describe the structure and function of the companion cells in the phloem?

Answer 7

Companion cells are living cells that essentially function for the production of ATP and other substances required for the active transport of organic substances in the phloem , as they contain all the organelles. Companion cells are always neighbouring/positioned sieve tube cells and are connected to sieve tube cells through plasmodesmata.

Question 8

Companion cells

Answer 8

have many mitochondria to provide the sieve tube cells with enough ATP for active transport of organic substance.