Transport Systems

Question 1

How many transport systems are there in a plant?

Answer 1

Two transport systems

Question 2

What are the two type types of transport systems?

Answer 2

• Xylemn vessels
• Phloem vessels

Question 3

what does it mean that most plants are dicotyledenous?

Answer 3

They have 2 seed leaves when they germinate

Question 4

What does cotyledon mean in plants?

Answer 4

It refers to the first seed leaves present in the embryo

Question 5

where can gases diffuse in and out of the plant?

Answer 5

gases can diffuse in and out of the plant via the stomata

Question 6

why do gases diffuse fast in the stomata?

Answer 6

• Leaves are thin and have a big surface area
• fast enough to meet the demands of the leaf cells for oxygen (respiration) and carbon dioxide (photosynthesis)

Question 7

Can gases diffuse in and out of root hair cells?

Answer 7

• Yes
• they are adapted to have a large surface area in order to achieve this

Question 8

Do plants have high oxygen requirements than plants? why?

Answer 8

• No
• They are not as active animals
  so they do not need high rate of respiration

Question 9

Do plants need specialized transport systems?

Answer 9

• yes
• to deliver water, mineral ions and organic solutes to different cells and tissues.

Question 10

How does water move from the root hair, across the root, up stem, into leaf and evaporate out of the stomata?

Answer 10

• water moves along a water potential gradient through the plant.
• from regions of higher water potential to regions of lower water potential, starting in the root hair cells
• it eventually leaves the plants by evaporating as vapour from the stomata into the air.

Question 11

What is a transpiration stream?

Answer 11

the movement of water up the plant

Question 12

what is transpiration?

Answer 12

The evaporation of water vapour from the stomata.

Question 13

How does water move across the root?

Answer 13

• Mineral ions move into the root hair cells by a combination of facilitated diffusion and active transport
• lowering the water potential inside the cells
• water then moves from the soil into the root hair cell by osmosis due to water potential gradient

Question 14

what is osmosis?

Answer 14

Osmosis is the movement of water molecules from an area of higher water potential to an area of lower water potential across a selectively permeable membrane.