Transportation

Question 1

State the functions of xylem tissue

Answer 1

• Transports water/mineral ions
• Roots absorbs these from soil
• These travels upwards in the stem to the leaves, flower,fruits

Question 2

State the functions of phloem tissue(2 direction)

Answer 2

• Transports sucrose,amino acids,hormones throughout the plants
• Downwards from leaves to roots
• Upwards from leaves to flowers,fruit.

Question 3

Water passes into root hair by what?

Answer 3

Osmosis

Question 4

Function of roots

Answer 4

Anchor the plant in soil

Question 5

Functions of root hair cells

Answer 5

Thin, permeable cell walls/Provide large SA for absorption of water

Question 6

State the pathway taken by water

Answer 6

From root hair cell, cortex cell,xylem vessel, mesophyll cells.

Question 7

Define transpiration

Answer 7

Evaporation of water at the surfaces of mesophyll cells followed by loss of water vapor from plant leaves,through the stomata.

Question 8

Describe how water vapour loss is related to cell surfaces, air spaces and stomata

Answer 8

Plants must close their stomata in order to preserve water, usually during a period of drought.However, this prevents the release of oxygen which would become toxic if concentrate highly enough.

Question 9

Explain the mechanism of water uptake and movement in terms of tranpiration

Answer 9

Water is not pushed from roots up to leaves, it is pulled by evaporation of water, is is pulled up by the xylem in stem from roots to leaves(transpiration pull) ,drawing cohesive water molecules up the plant

Question 10

Define translocation

Answer 10

The movement of sucrose and amino acids in phloem; from regions of production to regions of storage or to regions of utilization in respiration or growth.