Transpiration

Question 1

Give an description of transpiration

Answer 1

Water is lost through the stomata by evaporation. This pulls water up from the roots through the xylem and this is called transpiration

Question 2

What is the importance of transpiration?

Answer 2

• provides water to cells to keep them turgid
• provides water to cells for photosynthesis
• transports miner ions to the leaf

Question 3

Give the description of translocation

Answer 3

The movement of dissolved sugars from the leaves to the rest of the plant through the phloem

Question 4

What is the importance of translocation?

Answer 4

• moves dissolved sugars made in the leaves during photosynthesis to other parts of the plants
• this allows for respiration, growth and glucose structure

Question 5

What are the 4 factors affecting the rate of transpiration

Answer 5

• temperature
• humidity
• wind speed
• light intensity

Question 6

Explain why temperature affects the rate of transpiration?

Answer 6

Higher temperature increases the rate of transpiration….

Because water evaporates faster in higher temperature

Question 7

Explain why humidity affects the rate of transpiration

Answer 7

Lower humidity increases the rate of transpiration….

Because the drier the air, the steeper the concentration gradient of water molecules between the air and leave

Question 8

Explain why wind speed affects the rate of transpiration

Answer 8

More wind increases the rate of transpiration …

Because the wind removes the water vapour quickly, maintaining a steeper concentration gradient

Question 9

Why does light intensity affect the rate of transpiration?

Answer 9

Higher light intensity increases the rate of transpiration…

Because stomata open wider to let more carbon dioxide into the leaf for photosynthesis