TRANSPIRATION

Question 1

Explain the process of transpiration

Answer 1

• )The xylem transports water to the leaves,
• )these water molecules evaporate from the Mesophyll cells
• )which then enter the air spaces
• )When it enters the air spaces it turns into water vapour
• )The vapour then diffuses out of the Stomata down a concentration gradient

Question 2

Where is the site of photosynthesis?

Answer 2

Chloroplast,mostly found in the Mesophyll cells

Question 3

Brief summary of the transpiration stream

Answer 3

Transpiration causes water TO BE ‘pulled up’ the xylem IN the stem AND roots in a continuous cycle

Question 4

Describe 4 functions of the transpiration stream

Answer 4

• Supplies water for photosynthesis
• carries mineral ions dissolved in water
• provides water to keep plant cells turgid
• Allows evaporation from the leaf surface, cooling the leaf down (kinda like sweating)

Question 5

Name 4 factors that effect the rate of transpiration

Answer 5

Humidity, wind, light intensity, temperature

Question 6

How does light intensity affect the rate of transpiration?

Answer 6

• -)As light intensity increases
• -)More stomata open
• -)wider stomata
• -) faster diffusion of water vapour out the leaf

Question 7

How does temperature affect the rate of transpiration?

Answer 7

• -)higher the temp is
• -)the faster molecules move=more kinetic energy
• -)evaporation and diffusion,osmosis happens faster

Question 8

How does wind affect the rate of transpiration?

Answer 8

• -)Wind blows WATER VAPOUR away from the stomata

- -)keeping the concentration gradient high

Question 9

How does humidity affect the rate of transpiration?

Answer 9

Humidity=measure of how much water vapour is in the air

• )increased humidity -) more water vapour in the air
• )Lower concentration gradient between the inside and outside of the leaf
• )Rate of transpiration slooowss