B4.10 Rates Of Transpiration

Question 1

4 factors that speed up the rate of transpiration

Answer 1

1. increase in light intensity
2. increase in temperature
3. increase in air movement
4. Decrease in humidity

Question 2

Stomata closes in the _________ and opens in the ___________.

Answer 2

1. Dark

2. Light

Question 3

When light intensity is greater, more _____________ will open. Allows more water to _____________, so the rate of _______________ is faster.

Answer 3

1. Stomata
2. Evaporate
3. Tranpiration

Question 4

A higher light intesnity _____________ the rate of _______________. The ___________ open to allow _____________ into the leaves for photosynthesis.

Answer 4

1. Increases
2. Transpiration
3. Stomata
4. Carbon dioxide

Question 5

Explain how increase in temperature affects transpiration.

Answer 5

The higher the temperature, the faster the particles in the air will move. This means that water molecules move faster and evaporate from the leaf quicker- rate of transpiration will increase.

Question 6

Explain how increased air movement effects transpiration.

Answer 6

When air moves over the leaf, it mobes evaporated water molecules away from the leaf.

Faster air movement, quicker the water moved. Increases the diffusion of water out of the leaf, because water molecules do not build up in the air outside the leaf.

Concentration of water outside leaf- low
Concentration gradient high between inisde of leaf and outside- rate of transpiration increases.

Question 7

Explain how decreased humidity effects transpiration

Answer 7

Less humidity in the air, less water there is in it.

Greater concentration gradient betweeen inside and outside of leaf. Water molecules will diffuse out more quickly- increased rate of transpiration.