transpiration and translocation

Question 1

what is transpiration?

Answer 1

when a plant opens its stomata to let in carbon dioxide, water on the surface of the cells of the spongy mesophyll and palisade mesophyll evaporates and diffuses out of the leaf

Question 2

what is translocation?

Answer 2

the movement of sucrose and other substances like amino acids around a plant

Question 3

how does light intensity affect the rate of transpiration?

Answer 3

transpiration increases as light intensity increases. in sunlight, the rate of transportation is faster as the stomata remain open to allow inward diffusion of carbon dioxide for photosynthesis

Question 4

how does air movement affect the rate of transpiration?

Answer 4

as the movement of air increases, the concentration gradient increases so the rate of transpiration increases

Question 5

how does temperature affect the rate of transpiration?

Answer 5

as temperature increases so does the rate of transpiration as water particles gain more energy to diffuse into the plant and evaporate out of the stoma

Question 6

how does humidity affect the rate of transpiration?

Answer 6

when the air is more humid the concentration gradient is reduced so the rate of diffusion is lowered and so the transpiration rate is reduced

Question 7

how do you measure the rate of transpiration?

Answer 7

a potometer

Question 8

the process of the potometer and measuring transpiration

Answer 8

rate of transpiration can be calculated by measuring the distance travelled by an air bubble in a capillary tube over a given time. the faster the bubble moves, the greater the rate of water uptake and so the greater the assumed rate of transpiration

Question 9

method

Answer 9

1. air bubble appears in a capillary tube
2. tap on the reservoir is opened to add water and push air bubble back to 0
3. set a timer and set the time measured
4. distance of the air bubble is recorded
5. can be repeated in different environments