transpiration

Question 1

describe the journey of transpiration in a plant

Answer 1

the movement of water starting at the root hair cells through the roots, through the xylem, then through the leaves, then the stomata and then finally diffusing into the air

Question 2

how can transpiration be measure

Answer 2

using a potometer, using a balance

Question 3

what factors affect the rate of transpiration and how

Answer 3

• temperature (high temp = higher rate/speed of transpiration due to kinetic energy molecules. low temp = slower due to lack of kinetic energy in molecules)
• air movement (more air movement = removes water vapour from leaves surface so more water can be diffused. less air movement = the water vapour cannot be removed so less water can be diffused
• humidity (low humidity = greater diffusion gradient between inner and outer leaves. high humidity = lower diffusion gradient between inner and outer leaves)

Question 4

Which part of the plant is glucose produced in?

Answer 4

leaves

Question 5

What do we call the movement of cell sap (a mixture of sugar and water) up and down the plant?

Answer 5

translocation

Question 6

Phloem cells have _________ in their end walls to allow cell sap to pass along the phloem tube.

Answer 6

pores

Question 7

What does the xylem transport in a plant?

Answer 7

water and dissolved mineral ions

Question 8

How do root hair cells absorb water from the soil?

Answer 8

osmosis

Question 9

How do root hair cells absorb mineral ions from the soil?

Answer 9

active transport

Question 10

Which substance are xylem cells reinforced with to make them stronger?

Answer 10

lignin

Question 11

What is transpiration?

Answer 11

the evaporation of water from the leaves

Question 12

Why does the rate of transpiration increase if the light intensity is increased?

Answer 12

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