Transport In Plants Flashcards Preview

Biology module 4 > Transport In Plants > Flashcards

Flashcards in Transport In Plants Deck (14):
1

What is the transpiration rate affected by?

Light intensity
Temperature
Air movement
Humidity

2

What must healthy plants do?

Balance water loss with water uptake

3

What do both xylem and phloem form?

Continuous systems in leaves, stems and roots

4

Relate xylem to its function

Xylem - transpiration - movement of water and minerals from the roots to the shoot and leaves

5

Relate phloem to its function

Phloem - translocation- movement of food substances (sugars) up and down stems to growing and storage tissues

6

Describe the structure of xylem vessels

Thick strengthened cellulose cell wall with a hollow lumen (dead cells)

7

Describe the structure of phloem

Columns of living cells

8

What is transpiration?

The evaporation and diffusion of water from inside leaves

9

Describe how transpiration causes water to be moved up xylem vessels

- water evaporates from the internal leaf cells through the stomata
- water passes by osmosis from the xylem vessels to leaf cells, which pulls the entire thread of water in that vessel upwards by a small amount
- water enters the xylem from root tissue to replace water which has moved upwards
- water enters root hair cells by osmosis to replace water which has entered the xylem

10

Explain how the structure of a leaf is adapted to reduce excessive water loss

- waxy cuticle
- small number of stomata on upper surface

11

What does transpiration provide plants with water for?

Cooling
Photosynthesis
Support
Movement of minerals

12

Explain how the cellular structure of a leaf is adapted to reduce water loss?

- changes in guard cell turgidity

13

Explain why transpiration is increased by:
- increase in light intensity
- increase in temperature
- increase in air movement
- decrease in humidity

- more light increase rate of photosynthesis so increases transpiration
- rate of photosynthesis increase as temperature increases so increases transpiration
- transpiration increase as the movement of air increases
- decreased humidity increases transpiration as there would be less water vapour in the air

14

Describe how water travels through a plant

- absorption from soil through root hairs
- transport through the plant, up the stem to the leaves
- evaporation from the leaves (transpiration)