Transpiration and translocation Flashcards Preview

B2 topic 6: Plant structure and functions > Transpiration and translocation > Flashcards

Flashcards in Transpiration and translocation Deck (24)
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1

How does water enter plant roots?

osmosis

2

How do mineral ions enter plant roots?

active transport

3

What is the function of the xylem?

Transport water and mineral ions from roots to leaves

4

What is the function of phloem?

transport sucrose around the plant

5

Why do xylem cells have lignin in them?

To strengthen the cell

6

Are xylem cells living or dead?

Dead

7

Are phloem cells living or dead?

Dead

8

Which type of transport takes place in the xylem?

transpiration

9

Which type of transport takes place in the phloem?

translocation

10

What are stomata?

Pores/holes in the underside of the leaf

11

Why does a plant need stomata?

For gas exchange

12

Which cells control opening and closing of stomata?

Guard cells

13

How do guard cells control opening and closing of stomata?

When there is lots of water, water enters guard cells by osmosis and causes them to become plump and turgid. This opens the stomata. When there is less water, water leaves the guard cells by osmosis causing them to become thin and flaccid, closing the stomata

14

Does transpiration need energy?

No

15

Does translocation need energy

yes

16

How do phloem cells get energy for translocation?

Companion cells next to the phloem provide the energy.

17

What is transpiration?

movement of water from the roots of a plant up to the leaves where it evaporates through stomata.

18

Which factors can increase transpiration?

High temperature, low humidity, high air movement, high light intensity

19

Why does increasing temperature increase transpiration?

More water molecules evaporate from the leaf through the stomata. Rate of diffusion is increased

20

Why does decreasing humidity increase transpiration?

Makes a greater concentration gradient between the leaf and the air so diffusion is faster

21

Why does increasing air movement increase transpiration?

Maintains concentration gradient between leaf and air, increasing rate of diffusion

22

Why does increasing light intensity increase transpiration?

Rate of photosynthesis increases and stomata open for gas exchange, causing water to diffuse out.

23

Which piece of equipment can measure rate of transpiration?

potometer

24

How does a potometer work?

Potometer measures how much water a plant takes up, therefore how much is lost through transpiration