TRANSPIRATION and TRANSLOCATION

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  • Created by: Lizelledp
  • Created on: 05-04-21 16:03
What is Transpiration?
When the water on the mesophyll cells
evaporate into the humid
interconnecting air spaces and then
diffuse out of the leaf and into the
atmosphere through the stomata.
1 of 14
Explain how the water evaporates
through transpiration in plants?
the energetic water molecules brake
free and escape into the air spaces
between the mesophyll cells.
The interconnecting air spaces
creates a large surface area
which ensures a high rate of
evaporation.
2 of 14
Explain how water diffuses
through transpiration in plants?
the air spaces are very humid, they
have a high concentration of
water vapour which diffuses through
the stomata to the lower concentration
outside the leaf.
3 of 14
What happens during the day with
the stomata?
it stays open and water vapoour
escapes quickly
4 of 14
What happens during the night with the
stomata?
the stomate are closed and no
water evaporates
5 of 14
What influence the plants transpiration
rate?
Temperature
Humidity
6 of 14
What happens to the transpiration
rate when the temperature is
high?
the transpiration rate
goes faster.
7 of 14
What happens to the transpiration
rate when the humidity is
high?
The transpiration rate
will go down
8 of 14
Explain the effects of variation of
temperature on the transpiration
rate?
when it is warm, the air outside a leaf
can hold more water vapour
than when the air is cold.
This increases the rate of diffusion
which will increase the rate of
transpiration.
9 of 14
Explain the effects of variation of
humidity on the transpiration
rate?
when the atmosphere is humid, the
concentration of water vapour
inside the plant is almost equal to the
concentration outside.
This slows down the rate of diffusion
and the rate of transpiration will
slow down.
10 of 14
What is wilting?
When a plant is not receiving
enough water.
11 of 14
How does wilting occurs?
the xyelm vessels stop filling the
mesophyll cells with water so
the cells start absorbing water
from the vacuoles of each other
12 of 14
Why does wilting occurs?
when a cell's vacuole empties
it looses its turgor and become
flaccid.
Once many mesophyll cells are
flaccid it will be noticeable in
a plant's appearance as the leaves
and stem will droop.
13 of 14
What is Translocation?
when sucrose and amino acids are
moved from where they are
made/supplied to where they are
used/stored.
14 of 14

Other cards in this set

Card 2

Front

Explain how the water evaporates
through transpiration in plants?

Back

the energetic water molecules brake
free and escape into the air spaces
between the mesophyll cells.
The interconnecting air spaces
creates a large surface area
which ensures a high rate of
evaporation.

Card 3

Front

Explain how water diffuses
through transpiration in plants?

Back

Preview of the front of card 3

Card 4

Front

What happens during the day with
the stomata?

Back

Preview of the front of card 4

Card 5

Front

What happens during the night with the
stomata?

Back

Preview of the front of card 5
View more cards

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