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How can we show that plants use carbon dioxide in photosynthesis? How can we show that plants use carbon dioxide in photosynthesis?

How can we show that plants use carbon dioxide in photosynthesis? - PowerPoint Presentation

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Uploaded On 2019-02-04

How can we show that plants use carbon dioxide in photosynthesis? - PPT Presentation

Hydrogencarbonate Indicator Increasing CO 2 in indicator Decreasing CO 2 in indicator Atmospheric CO 2 level Hydrogencarbonate indicator is used to measure carbon dioxide levels in aquatic systems ID: 750187

containers indicator dioxide carbon indicator containers carbon dioxide place pondweed light container colour red shading plant noticeable change transparent

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Presentation Transcript

Slide1

How can we show that plants use carbon dioxide in photosynthesis?Slide2

Hydrogencarbonate Indicator

Increasing CO

2

in indicator

Decreasing CO

2 in indicator

Atmospheric CO2 level

Hydrogencarbonate indicator is used to measure carbon dioxide levels in aquatic systems.

It is red in equilibrium with atmospheric air.

It becomes more orange/yellow with increased carbon dioxide levels.

It changes from red through magenta to deep purple as carbon dioxide is removed.Slide3

Method

Take four transparent containers that can be easily sealed.

Rinse the containers with a small amount of indicator.

Add a standard volume of indicator to each container and in three of the containers, place equal length sprigs of pondweed e.g.

CabombaSeal all the containers. Place one with pondweed into a dark cupboard.Take another containing pondweed and cover it with shading. Place the three remaining containers (including the one with no plant in), the same distance from a bright white light source and leave until there is a noticeable change in colour

.Make sure the lamp will not cause your pond water to overheat. You might want to place a transparent screen between the light and the plant, or a flat sided container of cold water to absorb the heat but none of the light.When there is a noticeable change in colour in the indicator, remove the shading and compare the colours in the four containers to those in the picture.Slide4

Table of results

Container

Pondweed

present

% of full light

Colour of indicator

Has the carbon dioxide in the indicator increased or decreased?

What does this tell you ?

1

2

3

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