Limiting Factors Affect The Rate Of Plants Photosynthesis (1)

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Limiting Factors

affect the Rate

of Plant’s Photosynthesis

Group 1

Outline of the Presentation

• Concentration of Carbon Dioxide

III. • Conclusion

I Introduction

1 Photosynthesis process of plants

Light

Advancing Chemical Sciences

2 Limiting Factors

*Rate of photosynthesis: describe how much sugar and oxygen a plant can produce over time.

*The law of limiting factors states that:

At any point in time, one of other factors will be in low supply and limit the rate of photosynthesis Thus, the factor in lowest supply is called the limiting factor.

*Limiting factors that affects the rate of photosynthesis:

CO2 Concentration

Light Intensity Temperature

II Limiting factors affecting the rate

of plant’s photosynthesis

1 Light Intensity

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*Stoma (khí khổng): is a pore, found in the epidermis (biểu bì) of

leaves that is used to control gas exchange.

Chlorophyll

*Chlorophyll( chất diệp lục): a green pigment (sắc tố) found in chloroplasts (lạp lục), present in all green plants.

*Chloroplast ( lạp lục): tiny factories inside the cells of plants It takes the energy from the sunlight and use it to make plant food

iweb.langara.bc.ca

eventhough light intensity

increases, rate of photosynthesis remains constant Light intensity

is no longer a limiting factor.

25 0 C

2 Temperature

.

* Temperature speeds up all chemical reactions

* The temperature increases => the enzymes get more energy and the rate of photosynthesis increases.

* Enzyme: protein that act as catalysts (chất xúc tác) within cells.

*250C is the optimal temperature.

*At that temperature, the enzyme is most efficient.

25 0 C

*The temperature is higher than 250C => the rate

of photosynthesis falls rapidly.

*The enzymes are denatured.

*Denatured (biến dạng): change the shape

25 0 C

Why are the enzymes

denatured in high

temperature

*Enzymes and denatured process

.

*Substrate (chất nền): In this case, the two substrates for

*Denaturing enzymes

The enzyme is denatured at 450C.

The rate of photosynthesis stops entirely

3 Concentration of CO2

0.03-0.04%

http://www.eschooltoday.com/photosynthesis/carbon-dioxide-for-photosynthesis.html

*CO2 diffusion process

*Diffusion (khuếch tán): the tendency of molecules to spread out in available space.

%20limiting%20factors.pdf

http://www.passmyexams.co.uk/GCSE/biology/carbondioxide-affecting-rate-of-photosynthesis.html

Certain C02concentration

=> Photosynthesis stays

constant

PR: photosynthesis rate

0.03-0.04%

III Conclusion

- Photosynthesis is the one of the most important

processes which supplies oxygen and gives off carbon

dioxide to our life.

- Photosynthesis process is directly dependent on the supply of temperature, light intensity, and

concentration of carbon dioxide Limiting any one of

these factors can limit the rate of photosynthesis.

- With knowledge of limiting factors, it is possible to control the growing conditions for crop plants This enables faster growing of plants and the increase of their quality and yield.

www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pr e_2011/plants

factors-and-uses

www.nuffieldfoundation.org/practical-biology/investigati ng-factors-affecting-rate-photosynthesis

science.opposingviews.com/effect-temperature-rate-phot osynthesis-19595

www.stem.org.uk/elibrary/resource/34936/rate-photosynth esis-limiting-factors

www.biologydiscussion.com/photosynthesis/blackmans-law -of-limiting-factors-and-his-criticism-photosynthesis/

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Thank you

for your attention !