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THE FACTORS AFFECTING

THE RATE OFPHOTOSYNTHESIS

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THE FACTORS AFFECTING THERATE OF PHOTOSYNTHESIS

Factors

Light

intensity

Temperature

Concentration

of CO2

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1. Light intensity

Light is essential during the light reaction of

photosynthesis.

Plants shows various adaptations to obtain

the maximum amount of light.

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1. Light intensity

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1. Light intensity

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1. Light intensity

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1. Light intensity

Rate

ofphotosynt

hesis

Light intensity

Graph II

Graph IP Q

0.13% CO2 at 30C

0.03% CO2 at 30C

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2. Concentration of CO2

Carbon dioxide is required in dark reaction as

the raw materials used in the synthesis of

glucose.

The concentration of carbon dioxide in the

atmosphere varies between 0.03% to 0.04%.

In places where the density of plants is high,

competition of CO2 arises and will affect the

rate of photosynthesis.

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2. Concentration of CO2

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2. Concentration of CO2

Rate

ofphotosynthesis

CO2 concentration

30C at high light intensity

30C at low light intensity

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3. Temperature

The dark reaction of photosynthesis is

catalyzed by enzymes.

Changes in temperature will affect the rate of

photosynthesis.

An increase of 10C in the surrounding will

double the rate of photosynthesis.

When the temperature is too high, the

photosynthetic enzymes will destroy.

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3. Temperature

Q: What happens to photosynthesis

process?????

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3. Temperature

Rate

ofphotosynthesis

Temperature

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The difference in the rate of

photosynthesis in plants

throughout the day

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Q1: Does the rate of photosynthesis in plants

constant throughout the day????

Q2: What factors that contribute to this

differences?????

Q3: What happens to rate of photosynthesis

during morning, midday, evening and night???

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Increasing the productivity of

crops based on the factorsaffecting the rate of

photosynthesis

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Q1: What happens in countries with 4

seasons????

Q2: How to overcome this problem?????

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Greenhouse

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A caring attitude towards plants

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Importance of photosynthesis

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Technology used in foodproduction

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Methods used to improve the quality and

quantity of food production

Direct seedling

Hydroponics

Aeroponics

Breeding of plants and animals

Tissue culture

Genetic engineering

Soil management

Biological control

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Technological development infood processing

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Food processing

The necessity of food processing.

Food processing methods:

Cooking

Treating food with salt, sugar and vinegar

Fermentation

Drying

Pasteurisation

Canning

Refrigeration