Question

The rate of photosynthesis changes during the day time ? Explain the factors that effect the rate of photosynthesis in the early morning?​

Answer 1

Answer:

There are several ways of measuring the rate of photosynthesis in the laboratory. These include:

the rate of oxygen output

the rate of carbon dioxide uptake

the rate of carbohydrate (glucose) production

These are not perfect methods as the plant will also be respiring, which will use up some oxygen and carbohydrate and increase carbon dioxide output.

Several factors can affect the rate of photosynthesis:

light intensity

carbon dioxide concentration

temperature

The amount of chlorophyll also affects the rate of photosynthesis:

plants in lighting conditions unfavourable for photosynthesis synthesise more chlorophyll, to absorb the light required

the effects of some plant diseases affect the amount of chlorophyll, and therefore the ability of a plant to photosynthesise, such as downy mildew in grape vines

Explanation:

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Answer 2

→  The main factors affecting rate of photosynthesis are light intensity, carbon dioxide concentration  and temperature.

• At low light intensities, as light intensity  increases, the rate of the light-dependent  reaction, and therefore photosynthesis  generally, increases.

• An increase in the carbon dioxide  concentration increases the rate at which  carbon is incorporated into carbohydrate  in the light-independent reaction, and so  the rate of photosynthesis generally  increases.

• As the  enzymes approach their optimum  temperatures the overall rate increases. It  approximately doubles for every 10 °C  increase in temperature

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