Photosynthesis

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Why is light necessary for photosynthesis?

Provides the energy needed to convert CO2 and water into glucose
What happens when light intensity increases?

Photosynthesis increases up to light saturation when a plateau is formed.
When may light be limited?

At dawn, dusk in a wood or on a dull but warm day.
What is compensation point ?
- The light intensity at which the rate of photosynthesis equals the rate of respiration.
- Ie no change in amount of food or oxygen/CO2 concentration of air surrounding the plant.
What is the optimum and minimum temperature of most plant enzymes?
- Optimum 25*
- Min 0*
- This is why plants grow better in warm climates and indoors
Why is plant growth slower in winter?

Lower light intensity
When may temperature be a limiting factor?

In early morning when bright but cool.
What is the biochemistry of photosynthesis broken into?
- Phase 1: light phase
- Phase 2: dark phase
What is light phase broken into?
- Cyclic
- Non-Cyclic
What is light phase?
- A photochemical reaction in which light energy is concerted into chemical energy in the grabs of the chloroplast.
- It is a fast biochemical reaction not affected by temperature.
Where does light phase occur?

In grana of the chloroplast
Which of the phases of photosynthesis is light independent?

Dark phase
What happens in the dark phase?
- Sugar is assembled (synthesised)
- Reactions are catalysed by enzymes (so effected by temperature)
Where does dark phase occur?

Occurs in stomata of the chloroplast
Which of the phases of photosynthesis is affected by temperature?

Dark phase. Reactions are catalysed by enzymes

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jacquelineglynn

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Photosynthesis

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Updated

2023-05-04T14:18:00Z

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