B8.2 - The Rate Of Photosynthesis (Finishedish) Flashcards

1
Q

What does a limiting factor for photosynthesis mean?

A

If something is a limiting factor it means that it is stopping photosynthesis from happening any faster

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2
Q

What are the limiting factors for photosynthesis?

A

Light intensity, CO2 concentration, temperature. Also chlorophyll

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3
Q

Why is light a limiting factor for photosynthesis?

A

Light provides the energy needed for photosynthesis to occur, so if there is not enough it will limit the rate of photosynthesis

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4
Q

As the light level is increased, how does the rate of photosynthesis change and why?

A

As the light level is raised, the rate of photosynthesis increases steadily up to a point. Beyond that it won’t make a difference (no longer increase) as co2 concentration or temperature has become the limiting factor

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5
Q

Why is co2 concentration a limiting factor for photosynthesis?

A

Co2 is a raw material needed for photosynthesis

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6
Q

How does the rate of photosynthesis change with increasing co2concentration?

A

As co2 concentration is increased then rate of photosynthesis will increase up to a point. But then the graph will flatten out as something else has become the limiting factor

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7
Q

Why is temperature a limiting factor for photosynthesis?

A

If the temperature is too low enzymes needed for photosynthesis will work more slowly. Too hot and the enzymes will be damaged and destroyed

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8
Q

At what temperature are enzymes for photosynthesis destroyed?

A

45 °C

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9
Q

What would vary the amount of chlorophyll in a plant?

A
  • disease
  • environmental stress such as lack of nutrients

These cause chloroplasts to be damaged or destroyed, or not enough chlorophyll is made so plants can’t absorb so much light

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10
Q

Distance

and light intensity are ___ to each other

A

Inversely proportional

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11
Q

What is the equation for light intensity?

A

Light intensity = 1/distance^2

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