B8 Photosynthesis Flashcards

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1
Q

Where does photosynthesis occur?

A

chloroplasts in the leaves of a plant

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2
Q

What is the name of the green pigment in the leaves?

A

chlorophyll

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3
Q

What type of reaction is photosynthesis?

A

endothermic

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4
Q

What type of energy is used in photosynthesis?

A

light energy

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5
Q

Give the word equation for photosynthesis.

A

carbon dioxide + water -> glucose + oxygen

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6
Q

Give the balanced symbol equation for photosynthesis.

A

6CO2 + 6H2O -> C6H12O6 + 6O2

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7
Q

Define the term limiting factor.

A

anything that limits the rate of a reaction when it is in short supply

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8
Q

Give the limiting factors of photosynthesis.

A
  • temperature
  • carbon dioxide concentration
  • light intensity
  • amount of chlorophyll
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9
Q

Describe how light intensity affects the rate of photosynthesis.

A

increasing light intensity increases the rate of photosynthesis until another factor becomes limiting

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10
Q

Describe how carbon dioxide concentration affects the rate of photosynthesis.

A

increasing carbon dioxide concentration increases the rate of photosynthesis until another factor becomes limiting

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11
Q

Describe how temperature affects the rate of photosynthesis.

A

Increasing temperature increases the rate of photosynthesis as the reaction rate increases - at high temperatures enzymes are denatured so the rate of
photosynthesis quickly decreases

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12
Q

Give the equation for the inverse square law for light intensity.

A

light intensity = 1/distance squared

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13
Q

Why are limiting factors important in the economics of growing plants in greenhouses?

A

greenhouses need to produce the maximum rate of photosynthesis whilst making profit

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14
Q

How do plants use the glucose produced in photosynthesis?

A
  • respiration
  • convert it into insoluble starch for storage
  • fat or oil storage in seeds - lipids
  • produce cellulose to strengthen cell walls
  • produce amino acids for protein synthesis
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