4.1 Photosynthesis

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Question 6
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An agricultural scientist investigated the rate of photosynthesis in spinach (Spinacia oleracea) cultivars grown in a hydroponic vertical farming facility under various light intensities. The experimental results collected were as follows:

  • At 0 a.u.0\text{ a.u.}0 a.u. light intensity, the rate of photosynthesis is 0 a.u.0\text{ a.u.}0 a.u.
  • At 15 a.u.15\text{ a.u.}15 a.u. light intensity, the rate of photosynthesis is 5 a.u.5\text{ a.u.}5 a.u.
  • At 30 a.u.30\text{ a.u.}30 a.u. light intensity, the rate of photosynthesis is 12 a.u.12\text{ a.u.}12 a.u.
  • At 45 a.u.45\text{ a.u.}45 a.u. light intensity, the rate of photosynthesis is 28 a.u.28\text{ a.u.}28 a.u.
  • At 60 a.u.60\text{ a.u.}60 a.u. light intensity, the rate of photosynthesis is 36 a.u.36\text{ a.u.}36 a.u.
  • At 75 a.u.75\text{ a.u.}75 a.u. light intensity, the rate of photosynthesis is 39 a.u.39\text{ a.u.}39 a.u.
  • At 90 a.u.90\text{ a.u.}90 a.u. light intensity, the rate of photosynthesis is 39 a.u.39\text{ a.u.}39 a.u.
  • At 105 a.u.105\text{ a.u.}105 a.u. light intensity, the rate of photosynthesis is 39 a.u.39\text{ a.u.}39 a.u.
a.

Which range of light intensities caused the rate of photosynthesis to change the most?

  • A: From 0 to 15 a.u.15\text{ a.u.}15 a.u.
  • B: From 15 to 30 a.u.30\text{ a.u.}30 a.u.
  • C: From 30 to 45 a.u.45\text{ a.u.}45 a.u.
  • D: From 45 to 60 a.u.60\text{ a.u.}60 a.u.
[1]
b.

Explain the change in the rate of photosynthesis when the light intensity increased from 0 to 60 a.u.60\text{ a.u.}60 a.u.

[2]
c.

A commercial grower decided not to use a supplemental light intensity higher than 75 a.u.75\text{ a.u.}75 a.u. to grow the spinach plants. Suggest two reasons for this decision.

[2]

4.1 Photosynthesis Questions

  1. GCSE
  2. /Biology
  3. /4.1 Photosynthesis