Rate of photosynthesis and limiting factors
10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-LS1-5 · England: KS4 Combined Science: Photosynthesis
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Question 1
Bubbles per minute from pondweed at different lamp distances: 10 cm: 50 20 cm: 12.5 30 cm: 5.6 40 cm: 3.1 50 cm: 2 How many fewer bubbles per minute were counted at 20 cm than at 10 cm?
Answer
Question 2
Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 10 cm to 20 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.
Answer
Question 3
Which of these is NOT a limiting factor for photosynthesis?
- A. carbon dioxide concentration
- B. temperature
- C. light intensity
- D. oxygen concentration
Question 4
Bubbles per minute from pondweed at different lamp distances: 10 cm: 51 20 cm: 12.8 30 cm: 5.7 40 cm: 3.2 50 cm: 2 How many fewer bubbles per minute were counted at 20 cm than at 10 cm?
Answer
Question 5
Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 25 cm to 100 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.
Answer
Question 6
Farmers add paraffin heaters to greenhouses in winter. Which two factors does this increase?
- A. light and water
- B. light and oxygen
- C. water and oxygen
- D. temperature and carbon dioxide
Question 7
Bubbles per minute from pondweed at different lamp distances: 10 cm: 59 20 cm: 14.8 30 cm: 6.6 40 cm: 3.7 50 cm: 2.4 How many fewer bubbles per minute were counted at 50 cm than at 40 cm?
Answer
Question 8
Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 25 cm to 100 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.
Answer
Question 9
Farmers add paraffin heaters to greenhouses in winter. Which two factors does this increase?
- A. water and oxygen
- B. light and water
- C. temperature and carbon dioxide
- D. light and oxygen
Question 10
Bubbles per minute from pondweed at different lamp distances: 10 cm: 67 20 cm: 16.8 30 cm: 7.4 40 cm: 4.2 50 cm: 2.7 How many fewer bubbles per minute were counted at 30 cm than at 20 cm?
Answer
Question 11
Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 25 cm to 100 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.
Answer
Question 12
On a graph, the rate rises with light intensity and then levels off. Why does it level off?
- A. The plant has died
- B. Oxygen runs out
- C. Another factor, such as CO₂ or temperature, is now limiting
- D. Light stops reaching the leaf
Question 13
Bubbles per minute from pondweed at different lamp distances: 10 cm: 61 20 cm: 15.3 30 cm: 6.8 40 cm: 3.8 50 cm: 2.4 How many fewer bubbles per minute were counted at 30 cm than at 20 cm?
Answer
Question 14
Light intensity is inversely proportional to the square of the distance from the lamp. A lamp is moved from 25 cm to 75 cm from a plant. The new light intensity is what fraction of the old one? Give a decimal.
Answer
Question 15
On a graph, the rate rises with light intensity and then levels off. Why does it level off?
- A. The plant has died
- B. Another factor, such as CO₂ or temperature, is now limiting
- C. Light stops reaching the leaf
- D. Oxygen runs out
Question 16
Bubbles per minute from pondweed at different lamp distances: 10 cm: 51 20 cm: 12.8 30 cm: 5.7 40 cm: 3.2 50 cm: 2 How many fewer bubbles per minute were counted at 40 cm than at 30 cm?
Answer
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