Worksheet: Limiting Factors of Photosynthesis

In this worksheet, we will practice describing and explaining the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis.

Q1:

Why will an increase in carbon dioxide concentration result in an increase in the rate of photosynthesis?

  • ACarbon dioxide provides the energy needed for photosynthesis.
  • BCarbon dioxide is a reactant and a raw material needed for photosynthesis.
  • CCarbon dioxide acts as a catalyst to speed up the rate of reaction.
  • DCarbon dioxide is a product of photosynthesis.

Q2:

Complete the following statements with “increase,” “decrease,” or “have no effect on.”

An increase in the amount of chlorophyll in the leaf will the rate of photosynthesis.

  • Aincrease
  • Bdecrease
  • Chave no effect on

A decrease in carbon dioxide availability will the rate of photosynthesis.

  • Adecrease
  • Bincrease
  • Chave no effect on

Q3:

Fill in the blanks: Photosynthesis happens faster at a temperature because the molecules that carry out the reaction have more energy.

  • Ahigher, light
  • Bhigher, kinetic
  • Clower, heat
  • Dlower, kinetic

Q4:

Which of the following is not a major limiting factor for the rate of photosynthesis?

  • ACarbon dioxide concentration
  • BTemperature
  • CLight intensity
  • DOxygen concentration

Q5:

Why will a decrease in light intensity result in a decrease in the rate of photosynthesis?

  • AA decrease in light intensity means a decrease in the energy required for photosynthesis to take place.
  • BA decrease in light intensity means the enzymes that control photosynthesis may denature.
  • CA decrease in light intensity means an increase in the energy required for photosynthesis to take place.
  • DA decrease in light intensity means a decrease in the available reactants needed for photosynthesis.

Q6:

The graph provided shows the correlation between carbon dioxide concentration and the rate of photosynthesis. Which of the following best describes this correlation?

  • AAs CO2 concentration increases, the rate of photosynthesis increases continually.
  • BAs CO2 concentration increases, the rate of photosynthesis increases until it plateaus.
  • CAs CO2 concentration increases, the rate of photosynthesis decreases until it plateaus.

Q7:

When investigating biological reactions, which of the following best explains the term “limiting factor”?

  • AA factor that must be removed before a reaction can take place
  • BA factor that must have its impact limited before a reaction can take place
  • CA factor that speeds up the rate of reaction without being used up
  • DA factor that restricts the rate of a reaction

Q8:

The graph shows the relationship between temperature and the rate of photosynthesis. What can we assume has happened after 50C?

  • AThe water supplying the plant has been used up, so photosynthesis cannot take place.
  • BThe enzymes needed for photosynthesis have denatured.
  • CAnother factor, such as light intensity, is limiting the rate of reaction.

Q9:

The graph provided shows the rate of photosynthesis as light intensity changes at two given CO2 concentrations.

Which of the following statements is correct about the graph?

  • AAt both concentrations of CO2, the rate of photosynthesis increases as temperature increases continually.
  • BThe rate of photosynthesis is consistently higher at 0.4% carbon dioxide concentration.
  • CThe rate of photosynthesis is consistently higher at 0.2% carbon dioxide concentration.

What factor could be increased to allow the rate of photosynthesis to keep increasing past 50 lux?

  • AOxygen concentration
  • BLight intensity
  • CTemperature

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