Factors affecting photosynthesis

Open Ended

What is the word equation for photosynthesis?

Multiple Choice

What are the two reactants of photosynthesis?

• Oxygen and water

• Glucose and water

• Oxygen and carbon dioxide

• Carbon dioxide and water

Multiple Choice

What would happen if the rate of photosynthesis if the plant could not get enough CO2?

• Photosynthesis will be unaffected.

• Photosynthesis will not take place and plant growth will slow.

• The plant will thrive and grow faster.

• The leaves will become greener because more chloroplasts are made.

Multiple Choice

What happens to the rate of photosynthesis if the concentration of carbon dioxide continues to increase indefinitely?

• It increases forever.

• It decreases after a certain point.

• It stays the same after a certain point.

• It stops immediately.

Multiple Choice

Which of the following factors can limit the rate of photosynthesis?

• Carbon dioxide concentration

• Water availability

• Temperature

• All of the above

Multiple Choice

At what temperature will the rate of photosynthesis be the highest?

• 10°C for all plants

• Body temperature

• The optimum tempertature

• 100°C

Multiple Choice

What happens to plant enzymes when the temperature becomes too high?

• They fall apart and stop working.

• They work faster.

• They become more efficient.

• They freeze.

Multiple Choice

What is the optimum temperature for enzymes in plants?

• It is the temperature where enzymes work best.

• It is the lowest temperature at which enzymes can function.

• It is the temperature at which enzymes stop working.

• It is the highest temperature before enzymes fall apart.

Fill in the Blanks

The rate of photosynthesis is highest at the

temperature.

Multiple Choice

Which of the following is NOT a main factor affecting the rate of photosynthesis in plants?

• Carbon dioxide

• Temperature

• Light Intensity

• Soil pH

Multiple Choice

Why can enzymes not work in too low temperatures?

• The enzymes do not have enough energy

• The enzymes are all frozen

• The enzymes have too much energy

• The enzymes are unaffected by temperature

Multiple Select

Which of the following are ways to measure the rate of photosynthesis in plants?

• Counting oxygen bubbles produced by the plant

• Measuring the amount of starch using iodine

• Measuring the plant's height

• Timing how long it takes to collect a specific volume of gas

Multiple Choice

Sunlight provides what for plants?

• Water

• Joy

• Energy

• The green colour

Multiple Choice

Why can plants not perform photosynthesis at night?

• They are making flowers at night, so cannot do two tasks at once.

• It is too dark, so they do not have enough energy.

• It is too dark so they think they do not need it.

• They are asleep.