factors that affect photosynthesis year 10

Increasing the amount of CO2 did what to the rate of photosynthesis?

• Increased

• Decreased

• Stayed the same

What are the most important factors that affect photosynthesis are

• Sunlight, water.

• temperature, light intensity, and the availability of water.

• co2, o2

What do most plants do under bright, hot conditions?

• They open the small openings in their leaves that normally admit carbon dioxide.

• They close the small openings in their leaves that normally admit carbon dioxide.

What colour of light is best absorbed by plants?

• Red and blue

• Green and Yellow

• Red and green

• Blue and green

• Only green

Red and blue light support the highest rates of photosynthesis because …

• Chlorophylls absorb light of these wavelengths more than other wavelengths.

• These are the only wavelengths that carotenoids cannot absorb.

• Light of these wavelengths have the highest energy in the visible spectrum.

• Light of these wavelengths activate the ATP synthase enzyme.

Which describes the transfer in this image?

• Carbon Dioxide from the air becomes glucose in the plant. The deer ingest the glucose and it becomes carbon.

• Carbon Dioxide from the air becomes water in the plant. The deer ingest the water and it becomes oxygen.

• Oxygen from the air becomes carbon dioxide in the plant. The deer ingest the carbon dioxide and it becomes carbon.

• Water from the air becomes Oxygen in the plant. The deer ingest the Water and it becomes Oxygen.

The following graph represents a plant in a sealed ecosystem where the levels of carbon dioxide (pink) and oxygen (green) can be observed.

Which of the following explains the changes to the gas levels over the 24 hour period?

• Carbon increases at night because there is less photosynthesis and more cellular respiration occuring in the plant

• Carbon increases during the day because there is less photosynthesis and more cellular respiration occuring in the plant

• Oxygen increases at night because there is more photosynthesis occuring in the dark

• cellular respiration does not occur in plants, so carbon dioxide decreases during the day in the light and never increases again.

Which of the following is responsible for plants mass?

• carbon dioxide in the atmosphere

• Oxygen in the atmosphere

• Water in the soil

• nutrients in the soil

Increasing the intensity of light had what effect on photosynthesis?

• It slowed it down

• It sped up

• It stayed the same

The ______ the temperature, the more photosynthesis can occur.

• higher

• lower