The Rate of Photosynthesis Flashcards
Why does not enough light slows down the rate of photosynthesis?
Because light provides the energy needed for photosynthesis.
Why does the rate of photosynthesis increases steadily as the light level but only up to a certain point?
Because it will be either the temperature or the CO₂ level which is now the limiting factor, not light.
How could someone change the light intensity in a lab?
By moving a lamp closer to or further away from the plant.
Why too little of carbon dioxide slows down the rate of photosynthesis?
Because Co₂ (carbon dioxide) is one of the raw materials needed for photosynthesis.
Why does the amount of Co₂ increases rate of photosynthesis up to a point?
When the rate of photosynthesis no longer increases when the amount of CO₂ continues to increase, it means that the CO₂ is no longer the limiting factor. So it must be the light intensity or the temperature.
What happens if the plants get too hit?
The enzymes the plant need for photosynthesis and its other reactions will be damaged.
How and why the temperature is/can be the limiting factor of photosynthesis?
If the temeperature is the limiting factor of photosynthesis it’s because it’s too low. The enzymes needed for photosynthesis work more slowly at low temperatures.
What has to be the right temperature to photosythesis?
The temperature has to be about 26℃. By 45⁰C enzymes are destroyed/demature.
What is the canadian poundweed used for?
It can be used to measure the effevt of light intensity on the rate of photosynthesis.
What corresponds to the rate at which a poundweed is photosynthesising?
The rate at which the poundweed produces oxygen (bubbles) - the faster the rate of oxygen production, the faster the rate of photosynthesis.
What is the equation for the inverse square law and what does it means?
Light intensity = ⅟d² (distance). It means that light intensity decreases in portion to the square of the distance.
What is a greenhouse used for?
It is the most common way to artificially create the ideal environment for plants.
How does a farmer make sure that the temperature doesn’t become limiting in a greenhouse?
Greenhouses help to trap the Sun’s heat and in winter a farmernor gardner might use a heater as well to keep the temprature at the ideal level. In summer it could get too hot, so they might use shads and ventilation to cool things down.
After the Sun goes down, how does the farmer provide light in a greenhouse?
Commercial farmers often supply with artificial lights so they can give the plants more quality of photosynthesis time.
How can farmers increase the level of carbon dioxide in the greenhouse?
By using a paraffin heather to heat the greenhouse. As paraffin burns, it makes carbon dioxide as a by-product.
