Mastering Photosynthesis: Important Concepts and Processes Revealed!
Dive deep into the world of photosynthesis and enhance your knowledge with this comprehensive revision guide. Explore key questions and answers related to how plants make food, the energy sources involved, the role of chlorophyll, required raw materials, end products, and even how to test for the presence of starch using iodine solution. Uncover the wonders of this essential biological process through engaging visuals and informative content.
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Presentation Transcript
Photosynthesis HOT SEAT Revision
QUESTION What is the name of the process where plants make food?
ANSWER photosynthesis
QUESTION What kind of energy does the plant use during photosynthesis?
ANSWER Light
QUESTION What is the name of the chemical that traps the light in the leaf?
ANSWER Chlorophyll
QUESTION What colour is the chemical that traps light?
ANSWER Green
QUESTION What are the raw materials needed for photosynthesis?
ANSWER Water and carbon dioxide
QUESTION What are the products of photosynthesis?
ANSWER Starch (food) and oxygen
QUESTION What chemical is used to test if starch is present?
ANSWER Iodine solution
QUESTION What colour is iodine solution?
ANSWER Orange/red
QUESTION What colour does iodine solution change to if starch is present?
ANSWER Blue/back
QUESTION When testing a leaf for starch, why we must boil the leaf in water first?
ANSWER To soften the leaf and kill the cells.
QUESTION When testing a leaf for starch, why we must boil the leaf in ethanol (alcohol)?
ANSWER To remove the chlorophyll (green colour)
QUESTION When testing a leaf for starch, why must we turn off the Bunsen burner before using ethanol?
ANSWER Ethanol is highly flammable (catches fire easily).
QUESTION Describe an experiment to PROVE plants need light to make food.
ANSWER Leave a plant in the dark for two days then test for starch
QUESTION Describe an experiment to PROVE plants need carbon dioxide to make food.
ANSWER Put the plant in a place where the carbon dioxide has been removed for 2 days and then test for starch.
QUESTION When comparing plants with or without light what factors must be kept the same?
ANSWER Size and type of plant.
QUESTION What is a variegated leaf?
ANSWER A leaf with green and white parts.
QUESTION What happens to a variegated leaf when tested for starch?
ANSWER Green parts turn black, white parts turn orange
QUESTION What does testing a variegated leaf for starch prove?
ANSWER That only the green parts of a leaf can make food (starch).
QUESTION Elodea (pond weed) is an underwater plant how do we know it s photosynthesising?
ANSWER You can see bubbles appear from it.
QUESTION How do we know the bubbles from the elodea are oxygen?
ANSWER They relight a glowing splint.
QUESTION How can we use elodea to measure the rate of photosynthesis?
ANSWER Count the number of bubbles given off in 1 minute.
QUESTION How can we speed up the rate of photosynthesis?
ANSWER Increase the carbon dioxide Or Increase the light intensity
QUESTION How do we know the rate of photosynthesis is increasing?
ANSWER Bubbles appear quicker.
QUESTION What is the word equation for photosynthesis?
ANSWER Water Food light + + chlorophyll Carbon dioxide Oxygen
QUESTION The food made is called sugar what does the plant change it into?
