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Biology H-Photosynthesis
These questions are for study purposes only. The answers will not be collected.
1) Define photosynthesis.
2) Write a sentence that uses the words "photosynthesis and "autotroph" that shows the relationship between the two words.
3) Write a sentence that contains the words "carbon fixation" (or variation) and "photosynthesis" that shows the relationship between the two terms.
4) What is "food"? What are the two ways organisms acquire food? What 2 words describe organisms that use these two ways? What is stored in food?
5) Write the equation that shows how energy is stored in and released from ATP.
6) Write the general equation for photosynthesis.
7) Which pigment is necessary for Ps? What are the other pigments? Why might they be needed?
Give an example of a specific environment where the organisms need such an accessory pigment.
8) What would the enzyme ATP Synthetase do?
9) What name is given to the first part of Ps? Why is it given this name? What name is given to the second part of Ps? Why is it given this name?
10) When chlorophyll absorbs light, what happens to one of its electrons? What name is given to the series of steps that releases the energy from this electron?
11) The energy from these electrons is used to split what molecule? What is released into the environment?
12) The energy from the excited electrons is also used to push the hydrogen where? When the hydrogen returns, its energy is stored in what molecule? What is the name of this process?
13) What three carbon molecule is made during the synthetic phase of Ps? What is needed from the environment to do this? What two things are needed from the light phase to do this? What is most of this three carbon molecule made into? What are two other names for the synthetic phase?
14) What molecule is used to store (carry) hydrogen? What vitamin is this related to?
14a) A chloroplasts has stacks of thylakoid membranes called _____________. Around these is a colloid called the _____________ The reactions of the light phase occur in what part of the chloroplast? The reactions of the synthetic phase occur in what part of the chloroplast?
15) Why is chlorophyll green? Which color light is the worst for Ps? Explain the relationship between your two answers.
16) Why do insectivore plants eat flies if they can make food by Ps?
17) The C4 pathway and the CAM pathway both allow plants to photosynthesize without losing as much ____________ as the C3 pathway. Plants that use the CAM pathway have what disadvantage?
18) Ps has provided the earth with three things that are vital for your survival. What are they? (two of them are related)
19) What is the other method of fixing carbon besides Ps? What organisms use this? In what special environment do all the organisms depend on this process?