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Photosynthesis Review Worksheet

Part A -Match the terms below with the correct description

Chlorophyll
Chloroplast
Blue and red light waves
Green light waves
Electron transport chain
Grana
Light reaction
Dark reaction
Photosynthesis
Stroma
Thylakoid /
  1. The BLUE AND RED LIGHT WAVESare absorbed by plants to fuel the process of photosynthesis.
  1. The energy-capturing portion of photosynthesis that takes place in thylakoid membranes of chloroplasts is the LIGHT REACTIONand it cannot proceed without solar energy, it produces ATP and NADPH
  1. The green pigment CHLOROPHYLL absorbs solar energy and is important in photosynthesis
  1. A large, central compartment in a chloroplast that is fluid filled is called the STROMA This contains enzymes that are involved in the dark reaction.
  1. The THYLAKOID is a membrane-bounded organelle where photosynthesis takes place
  1. It is within the CHLOROPLAST where solar energy is absorbed and high-energy electrons are generated to move onto the dark reaction.; contains a pigment complex and an electron acceptor
  1. The ELECTRON TRANSPORT CHAINallows the passage of electrons along a series of carrier molecules form a higher to a lower energy level; the energy released is used for the synthesis of ATP.
  1. PHOTOSYNTHESIS is the process which occurs within chloroplasts whereby chlorophyll traps solar energy and carbon dioxide is reduced to make carbohydrates.
  1. A leaf appears to be green because the GREEN LIGHT WAVESare reflected and thus not used to energize the process of photosynthesis.
  1. The second step in the process of photosynthesis is theDARK REACTION it is in the stroma of chloroplasts that this reaction occurs. It does not directly require solar energy; it uses the products of the light dependant reactions to reduce carbon dioxide to a carbohydrate
  1. A series of thylakoids stacked on top of one another working together are called GRANA

Part B - Answer the following questions. Use scientific thoughts and complete sentences.

1. Explain the difference between autotrophs and heterotrophs. Give two examples of each.

AUTOTROPHS – ORGANISMS THAT PRODUCE THEIR OWN FOOD. PLANTS, SOME BACTERIA

HETEROTROPHS – ORGANISMS THAT CONSUME THEIR OWN FOOD. ANY ANIMAL, FUNGI

2. Below draw a molecule of ATP. Label: adenine, 5 carbon sugar ribose, the phosphate groups, and the chemical bond holding the phosphates together.

3. In the diagram above place an X where a bond would be broken to release energy. What do we call the resulting molecule?

ATP LOSES A P AND BECOMES ADP

4. Below draw a diagram of chloroplast and label the following: chloroplast membrane, thylakoid, granum (grana), stroma, thylakoid membrane, and the location of pigments.

PLURAL OF GRANUM IS GRANA

PIGMENT (CHLOROPHYLL) IS IN THYLAKOID MEMBRANES

5. Explain why chloroplasts are green.

CHLOROPHYL IS THE GREEN PIGMENT IN GRANA ARE GREEN BECAUSE THEY REFLECT GREEN LIGHT.

6. What is NADPH? What is the difference between NADP and NADPH? How does NADP turn into NADPH?

AN ELECTRON CARRIER IN PHOTOSYNTHESIS . NADP+ IS NOT CARRYING AN ENERGIZED ELECTRON, NADPH IS.

NADP+ BECOMES NADPH WHEN IT ACCEPTS AN ENERGIZED ELECTRON FROM THE CHLOROPHYL PIGMENT WHEN IT’S EXPOSED TO SUNLIGHT.

7. Write the chemical equation for the process of photosynthesis.

6 CO2 + 6 H20 + SUNLIGHT ------ C6H1206 + 6 H20

8. What are the reactants and products of Light Dependent Reactions? Where in the chloroplast do they occur?

Reactants: WATER, SUNLIGHT

Products: OXYGEN

Location: THYLAKOID MEMBRANES (GRANUM/GRANA)

9. What are the reactants and products of Light-Independent/Dark Reactions/Calvin Cycle? Where in the chloroplast do they occur?

Reactants: CARBON DIOXIDE

Products: GLUCOSE

Location: STROMA

10. What is the Light-Independent or Dark Reaction often called?

CALVIN CYCLE

11.When a water molecule is split, what is it split into? Where do all the resulting components end up?

OXYGEN, ATP AND NADPH. AS GAS OR IN ELECTRON CARRIERS.

12. Explain how temperature, intensity of light and water affect the rates of photosynthesis?

LIGHT INCREASES TEMPERATURE AND WATER ALL CONTRIBUTE TO INCREASE RATES OF PHOTOSYNTHESIS BECAUSE THEY ARE THE REACTANTS OF THE LIGHT REACTION. INCREASE THE AMOUNT OF REACTANTS AND THE RATE OF REACTION INCREASES.

13.Why is there a need to go on with Light – Independent reactions? Why not stop with the Light –Dependant Reactions since ATP and NADPH are energy carrying molecules?

BECAUSE IN THE CALVIN CYCLE THE ENERGY GATHERED IN ATP AND NADPH ARE USED TO TRAP CARBON FROM CARBON DIOXIDE INTO A GLUCOSE MOLECULE.

12. Label the diagram below to show where the light reaction takes place, where the dark reaction takes place, what happens to ATP after the dark cycle and what carries energy into the dark reaction.

Label the diagram below

GRANUM

STROMA

THYLAKOID MEMBRANE