Photosynthesis Review

What is What is Photosynthesis? Photosynthesis?

• Is a process by which Is a process by which green plants and other green plants and other organisms synthesize organisms synthesize their own food using their own food using carbon dioxidecarbon dioxide,,water water andand light.light.

• Are organisms that are capable of synthesizing its own food from inorganic substances(carbon dioxide, iron, sulfur) using light.

• Some examples are:1.Green plants 2.Algae3.certain bacteria

PhotoautotrophAutotrophs such as plants, bacteria and algae that depend on photosynthesis for both energy and carbon compounds.

Chemoautotroph Bacteria that obtain its

carbon from photosynthesis and obtains its energy from inorganic substances such as iron, sulfur or other minerals.

Chemical Reaction Chemical Reaction Chemical Reaction Chemical Reaction 6CO6CO2 2 + 6H+ 6H22O O light light >> C C66HH1212OO66 + 6O + 6O22

Carbon Water Glucose Oxygen

Dioxide (sugar)

Chlorophyll a light absorbing pigment that gives plants their green color and converts the energy of sunlight to food in the process known as photosynthesis.

Photosynthesis consists of 2 parts: Light reaction and Calvin Cycle

• A. True• B. False

Photosynthesis Photosynthesis

• The Light

Reaction

• The Calvin Cycle

Calvin Cycle

The Calvin Cycle gets ATP and NADPH from the Light Reaction.

• A. True• B. False

The real product of the Calvin Cycle is PGAL.• A. True• B. False

All autotrophs get energy to power cell activities from

a. other organisms.b.nonliving sources.c. photoheterotrophs.d.Xrays.

We rely on photosynthesis for:a. running our automobiles.b.heating our homes.c. food.d.all of the above.

The light reactions of photosynthesis end ina. CO2.

b.H2O.

c. PSI and PSII.d.NADPH.

The compounds ATP and NADPHa. are not particularly stable.b.contain too much carbon.c. are produced by the Calvin cycle.d.attract electrons.

Chemoautotrophs obtain energy froma. fungi and bacteria.b.oxidizing inorganic substances.c. carbon dioxide.d.sunlight.

During photosynthesis, the oxygen atoms in water molecules

a. help form carbohydrates.b.help form both carbohydrates and water.c. end up as oxygen gas.d.act as hydrogen-acceptor molecules.

Sugar phosphates are produced in the Calvin cycle. These compounds are used by the plant to make

a. lipids.b.amino acids.c. proteins.d.all of the above.

Radiant energy is absorbed by chlorophyll.a. occurs during the light reactionsb.occurs during the Calvin cyclec. occurs during both phasesd.does not occur during either phase

Photosynthesis converts ____ into ____.a. sugar, chemical energy and waterb.hydrolyzed carbohydrates, usable energyc. sulfur compounds, carbohydratesd.visible light, chemical energy

Chlorophyll absorbs light in _____ range(s) of wavelengths.

a. the violet/blue and orange/red b.all visible c. the black/white and orange/yellowd.primarily the green

Where does the Calvin Cycle occur in the chloroplast?

a. thylakoid membraneb.stromac. granad.granum

________________ carries water and dissolved minerals from the roots to the leaves.

a. Pipesb.Xylemc. Phloemd.Cord

__________________ carries the food made in the leaves to the rest of the plant.

a. Pipesb.Xylemc. Phloemd.Cord

What does RuBP stand for?a. Phosphoslyeric acid b.Ribulose bisphosphatec. Ribo biphosphated.Ribose bipalladium

In the Light Reaction Chlorophyll traps light and splits _______________.

a. waterb.carbon dioxidec. glucosed.PGAL

What is the function of ATP in photosynthesis?a. transports H ionsb.compound used to store energyc. compound used to store fatsd.transports NADPH

What is the function of the stomates in leaves?a. protectionb.shapec. light absorptiond.diffusion of gases