Introduction to Photosynthesis

Review

Plants “look green” because they _____________ green wavelengths of light.

absorb reflect

reflect

Photosynthesis in plants takes place inside which organelle?

chloroplasts

A _________________ is a molecule (like chlorophyll) that absorbs energy and is used by green plants to absorb sunlight.

Name the two types of chlorophyll

________________ & _________________

pigment

Chlorophyll a Chlorophyll b

Blue-violet and red wavelengths

Chlorophyll a

Chlorophyll b

Absorption of Light byChlorophyll a and Chlorophyll b

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Which wavelengths of light do chlorophyll a and chlorophyll b absorb best?

Chlorophyll b

Chlorophyll a

Absorption of Light byChlorophyll a and Chlorophyll b

They do not absorb green light.

Which wavelengthof light doesChlorophyll a and chlorophyll b Absorb the least?

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Set of chemical reactions in which the product of one reaction goes on to be the reactant in the next reaction

biochemical pathway

Use words to fill in the overall chemical reaction for photosynthesis.

___________+___________ __________ + __________

Carbon dioxide water Sugars oxygen

Land plants get the carbon dioxide needed for photosynthesis from the ____________(environment)atmosphere

Name the 2 sets of reactions that make up photosynthesis:

#1 is called ___________________.Light-Dependent Reactions#2 is called ________________.Calvin Cycle

(or Light-independent Reactions)

#1

#2

Photosynthesis

The main photosynthetic pigment ingreen plants = ___________________

chlorophyll

TRUE or FALSE

The Calvin cycle requires light.

FALSE: It is light INDEPENDENT

Light-Dependent Reactions break apart ________ and give off _______ gas.water oxygen

______________ areplant pigments thatare orange or yellowinstead of green

Carotenoids

http://www.rnzih.org.nz/images/gardenimages/carrots_d.jpg

Molecules that interact in a chemical reaction that are written on the left side of a chemical equation are called ________________reactants

Reactions of photosynthesis that use light energy to produce ATP and NADPH

Light-dependent reactions

Pigments that are yellow or orange not green

Clusters of light collectingproteins found in the thylakoidMembrane

carotenoids

photosystems

Process by which plants and some other organisms use sunlight to convert water and carbon dioxide (CO2) into oxygen (O2) and high energy carbohydrates

PHOTOSYNTHESIS

6 carbon sugar molecule that isthe main product of photosynthesis

and is used as the fuel burned by cells

glucose

Negatively charged particle found circling the nucleus of an atom

electron

Cell organelle containing thylakoid stacks where photosynthesis happens

In which part of photosynthesis is oxygen produced?

chloroplast

Light-dependent reactions

Molecules that are produced during a chemical reaction that are written on the right side of a chemical equation

products

Which gas that we need is given offduring photosynthesis?

oxygen

Label reactants and products for photosynthesis:

#1 = ___________________#2 = ___________________#3 = ___________________#4 = ___________________#5 = ___________________

Carbon dioxide

WATEROXYGEN

SUGARLight energy

Give the chemical symbol for these

biologically important atoms & ions:

Carbon _____

Hydrogen ____

Oxygen ____

Nitrogen ____

Phosphorus ____

C

H

N

P

O

H+

What do you think would happen to the rate of photosynthesis on a cloudy day?

It would be slower than on a sunny day

Which part of photosynthesis can continue at night?

Calvin cycle

Another name for the Calvin cycle

Light INDEPENDENT reactions

Write the chemical equation for photosynthesis

___________+___________ → __________ + __________6 CO2 6 O2

6 H2O C6H12O6

Image from: BIOLOGY by Miller and Levine; Prentice Hall Publishing©2006

How many molecules of CO2 are needed to make 1 molecule of glucose? 6