What is Photosynthesis? Measuring Air Pressure Inside an ...

What is Photosynthesis? Measuring Air Pressure Inside an Active Photosynthetic System

(Teacher's Guide)

OVERVIEW

After placing a photosynthetic organism inside a syringe, students will measure the air pressure inside the syringe. They will relate their observations to the results obtained

during the experiment, and display them in a graph for analysis.

MATERIALS NEEDED

Ward's DataHub USB connector cable* 3 grams of Elodea canadensis aquatic plant 1 Luer-Lock syringe, 60 mL

Plastic tube Paper towel

Water Laboratory clamp for small tubes

Nut Laboratory stand Lamp with 100 watt capability

* ? The USB connector cable is not needed if you are using a Bluetooth enabled device.

NUMBER OF USES

This demonstration can be performed once, using 3 grams of Elodea canadensis. See the Ward's catalog and/or visit to order materials.

? 2012 WARD'S Science. v.11/12 All Rights Reserved

Teacher's Guide ? Photosynthesis

For technical assistance, call WARD'S at 1-800-962-2660

Dimension 1

Science and Engineering Practices

Dimension 2

Cross Cutting Concepts

Dimension 3

Core Concepts

FRAMEWORK FOR K-12 SCIENCE EDUCATION ? 2012

* The Dimension I practices listed below are called out as bold words throughout the activity.

Asking questions (for science) and defining problems (for engineering)

Developing and using models

Planning and carrying out investigations

Analyzing and interpreting data

Use mathematics and computational thinking

Constructing explanations (for science) and designing solutions (for engineering)

Engaging in argument from evidence

Obtaining, evaluating, and communicating information

Patterns

Cause and effect:

Mechanism and explanation

Scale, proportion, and quantity

Systems and system models

Energy and matter: Flows, cycles, and conservation

Structure and function

Stability and change

Discipline Life Science

Core Idea Focus LS1: From Molecules to Organisms: Structures and Processes

LS1.A: Structure and Function LS1.C: Organization of Matter and Energy Flow in Organisms LS2: Ecosystems: Interactions, Energy, and Dynamics LS2.A: Interdependent Relationships in Ecosystems LS2.B: Cycles of Matter and Energy Transfer in Ecosystems

Middle School Standards Covered

MS.LS-SFIP: Structure, Function, and Information Processing

MS.LS-MEOE: Matter and Energy in Organisms and Ecosystems

MS.LS-IRE: Interdependent Relationships in Ecosystems

High School Standards Covered HS.LS-SFIP: Structure, Function, and Information Processing HS.LS-MEOE: Matter ad Energy in Organisms and Ecosystems HS.LS-IRE: Interdependent Relationships in Ecosystems

NATIONAL SCIENCE EDUCATION STANDARDS ? 2002

Content Standards (K-12)

Systems, order, and organization

Evolution and equilibrium

Evidence, models, and explanation

Form and Function

Constancy, change, and measurement

Life Science Standards Middle School

Structure and Function in Living Systems

Reproduction and Heredity

Regulation and Behavior

Populations and Ecosystems

Diversity and Adaptations of Organisms

Life Science Standards High School

The Cell

Molecular Basis of Heredity

Biological Evolution

Interdependence of Organisms

Matter, Energy, and Organization in Living Systems

Behavior of Organisms

Indicates Standards Covered in Activity

NGSS Standards

? 2012 WARD'S Science. v.11/12 All Rights Reserved

Teacher's Guide ? Photosynthesis

For technical assistance, call WARD'S at 1-800-962-2660

LEARNING OBJECTIVES

Core Objectives (National Standards): ? Develop the ability to refine ill-defined questions and direct to phenomena that

can be described, explained, or predicted through scientific means. ? Develop the ability to observe, measure accurately, identify and control variables. ? Decide what evidence can be used to support or refute a hypothesis. ? Gather, store, retrieve, and analyze data. ? Become confident at communicating methods, instructions, observations, and

results with others.

Activity Objectives: The purpose of this activity is to study air pressure variation inside a closed system where photosynthesis is taking place. Students will formulate a hypothesis and proceed to test it, using the Ward's DataHub air pressure sensor.

Time Requirement: 60-90 minutes

? 2012 WARD'S Science. v.11/12 All Rights Reserved

Teacher's Guide ? Photosynthesis

For technical assistance, call WARD'S at 1-800-962-2660

VOCABULARY

Air Pressure: The force exerted by air when it is compressed or confined in an area.

Autotroph: An organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer.

Barometer: An instrument that measures atmospheric pressure.

Calvin Cycle: The second of two major stages in photosynthesis (following the light reactions), involving atmospheric CO2 fixation and the reduction of the fixed carbon into carbohydrates.

Carbon fixation: The incorporation of carbon from carbon dioxide into an organic compound by an autotrophic organism.

Chlorophyll: A green pigment found in some chloroplasts of plants, algae, and some bacteria.

Heterotroph: An organism that obtains organic food molecules by eating other organisms or their by-products and that cannot synthesize organic compounds from inorganic materials.

Light reactions: The steps in photosynthesis that occur on the thylakoid membranes of the chloroplast and that convert solar energy to the chemical energy of ATP and NADPH, evolving oxygen in the process.

NADP+: Nicotinamide adenine dinucleotide phosphate, an acceptor that temporarily stores energized electrons produced during the light reactions of photosynthesis.

Phosphorylation: The process of adding a phosphate group to ADP to make ATP; cells use the energy released by ATP to power essential activities.

Photosynthesis: Process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches.

Pressure: The number of pounds per square inch exerted by gaseous molecules.

? 2012 WARD'S Science. v.11/12 All Rights Reserved

Teacher's Guide ? Photosynthesis

For technical assistance, call WARD'S at 1-800-962-2660

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download