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Photosynthesis and Cellular
Respiration Rates in Plants Using Vernier Probes
Time: 55
minutes
Grade level: 9-12
Objectives:
· Students will be able to use CO2
Gas Sensors to measure the amount of carbon dioxide consumed or
produced by a plant during respiration and photosynthesis.
· Students will be able to determine the rate of respiration
and photosynthesis of a plant.
Idaho Achievement Standards:
· 649.01c Use technology and
mathematics to improve investigations (data collection and analysis)
and communication.
· 652.02a Know that atoms and
molecules cycle among the living and nonliving components of the
biosphere.
· 652.02b Trace energy flows
through ecosystems in one direction, from photosynthetic organisms
to herbivores to carnivores and decomposers.
· 653.01b Know that living systems
require a continuous input of energy to maintain their chemical
and physical organization.
· 653.01c Know that the energy
for life is primarily derived from the sun through photosynthesis.
· 653.01d Understand cellular
respiration and the synthesis of macromolecules.
· 653.01e Know that chemical
bonds of food molecules contain food energy, which is released
when the bonds are broken.
· 653.01h Trace how matter cycles
and energy flows through different levels of organization of living
systems - cells, organs, organisms, communities - and between
living systems and the physical environment.
Materials:
· Living leaf samples from different
types of plants
· Computers loaded with Logger Pro software
· Vernier computer interface
· Vernier CO2 Gas Sensors
· 250-mL conical flasks
· Lamps
· Colored cellophane
· Ice bath
· Aluminum foil
· Forceps
· Tape
· Scissors
· Paper towels
· Colored chalk
· 500 mL beaker with water
Procedure:
· I will engage the students through
quickly explaining that they will be conducting experiments on plant
leaves to determine the rate of consumption or production of CO2
using gas sensors. (Time 3 min.)
· I will have the students get into groups of 2-3, come to
the materials table and pick up the "Procedures Paper",
"Data Collection/Answer Sheet", their "Take Home
Assignment", leaf sample (of choice), and 250 mL flask. and
let them choose the plant material they wish to work with. (Time
2-3 min.)
· I will demonstrate for the students how to set up experiment;
(putting leaf into flask, sensor into flask, and starting data collection
with computer) and have them get started. (Time 1-2 min.)
· As students start their experiments I will ask them questions
concerning photosynthesis and respiration allowing them to answer
and then explain the chemical equation to the students of what happens
during photosynthesis and respiration. (Time 3-5 min.)
· During the experiments I will move from group to group
asking them questions and answering their questions about their
experiments, what they notice happening with the data collection,
and their predictions. (Time 25-30 min.)
· When both experiments are over each group (one group at
a time), will graph their results from the data they collected on
a chalkboard graph prepared for their data. Students may start another
experiment if time allows. (Time 3-5 min.)
· I will have students present their findings to the rest
of the class by discussing their predictions and results. (Time
3-5 min.)
· As a class we will discuss the chalkboard graph by comparing
data from each experiment to other data sets. We will look for similarities
and differences and discuss possible reasons for their existence.
(Time 3-5 min.)
Assessment:
· I will conduct an oral assessment
to determine what the students know about photosynthesis and cellular
respiration.
· I will hand out a data collection sheet that will allow
students to make predictions and complete information pertinent
to graphing and data comparisons.
· During the lab I will move from group to group asking questions
and discussing what the students are observing.
· At the end of the experiments I will have students explain
their findings and I will have an open discussion with the class
about similarities and differences among the experiments.
· Students will complete a formal assessment and turn it
in the following week with their data collection sheets.
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