Class notes

BIOL1218 Lab Exam Notes

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Course
BIOL 1218 (BIOL1218)

Institution
Langara College ( )

Prepare for BIOL1218 with "Lab Exam Notes". These notes are in question and answer format; perfect for active recall sessions. They're packed with all the necessary details, presented in a clear and friendly format. With helpful diagrams and photos, consider it your personal guide to mastering the...

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Uploaded on July 19, 2024
Number of pages 15
Written in 2021/2022
Type Class notes
Professor(s) Cam macdonald
Contains All classes

biol1218 lab exam
biodiversity and conservation biology

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BIOL 1218 Lecture Notes and Lab Material 1-8

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BIOL 1218 Lab Notes 2
Property Lab Part 2

LAB 3: THE CARBON CYCLE
DATE: January 26, 2022

What is primary production?

the chemical energy generated by photosynthetic organisms (photoautotrophs)

the source of energy for all organisms — the foundation upon all ecosystems are built

energy is derived from the fixation of carbon during photosynthesis

represents a crucial energy transformation — the conversion of light energy from the sun into chemical energy that can be used
by living organisms

How is chemical energy generated by photoautotrophs stored? What is its significance?

stored as carbon compounds

carbon is one measure of primary production

plant biomass is ~50% carbon, we can use that as an estimate for measuring the amount of primary production done

What is GPP?

gross primary productivity

the total amount of carbon fixed by photoautotrophs

GPP is equivalent to all photosynthesis done by plants in the area

How much solar energy can plants convert into chemical energy?

less than 1% of the available solar energy

BIOL 1218 Lab Notes 2 1

, What is cellular respiration?

process whereby energy stored in the chemical bonds of carbohydrates is transferred to the chemical bonds of the molecule ATP

ATP — the “energy currency” in our bodies

supports metabolism and growth in organisms

most eukaryotic organisms carry out cellular respiration

all plant tissues lose carbon through respiration

uses ~50% of the carbon it generates from photosynthesis to power itself via cellular respiration

What is NPP?

net primary productivity

🌟 NPP = GPP - respiration

NPP represents the biomass gained by the plant — therefore, the amount of plant material (and carbon) available for herbivores
to consume

ACTIVITY 2 needs to be completed

Procedure

Week 1: Jan 30th (DID THIS LAST WEEK)

Randomly assign the six pots to one of three treatments: “Week 1”, “Week 2 Light” , and “Week 2 Dark” (2 pots per treatment).

Week 1 treatment: cut the grass above the soil line from 2 pots. Weigh and record the cut plant material from each pot (Week 1
Grass Wet Weight). Place the plant material from each pot into separate envelopes, label (group member names, treatment
and lab section) and give to your lab instructor to dry.

Week 2 Light treatment: leave 2 pots untouched, allow to grow for one week

Week 2 Dark treatment: these 2 pots will be grown in the dark so that no light reaches the plants, allow to grow for one week.

Week 2: Feb 6th (START HERE)

Describe appearance of the plants. Cut the grass above the soil line from the two Light pots. Weigh the cut plant material and
record these data (Week 2 Grass Light Wet Weight). Place in envelopes, label (group member names, treatment and lab
section) and give to your lab instructor to dry.

Describe appearance of the plants. Cut the grass above the soil line from the two Dark pots. Weigh the cut plant material and
record these data (Week 2 Grass Dark Wet Weight). Place in envelopes, label (group member names, treatment and lab
section) and give to your lab instructor to dry.

Week 3: Feb 13th

Weigh Week 1 Grass that has been dried (Week 1 Grass Dry Weight)

Weigh Week 2 Dark Grass that has been dried (Week 2 Dark Grass Dry Weight)

Weigh Week 2 Light Grass that has been dried (Week 2 Light Grass Dry Weight)

Week 1 Pot 1 weight — 5.43 g

Week 1 Pot 2 weight — 5.82 g

Calculations:

Week 2 Light Grass Dry Weight — Week 1 Grass Dry Weight = NET PRODUCTIVITY

4.90-0.45 =

4.00-0.39 =

BIOL 1218 Lab Notes 2 2

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