StudyXY
RegisterLog in

Calculating GPP and NPP

This lab explores how light affects photosynthesis by measuring dissolved oxygen in water with Elodea plants under light and dark conditions—demonstrating biochemical reactions and experimental design principles.

Daniel Miller
Contributor
4.8
35
4 months ago
Preview (2 of 4 Pages)
100%
Purchase to unlock

Page 1

Calculating GPP and NPP - Page 1 preview image

Loading page image...

Mini Lab: Calculating GPP and NPPNameOpen this Video and answer the questions while watching the video: https://youtu.be/voSQZcqgYNY1.Where and what is the sample of water used in this lab? The sample water is from an algae covered fishtank.2.What is the dissolved oxygen (DO) reading of the water sample?7.4mg/L3.How many bottles are filled?24.Why was the lid of the bottle put on under the water? All the air escapes forthe bottle to only be filled withwater and the elodea plant5.What plant is put in each bottle?The elodea plant6.Describe the treatment to each bottle. (What was done differently to each bottle?) Why?One bottle was covered and in the dark while the other was in the light to measure the differences of itscellular respiration to demonstrate the effect light has on biochemical reactions, such as photosynthesisPause the video and use what you've learned about experimental design t o answer these questions:7.List 4 constants (the things that are the same for each bottle) in this lab:Same amount of water, same plant (Elodea) source, time measured, light source.8.What is the independent variable?bottle covered or in theIight__________________________________9.What is the dependent variable? (What will we measure?)Dissolved oxygenPlay the video to get the results and answer these questions:

Page 2

Calculating GPP and NPP - Page 2 preview image

Loading page image...

10. What is t h eDOlevel of the bottle that was in t h e light?10.0nng/L11.Whatis the DO level of the bottle that wasinthe dark?5.3mg/LFill in this chart:Initial Dissolved Oxygen (ppm)(both bottles)Final Dissolved Oxygen in DarkBattle (no photosynthesis, onlyrespiration)Final Dissolved Oxygen in LightBottle (both respiration andphotosynthesis)7.4 mg/L5.3 mg/L10.0 mg/L12. Calculating Respiration Rate:Only respiration(andnot photosynthesis) can occur in a darkbottle.Respirationrate is the decrease in DO overtime. To determine this for your sample, subtract the dark DO from the initial DO,then divide it by t h e time (usually i n days). This will give!..an answer i n m g O/L/day. Use the formula below t oRespiration rate-i n i*i aL )dar(mg.) ]assist you. In a water solution, ppm = mg/Llime (days)R = (7.4-5.3)/(2)=1.05O/L/day13. Calculating Gross Primary Productivity:Gross Primary Productivity (GPP) is the total amount of carbon that wasfixed by organisms over a period of time. To determine this for your sample, subtract the dark bottle DO from thelightDOvalues,thendivideitbythe time (usuallyindays). This willgive an answer in mg O/L/day. Usethe formula below to assist you., .(light or enriched D O (mg L ) - dark D O (mgGross productivity =—- -------------------------—=■------------------- ————time (days)GPP = 10.0 mg/L-5.3/2= 2.35 oyiVday14.Calculating Net Primary Productivity:Net Primary Productivity(NPP)is the totalamountof carbon that was fixedby organisms into living tissue minus that used for respiration over a period of time To determine this for yoursample, subtract the respiration rate in mg Oz/L/day from GPP in m g O/L/day. This will give an answer in mgoyL/day. Use theformula NPP = GPP - RNPP = 2.35O2/L/day-1.05Oz/L/day=1.3 Q,/L/day15. You can also use the formula below t o calculate the net primary productivity since the difference between thelight bottle DO and the initial DO is essentially the same algebraic expression as GPP minus respiration rate.
Preview Mode

This document has 4 pages. Sign in to access the full document!

Study Now!

XY-Copilot AI
Unlimited Access
Secure Payment
Instant Access
24/7 Support
Document Chat

Document Details

Subject
Biology

Related Documents

View all
Solved Assignments

Amoeba Sisters Video Recap of Meiosis

Review the steps and significance of meiosis with this Amoeba Sisters video recap—learn about chromosome numbers, crossing over, and errors like nondisjunction, all while exploring how genetic variation is created in gametes.

Class Notes

Endocrine System

A comprehensive overview of the endocrine system, covering key glands, hormone functions, and homeostatic mechanisms—ideal for anatomy and physiology students at any stage of their coursework

Past Exams

AS Biology Paper 1 2024

Worksheet on the human gas exchange system with labeled diagrams and questions on lung structure and alveolar gas exchange. Includes identification tasks and matching activities. Ideal for GCSE biology practice

Class Notes

Kami Export - Sandra Nichols - Bio-Worksheet-Mutat

This worksheet explains DNA mutations: deletions and insertions cause frameshifts; substitutions can be silent, missense, or nonsense. It shows how mutations change amino acids and includes sickle cell anemia as an example of a missense mutation.

Solved Assignments

Cami Salazar Correa Cell Energy Cycle Gizmo

Explore how photosynthesis and cellular respiration cycle energy through plant and animal cells. Use the simulation to visualize how glucose and ATP are created, stored, and used by cells.

Solved Assignments

11 Transport in Cells S

This worksheet explores how water moves in and out of cells through osmosis. Using a model with sugar and water molecules, it examines selectively permeable membranes and helps students analyze molecule movement, ratios inside outside the cell.

Solved Assignments

Protein Structure

Explore the levels of protein structure and understand how functional groups like amine and carboxyl groups influence protein folding, function, and interactions.

Solved Assignments

Dihybrid Cross Amoeba Sisters Video Recap

Amoeba Sisters Video Recap worksheet on Dihybrid Crosses using Mendelian genetics. Focuses on pea plant traits (color and texture), Punnett square practice, genotype/phenotype identification, and understanding inheritance probabilities.

Solved Assignments

11 Transport in Cells-S (KEY)

This text explores how water moves in and out of cells through osmosis, highlighting the importance of water balance in the body. Disrupted water levels can harm cells and organs, potentially causing swelling, brain damage, or even death.

Solved Assignments

How Changes in Population Lead to the Formation of

Natural selection worksheet illustrating directional, disruptive, and stabilizing selection through body‐size vs. population graphs. Includes questions on comparing variables and identifying selection types from the models.