Posted: September 4th, 2022

Lab assignement 1

Need to be a lab kit to do it.

Pre-Lab Questions

Terrestrial biomes are characterized by the ___ and the annual precipitation of a region.

a. Average elevation

b. Average annual temperature

c. Salinity

d. Geographic Location

What are the two primary components of an ecosystem?

2. A ___ is a location where an organism physically resides or is adapted to live.

a. Niche

b. Biome

c. Habitat

d. Trophic Level

3. What is the name for organisms that get their energy from the Sun and do not need to eat other organisms?

a. Producers

b. Primary consumers

c. Secondary consumers

d. Tertiary consumers


4. What is the term for the increased concentration of a substance as it works its way up the food chain?

©eScience Labs, 2018

©eScience Labs, 2018

Exercise 1: Biomagnification

Data Sheet

Table 2. Components of the Biomagnification of DDT

Element of the Exercise


The original concentration of DDT in the water

Concentration of DDT in the plankton

How many times higher is the concentration of DDT in the plankton than in the water?

Concentration of DDT in the shrimp

Concentration of DDT in the seatrout

Concentration of DDT in the osprey

How many times higher is the concentration of DDT in the osprey than in the water?

Exercise 1 Post-Lab Questions

1. DDT is also toxic to fish and aquatic invertebrates. Based on what you know about ecosystems and food chain dynamics, what are some potential impacts to an aquatic ecosystem that receives a particularly high dose of DDT (i.e., a much higher original concentration of DDT in the water)?

2. Half-life is the time required for half of an amount of a particular compound to degrade (see table below). The half-life of DDT in the soil is from 2 to 15 years, and the half-life of DDT in an aquatic environment is 150 years.

1 half-life

50% degraded

2 half-lives

75% degraded

3 half-lives

88% degraded

4 half-lives

94% degraded

5 half-lives

97% degraded

a. How many years have passed after five DDT half-lives in an aquatic environment?

b. If the original concentration of DDT in the water is 2 ppm, how much DDT would be remaining in the water after 1 half-life?

c. How much DDT would be remaining in the water after 5 half-lives?

3. Do you think DDT has the potential to cause more long-term harm to an estuary ecosystem or a terrestrial (on land) ecosystem? Why?

Exercise 2: Studying a Miniature Ecosystem

Data Sheet

Table 3. Ecosystem Observations



Day 1

Week 1

Week 2

Week 3

Other (note time)

Other (note time)

Table 4. Elements of the Terrarium Ecosystem

Abiotic Elements

Biotic Elements

Exercise 2 Post-Lab Questions

1. What are the organisms in your terrarium ecosystem?

2. What trophic levels are present in your terrarium ecosystem?

3. Give an example of an organism that is higher on the trophic pyramid than a producer that would thrive in your ecosystem.

4. What niche would the organism in Question 3 be filling in your terrarium ecosystem?

5. What adjustments to the abiotic and biotic components of your terrarium ecosystem would make it healthier?





· L 3-1 Define and differentiate among the terms biome, ecosystem, habitat, and niche (

· L 3-2 Relate energy flow to food chain dynamics (

· L 3-3 Describe the process of biomagnification (

· L 3-4 Analyze the effects of abiotic and biotic factors on an ecosystem (

Discussion Board Topic #2 Learning Objectives:

· D-2a. Discuss the use of pesticides on the environment. 

· D-2b. Discuss the pros and cons of using pesticides. 

· D-2c. Explain the impact of vector-borne diseases caused by insects and animals. 

How will you achieve these objectives? (Activities)

1. Read chapter 3 in the textbook, and work through the chapter’s review questions to practice recognizing the key concepts.   

2. Complete the homework assignment questions based on the chapter reading. 

3. Complete the lab 3 exercise, including watching, learning and any demonstration videos, completing the hands-on experiments, recording data, photo-documenting your experiments (where applicable) and taking notes on what you learned.

4. Complete the Discussion board #2 activity. 

How will I measure whether you have achieved these objectives? (Assessment)

1. Lab 3 exercise – covers the background information and the results from the lab 3-1 digital exercise

2. Lab experiment 3-2:  This lab will require a two weeks of observations and will be due on week 4 of the semester (link to submit final experiment results will be found within the week 4 folder).  

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