Lab report format - sample, Study Guides, Projects, Research of Biology

This is an example of a lab report format

Typology: Study Guides, Projects, Research

2022/2023

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Part 1: Lab Reports
Some of your science classes at Millersville University will require you to complete lab reports
or term papers for simple experiments to show that you understand the scientific method. The
scientific method usually includes (1) an Introduction section, (2) a Materials and Methods
section, (3) a Results section, (4) a Discussion section and a Literature Cited section.
The goal of a lab report should be to simply present the facts. The goal of science is truth,
thus no persuasion is necessary in this type of document.
Overall writing formats or guidelines for these lab reports should include the following:
1. The reports should be typed and double-spaced using a computer. Reports should be in
12 point size, Times New Roman style, have 1 inch margins, and organized neatly for the
reader to understand your experiment.
2. Correct spelling and grammar is a must, and the report should be written in complete
sentences (with subject and verb). Points may be deducted for incorrect spelling and
grammar.
3. Past tense should be used whenever writing about what you did in lab, since what you did
happened in the past.
5. Each section should be labeled with the appropriate heading (Introduction, Materials and
Methods, Results, Discussion, Literature Cited).
6. Do not plagiarize (the "wrongful appropriation" and "stealing and publication" of
another author's "language, thoughts, ideas, or expressions" and the representation of
them as one's own original work).
7. To help with clarity: proof-read, then have somebody else proof-read, and then
proof-read again.
The Following page begins an example lab write-up. Comments throughout this example
outline the reasoning for the writing style and further details on how to follow a proper
scientific writing style. THIS EXAMPLE IS TEXT LIGHT FOR YOUR BENEFIT.
YOUR PAPER WILL HAVE MORE SOURCES AND WAY MORE TEXT FOR EACH
SECTION.
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Part 1: Lab Reports

Some of your science classes at Millersville University will require you to complete lab reports

or term papers for simple experiments to show that you understand the scientific method. The

scientific method usually includes (1) an Introduction section, (2) a Materials and Methods

section, (3) a Results section, (4) a Discussion section and a Literature Cited section.

The goal of a lab report should be to simply present the facts. The goal of science is truth,

thus no persuasion is necessary in this type of document.

Overall writing formats or guidelines for these lab reports should include the following:

1. The reports should be typed and double-spaced using a computer. Reports should be in

12 point size, Times New Roman style, have 1 inch margins, and organized neatly for the

reader to understand your experiment.

2. Correct spelling and grammar is a must, and the report should be written in complete

sentences (with subject and verb). Points may be deducted for incorrect spelling and

grammar.

3. Past tense should be used whenever writing about what you did in lab, since what you did

happened in the past.

5. Each section should be labeled with the appropriate heading (Introduction, Materials and

Methods, Results, Discussion, Literature Cited).

6. Do not plagiarize (the "wrongful appropriation" and "stealing and publication" of

another author's "language, thoughts, ideas, or expressions" and the representation of

them as one's own original work).

7. To help with clarity: proof-read, then have somebody else proof-read, and then

proof-read again.

The Following page begins an example lab write-up. Comments throughout this example

outline the reasoning for the writing style and further details on how to follow a proper

scientific writing style. THIS EXAMPLE IS TEXT LIGHT FOR YOUR BENEFIT.

YOUR PAPER WILL HAVE MORE SOURCES AND WAY MORE TEXT FOR EACH

SECTION.

John Smith

Principles of Zoology/Section B

Lab Report

IMPACTS OF NITROGEN ON PLANT GROWTH

JOHN SMITH, Millersville University, Millersville, PA, 17551.

Abstract : We wanted to evaluate the effect of nitrogen fertilizer on American water weed

( Elodea Canadensis ) biomass growth. Our hypothesis was that more nitrogen fertilizer would

increase plant biomass. We used 5 cultured bowls in which to grow plants. Each cultured bowl

contained an increasing amount of nitrogen fertilizer, starting with bowl 1 with the least amount

with increasing to bowl 5. We conducted 2 separate experiments to evaluate consistency of

results. We found that plant biomass growth increased with more nitrogen fertilizer to a point.

At the highest levels of nitrogen, plant growth declined dramatically. Both experiments had the

same conclusion with results having no significant difference (P > 0.05). We suggest further

research into the potential toxic impacts of too much nitrogen fertilizer on plant growth.

Introduction

The purpose of this lab was to examine the effect of nitrogen fertilization on plant

growth. Nitrogen occurs in all living organisms and is believed to be an important nutrient for

plant growth (Chalk 1991). To evaluate the impacts of nitrogen on plant growth, the aquatic

plant American water weed ( Elodea canadensis ) was grown in water containing different

amounts of nitrogen. Ammonium nitrate was used as our source of nitrogen fertilizer.

The hypothesis tested was that since American water weed requires nitrogen to make

organic compounds like proteins (Chalk 1991), the more nitrogen it has available, the better it

should grow. The null hypothesis was that nitrogen would have no impact on plant growth.

Comment [ah1]: Student name, class, lab #, and date should be at upper left and single-spaced. Comment [AH2]: Student name and school address. Comment [AH3]: Term paper or lab reports should include an abstract page after the title page. An abstract is a paragraph that summarizes the whole paper (all sections). I would recommend writing the full paper and then writing the abstract last. This will make things easier. Developing a complete and solid abstract is very important. Many times you will be submitting this abstract of your research to scientific symposiums and conferences so that you can gain approval to present your research at these venues. Comment [AH4]: Your abstract only needs to be one paragraph. It should include the goals of the paper, main points you found, results and any discussion of these main points to your hypothesis, future research needs or final conclusions. Citations are not in the abstract. Comment [ah5]: In the Introduction you start out describing a question about what your research is going to answer. Then you give background literature on all the other studies that have tried to answer this question or tried to answer questions similar to the one you are doing research on. Then you briefly state the objectives of your experiments and the type of experiments you performed. Towards the end of your Introduction you specify the goal of your experiments and state a hypothesis of what you expect to happen during the experiment. Your introduction will be much longer. Comment [AH6]: Citation style from source that had 1 author. Comment [ah7]: For every organism mentioned you should include its scientific name when it is first mentioned. This includes the genus name that is capitalized and the species name in lower case. The scientific name is in italics and in parenthesis. Comment [ah8]: Lab is written in past tense. This lab is on work that you have already completed.

Results

We wanted to test to see if the amount of nitrogen fertilizer impacts plant biomass

growth. Plants with higher levels of nitrogen had greater plant mass except for bowl number 5

(Figure 1). We found the same results for both experiments, where the mean of experiment 1 was

2.23 and mean of experiment was 2.10 (Figure 2). The t-statistic value was 0.25 and was less

than the t-critical value of 2.31, also the p-value was 0.81 which is greater than 0.05 (Table 2),

thus we found no significant difference in plant mass between experiments 1 and 2. The

American water weed plant in bowl 5 had started to turn brown and looked like it was dying, but

the plants in all other bowls looked green and healthy.

Figure 1. Mean plant mass in bowls of increasing amounts of nitrogen for 2 experiments. Bowl

one had low levels of nitrogen while bowl 5 had very high levels as outlined in Table 1.

Bowl 1 Bowl 2 Bowl 3 Bowl 4 Bowl 5

Mean Plant Mass (g)

Bowl Number Indicating Amount of Nitrogen (1 low;5 high)

Experiment 1

Experiment 2

Comment [ah20]: Your results should have text which directly and concisely tells you the results of the experiment. The results of your experiments can often be displayed in the form of tables or figures (graphs or pictures). It is customary to number and label each table and figure, and then refer to each table and figure, in order, in the text of your report. Your results section will be longer. Comment [ah21]: All paragraphs should be more than one sentence. Comment [ah22]: All axis should be labeled and have correct units. Comment [ah23]: All Figures should have a caption which is located at the bottom of the figure (this is different from the Tables which have the caption up top). Like Tables, every Figure should be referenced in the text and then displayed after referenced. Figures should be labeled in the order they were referenced and should be able to stand alone for interpretation.

Figure 2. Mean plant mass and standard deviation error bars for all 5 bowls in experiment 1 and

2. Comparative statistics are outlined in Table 3.

Table 2. Results of a student t-test assuming equal variances between 2 experiments that both

tested impacts of nitrogen levels on plant biomass growth. There was no significant difference

between the two experiments (t-statistic t< t-critical; p-value = 0.81).

Experiment 1 Experiment 2

Mean 2.23 g 2.10 g

Variance 2.20 g 1.79 g

t-statistic 0.

t-critical 2.

2-tailed p-value 0.

Experiment 1 Experiment 2

Mean Plant Mass (g) For All 5 Bowls

Comment [ah24]: All Figures should have a caption which is located at the bottom of the figure (this is different from the Tables which have the caption up top). Like Tables, every Figure should be referenced in the text and then displayed after referenced. Figures should be labeled in the order they were referenced and should be able to stand alone for interpretation.

COMMON WRITING ERRORS

Written and oral communications are extremely powerful ways of representing yourself to others. Using

proper grammar when speaking and writing for professional audiences can be a tremendous asset to your

professional success. Obviously, inadequate writing or speaking will severely limit your career

development.

 Attention to detail and proofreading your work will be critical to successful writing!

ERROR TYPE OF ERROR COMMENTS

1 Incomplete sentences Topping the list of writing errors is incomplete sentences.

Incorrect: The two extractions were combined. Then dried for five hours.

Correct: The two extractions were combined. They were then dried for five hours.

2 Subject-verb agreement If the subject is singular (or plural) the verb must match appropriately. In the following

defective sentence, the noun is plural while its verb is singular.

Incorrect: Our results indicates the significance of intracellular signaling systems.

Correct: Our results indicate the significance of intracellular signaling systems.

3 Misspelled words Use your spell checker!

Remember, the only way to really check spelling is to PROOFREAD your work because

spell checkers do not catch all errors.

4 Affect vs. effect "Affect" is a verb, "effect" is a noun. Remembering the acronym "NEVA" (noun effect

verb affect) may help. Examples:

The effect of the medication was noticeable.

Medication rates affect the level of hypertension.

5 Data vs. datum "Data" is plural, "datum" is singular.

Examples:

The data are ....

The datum is...

6 Do NOT use quotes Avoid using verbatim quotations from technical references. Instead, reword phrases/ideas

from the reference and then cite the reference that presented that idea.

Example:

“To be or not to be, that is the question”.

Revision:

The ultimate question is whether or not one should pursue existence in this life

(Shakespeare, 1592).

7 Use of contractions

(especially its vs. it's)

"It's" is the contraction of "it is". In general, avoid using any contractions in scientific

writing.

Incorrect: Results didn't differ among treatment groups.

Correct: Results did not differ among treatment groups.

8 Writing numbers less than

(.78 vs. 0.78)

When writing a number that is less than 1.0, always place a zero to the left of the decimal.

Incorrect: .454, .8, etc.

Correct: 0.454, 0.8, etc.

9 Writing numbers

(general rules - these rules

vary somewhat in different

style manuals)

Spell out numbers at the start of a sentence and one digit numbers (zero – nine) appearing

anywhere in a sentence. Never begin a sentence with a numeral.

Use numerals when a number has a unit of measure, when reporting statistics or when the

number refers to a page, time, date, figure, table, magnification, etc. In a series

containing some numbers greater than nine, use numerals for all.

Note the appropriate use of numbers in the following examples:

Fifteen chickens crossed the road. (incorrect: 15 chickens crossed the road.)

Insects have six walking legs.

We had 425 insect specimens in our collection.

All 10 of us attended lab this week.

Ten of us attended lab this week.

Most tissue samples weighed less than 15 grams.

Several tissue samples weighed less than 4 grams.

The audience included three students and eight instructors.

The audience included 3 students, 8 instructors, and 13 chinchillas.

The experimental diet caused body mass to increase by 5% (Table 2).

10 Writing species names Biologists are especially ‘picky’ about writing species names. See lab manual pg. 42 for

important rules that apply to zoological nomenclature.

Incorrect: homo sapiens, Homo sapiens, Homo Sapiens, Homo Sapiens, etc.

Correct: Homo sapiens (or Homo sapiens when handwritten)

11 Since vs. Because "Since" should be restricted to making time comparisons.

Incorrect: Since they have rich soil, tall-grass prairies were rapidly converted to row crop

agriculture.

Correct: Since settlement by Europeans, tall-grass prairies have largely disappeared.

Because of its rich soil, tall-grass prairies were rapidly converted to row crop agriculture.

12 When to use " et al ." The phrase " et al. " is used when making an internal citation of a work that has three or

more authors. (Review internal citation format, pg. 24 in your lab manual.) Because this

phrase is derived from Latin, it is usually italicized.

Examples:

Smith et al. (1983) found that... (indicates that this reference had at least three authors, the

first of whom was Smith).

Smith and Jones (1999) found that... (indicates that this reference had two authors).

13 Than vs. Then The word “then” is used in many ways, but it is always used to denote time or sequence

in some way, shape or form. The word “than” is a conjunction used in comparisons. To

put it simply, if you are doing a comparison, use “than”; if not, use “then.”

14 There vs. Their vs. They’re The word “there” indicates location. The word “their” is the possessive for “they.” The

word “they’re” is a contraction for “they are.”