Essay
Extended Essay in Biology HL (29/34; final grade A)
- Course
- Institution
- Book
My extended essay which scored 29/34 guaranteeing me A from EE component of IB.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
TomaszZuber
Reviews received
Content preview
International Baccalaureate Extended Essay in BiologyResearch title: The relationship between various electric current voltage levels
and the germination and post-germination growth of radish (Raphanus sativus L.)
Research question: How do different electric current voltage levels (0V, 3V, 6V, 9V, 12V)
influence germination and post-germination growth of Raphanus sativus L.?
Word count: 3939
I declare this work is my own work and is the final version. I have acknowledged each use of
the words or ideas of another person, whether written, oral or visual.
,Contents page
1. Introduction ......................................................................................................................... 4
2. Research question................................................................................................................ 4
3. Background information ..................................................................................................... 5
3.1 Germination and post-germination plant growth. ............................................................... 5
3.2 Effect of electric current on plant growth ............................................................................ 5
3.3 Characteristics of radish (Raphanus sativus L.) .................................................................. 6
4 Preliminary experiment ....................................................................................................... 7
5 Variables ............................................................................................................................. 7
6 Hypothesis ........................................................................................................................... 8
7 Methodology ....................................................................................................................... 9
7.1 Equipment ........................................................................................................................... 9
7.2 Procedure ............................................................................................................................ 10
8 Results ............................................................................................................................... 11
8.1 Numerical data ................................................................................................................... 11
8.2 Observations ....................................................................................................................... 12
9 Statistical analysis ............................................................................................................. 12
10 Data analysis ..................................................................................................................... 14
11 Evaluation ......................................................................................................................... 19
12 Conclusion......................................................................................................................... 20
13 Ideas for further improvement of the experiment ............................................................. 21
References ................................................................................................................................ 22
2
, Abstract
The aim of the following investigation was to determine the effect the electric current has on
post-germination growth of Raphanus sativus L. seedlings. The hypothesis was: application
of electric current to seeds and seedlings of Raphanus sativus L. will result in accelerated
growth (in optimum voltage) or in decelerated growth (in too low or high voltage) of roots and
shoots. Specific voltages (0V, 3V, 6V, 9V, 12V) were chosen in order to provide wide spectrum
of data and facilitate localization of voltage for which the change in growth was the greatest.
The experiment involved 40 samples (8 per trial) and lasted 10 days, after that time the roots,
shoots, and total lengths of samples were measured. There turned out to be no correlation
between length of shoots or total length and the voltage applied to seeds. However, in case
of root length the post-hoc Tukey test showed significant difference between 0V and 3V trials.
The difference corresponded to root length increase of 40%. Nevertheless the research is
inconclusive and further experiments need to be conducted in order to refute or support
the hypothesis.
Word count: 183
3
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TomaszZuber. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.68. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82871 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now