100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Biology SNAB - practical write up daphnia (1) $5.17
Add to cart
Quickly navigate to
Preview
  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Biology SNAB
  6.  
  7. Practical Write up

Other

Biology SNAB - practical write up daphnia (1)
 0 purchase
  • Course
  • Practical Write up
  • Institution
  • PEARSON (PEARSON)

Alevel biology practical write up is a report of a laboratory experiment conducted by students. It is required as part of the assessment for the subject. The a-level biology practical write up document is a professional report and should be organised in a clear and logical manner. It should inc...

[Show more]

Preview 1 out of 3  pages

Document information

  • August 27, 2023
  • 3
  • 2023/2024
  • Other
  • Unknown

Subjects

  • snab
  • a level
  • alevel
  • daphnia
  • caffeine
  • practical write up
  • biology

Written for

  • A/AS Level
  • PEARSON (PEARSON)
  • Biology SNAB
  • Practical Write up
All documents for this subject (12)

Seller

avatar-seller
Strvlight

Content preview

Practical 1


Caffeine Concentration:
To investigate the effect of caffeine on heart rate
Hypothesis:
The higher the concentration of caffeine,the higher amount of heartbeats per minute
Caffeine is a natural stimulant, most commonly located in tea, coffee and cacao plants and works by
stimulating the brain and nervous system. After it is consumed, caffeine is absorbed into the
bloodstream via the gut. Its main effect is on the brain, due to blocking the effects of adenosine, which
is a neurotransmitter that relaxes the brain and makes you feel tired. It may also increase blood
adrenaline levels and increase brain activity of the neurotransmitters dopamine and norepinephrine,
further stimulating the brain.[1]
Daphnia, which are common water fleas, possess a less developed nervous system compared to
humans and so have a reduced awareness of pain. The daphnia are also transparent and so the
beating heart is visible.
Equipment:
● Daphnia
● Cavity slide
● Microscope
● Daphnia(in a container full of distilled water)
● Measuring cylinder
● Distilled water
● Caffeine solution 0.5%
● Stopwatch
● Clicker
● Pipettes
● Small beakers
● Cotton wool
Variables:
● Dependent - Heart rate of Daphnia (beats per minute)
● Independent - Caffeine Concentration
● Control - leave Daphnia in caffeine solution for the same amount of time to acclimatise (5
minutes)
Risk Assessment:
➔ Probability/severity of risk: 1-Low, 2-Medium, 3-High/Likely
➔ Total Risk: 1, 2, 3, 4, 6, 9
Risk: Hazard: Probability: Severity: Total Risk: Precaution

Daphnia Daphnia 2 2 4 Try to
harmed/killed; minimise
daphnia stress;store
stressed due the daphnia in
to conditions that
environment replicate their
natural
environment

Daphnia/pond Bacteria 1 1 2 Wear gloves;
water located in the keep hands
water and on away from
the Daphnia face and wash
hands after
experiment

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 Strvlight. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $5.17. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69052 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$5.17
  • (0)
Add to cart
Added