100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Biology Condensed Notes - GCSE £2.99   Add to cart

Interview

Biology Condensed Notes - GCSE

 126 views  1 purchase

Condensed notes on the topics in the Biology GCSE (AQA spec but also relevant to many other courses) that I found the hardest to remember and understand. Topics include: - Human Influences on the Environment (including effects of farming and pollution) - Gas Exchange and Transport in Plants Ec...

[Show more]

Preview 2 out of 12  pages

  • February 6, 2021
  • 12
  • 2019/2020
  • Interview
  • Unknown
  • Unknown
book image

Book Title:

Author(s):

  • Edition:
  • ISBN:
  • Edition:
All documents for this subject (888)
avatar-seller
minniefn
Biology
Human Influences on the Environment
Eutrophication

• Fertilisers or sewage are leached into water
• Nitrate levels rise
• Causes algae to grow – algal bloom
• Light is blocked so plants can’t photosynthesize
• Plants die and are decayed by bacteria
• Water becomes anoxic – more respiration from bacteria
• Aerobic fish die


Pesticides

Chemical Pesticides – chemical poisons that kill pests (e.g. DDT)
• Easy to use
• Fast effect
• Cheap
• Reduces biodiversity
• Pesticide resistance
• Bioaccumulation

Biological control – using a predator to control pest numbers (e.g. cane toad)
• Single use
• Specific to pest
• No bioaccumulation or toxins
• Difficult to contain and control
• Doesn’t completely eliminate pest
• Imbalance to food chain and ecosystem


Acid Rain

Sulfuric Acid – sulphur dioxide released from fossil fuels, dissolves in rain
Nitric Acid – nitrogen oxides released in car fumes, dissolve in rain

Effects:
• Damages leaves and roots- can’t photosynthesize or get minerals
• Acidic lakes – fish die/don’t hatch, amphibians’ skin is damaged
• Ions dissolve more, so are leached away with rain, reducing soil fertility

, Carbon Monoxide

Made during incomplete combustion of fossil fuels and plastics
Bonds strongly to haemoglobin in blood, reducing its ability to carry oxygen


Global Warming

Greenhouse Gases:
• Carbon dioxide – from fossil fuels
• Methane – from agriculture, e.g. cows, rice
• CFCs – from aerosols and refrigerators

Greenhouse gases – short-wave radiation from sun is absorbed and reflected by
greenhouse gases as long-wave radiation – stuck in atmosphere

Effects:
• Rising sea levels
• Changes in ocean currents
• Changes in rainfall patterns
• Changes in migration patterns
• New crop pests
• Species extinction


Deforestation

Causes:
• Agriculture
• Population increase – housing
• Wood used for timber

Effects:
• Erosion of soil
• Ions leached
• Imbalance of water cycle
• Carbon dioxide levels rise
• Oxygen levels decrease
• Loss of habitats

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 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 minniefn. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £2.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73918 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£2.99  1x  sold
  • (0)
  Add to cart