CONTROLLING CLIMATES:
• Controlling climates allows farmers to control temperature, light
intensity and carbon dioxide to increase growth of plants
• There are two main ways of controlling climate:
o GLASSHOUSES – allows artificial heating, artificial lighting, increasing
carbon dioxide content of air and regular watering – however there is
also an extra cost of providing these things
o POLYTHENE TUNNELS – large enough for machines to work inside
them, they can protect crops grown outside from weather (e.g. wind,
rain, extreme temperature), prevents the entry of pests, increase in
temperature outside the tunnel too
• Farmers can benefit from increasing carbon dioxide/temperature levels
as long as temperature/carbon dioxide and light are optimal – MORE
GLUCOSE is made and therefore there is more energy for crops = faster
growth and a HIGHER YIELD
USE OF FERTILISER:
• FERTILISERS provide elements needed for plants to grow well such as
nitrogen, phosphorus and potassium – they make crops grow faster and
bigger so yields are increased
o The compounds must be water-soluble so the plant can absorb them
through their roots
PEST CONTROL:
• There are two types of pest control. They are easily accessibly, have an
immediate effect and kill the entire population of pests – but the
organism they are meant to be killing may develop resistance to them
and also can sometimes kill beneficial organisms
o Using PESTICIDE - insecticide, herbicide, fungicide
o Using BIOLOGICAL CONTROL – when you introduce another species
to get rid of pests. These both are to:
69
, § Protect the crops from PESTS eating them
§ Reduce weeds which can take up space/water/soil nutrients
for crop plants
MICROORGANISMS:
• Microorganisms can be used by humans to produce food and other
useful things. They can GROW RAPIDLY and have SIMPLE NUTRIENT
REQUIREMENTS
• We can use YEAST, a type of single-celled fungus, to make bread and
beer - when it anaerobically respires ethanol and carbon dioxide (causing
the bread to rise and beer to fizz) are made
• BEER PRODUCTION:
o Sugar is extracted from plants, yeast is added and kept warm, air
and other microorganisms are kept out of fermentation container
using an air lock, fermentation is allowed to continue, mixture is
clarified by settling and filtration, drink is pasteurized then stored
This is a fermenter, which can
make beer and yoghurt – it
must have specific conditions
70
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 anish24shah. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.08. You're not tied to anything after your purchase.
