Unit 3 Food Supply Flashcards
(26 cards)
The 4 aspects of food security
Availability
Accessibility
Usage
And sustainability
Define Availability and food security
Availability is existence of food sufficient quantities and quality
Define accessibility in food security
Accessibility sufficient economic and infrastructure resources to access available foods
Define usage in food security
Usage is the level of nutritional value and knowledge needed to use food resources properly
Define sustainability and food security
Sustainability is to which degree can food be guaranteed over extended periods of time
Define food security
Food security is when all people have access to sufficient safe and nutritious foods Of good quality and quantity
Explain my food security has become increasingly difficult
As there is an ever-growing population and there’s not enough food to feed everyone
What do we mean by sustainable food production
Sustainable food production is that we do not degrade or natural resources which we rely upon like soil and water so that we can keep safely growing food
Give three ways to increase crop yields
Adding minerals e.g. fertiliser
Using pesticides
Using a higher yielding crop plants
Use/develop pest resistant crops
Explain why it’s better to grow crops in a given area of fertile soil rather than raising livestock there
As plants produce more energy per unit area rather than animals so that’s why it’s better/more effective to grow plants
What does all agriculture production depend on ultimately
Light water and photosynthesis
When is livestock production preferable than crop production
When crops cannot agree grown in a certain area e.g. hills that can be used for sheep farming
Name the four pigments found in a leaf
Chlorophyll A
Chlorophyll B
Carotenes
Xanthophylls
Explain the difference between absorption and an action spectra
Absorption spectrum is the amount of light absorbed per pigment of wavelength
Action spectrum shows the rate of photosynthesis by each wavelength of light
Why is it useful to have accessory pigments and leaves
They are useful to the plant can absorb a greater wavelength of light
What is the first thing that happens to light energy in the energy Stage
Chlorophyll releases late captured as high energy electrons as they get excited and get passed along the chain of transport
What is The breakdown of what are using light called
Photolysis
Give for uses of glucose by plants
Biosynthesis e.g. fats oils proteins and nucleic acids
Starch
Celulose
Respiration
List three things required for energy capture stage
Light water chlorophyll
Name two things produced in the energy capture that is used in carbon fixation
NADPH and ATP
Where exactly in the chloroplast does energy captured take place
In the thylakoids membranes
Where does the oxygen produced during photosynthesis come from
The oxygen produced comes from the energy capture stage where energy is used to split water
What is the Calvin cycle also known as
Carbon fixation
Who discovered the Calvin cycle
Melvin Calvin
