Global challenges Flashcards
How do you estimate animal population size
(first sample x second sample)/marked in second
How can you sample animals
Pooters
Sweeping nets
Kick sampling
Tree beating
Pitfall traps
How is biodiversity lost
Deforestation
Polution
Hunting and fishing
Agriculture
How can biodiversity be increased
Conservation eg controlled grazing
seed banks
captive breeding
Air pollution monitoring
Indicator organisms
Lichen - stunted growth with sulphur dioxide
Water pollution monitoring
Indicator species eg slugworm shrimp
What factors affect food security
growing population
changing diets
new pests and pathogens
climate change
How can food security be improved
Yield pest resistant crops
maximise photosynthesis
fertilisers
herbicide
- of selective breeding
- gene pool
- chance of inheriting genetic diseases
how can fertiliser usage be reduced
use compost
crop rotation
biological control
hydroponics
growing plants in water w minerals
+ - genetically engineered
Faster, yield density, resistance
health effects, cross-pollination
genetic engineering
donor dna cut at specific bases to make sticky ends (restriction enzyme). ligase enzymes rejoin it with the plasmid, then insert into a bacterium.
foreign genes -
antibiotic resistant bacteria in agar plate
pathogens spread
animal
cuts digestive system respiratory system reproductive system
plant
soil sap vectors
