20.1, 20.2 Food Supply, Habitat Destruction

Modern Tech = ↑Food Production via:
>  Agricultural m__ to use l__ areas of land = ↑e__
>  Chemical f__ = ↑y__
>  I__ = ↑q__ & ↑yield
>  H__ = ↓c__ w/ weeds
>  S__ breeding = ↑production of crop plants & livestock e.g. cattle, fish, poultry

machinery, larger, efficiency, fertiliser, yield, insecticide, quantity, herbicide, comp, selective

Monoculture

production of single species by a farmer

Monocultures

Adv	Disadv
Ø  ↑y__ (↓c__. w/ other species) Ø  ↑e__ (same tech used across wide area) Ø  ↑p__ (↑harvests)	Ø  ↓v__ = prone to d__ = ↓nat. selection Ø  ↓n__ (crops are removed) Ø  Disrupts f__ chains & nutrient cycles Ø  ↓b__ = ↓nat. predators = ↑pests = ↑pesticides used Ø  Soil e__ (w/ harmful pesticides) into rivers = contamination

yield, comp, efficient, profit, variation, disease, nutrients, food, biodiversity, erosion

Intensive Livestock Production

Adv	Disadv
Ø  ↑y__ (↑e__; optimised) Ø  E__ to manage (↓land needed) Ø  ↑p__ (cheaper; automation)	Ø  Soil e__ (overgrazing grass) Ø  ↑risk of d__ (animals kept close) Ø  E__

yield, efficient, ez, profit, erosion, disease, eutrophication

Habitat destruction
> h__ can have __ve impacts on h__ by a__ food w__/chains

humans, -, habitats, altering, webs

Biodiversity

# of diff species living in an area

Reasons for habitat destruction
1. ↑a__ for h__; crops, livestock production
2.  E__ natural r__
3. Marine p__

area, housing, extracting, resources, pollution

Undesirable Effects of Deforestation

Effect	Why
↓b__	↓# of d__ species
E__	Loss of h__
L__ of soil	R__ prevent loss of soil in w__ weather ↓plants = ↑soil e__
F__	↓trees = ↓w__ uptake by trees = flooding
↑__ in atmosphere	↓trees = ↓p__ = ↓CO2 in trees

biodiversity, diff, extinction, habitat, loss, roots, wet, erosion, flooding, water, CO2, photosynthesis