key area 3.1 - food supply Flashcards
1
Q
food security
A
- the ability of a human population of access food of sufficient quality and quantity
2
Q
factors which impact food production
A
- photosynthesis
- competition
- breeding higher yielding cultivars
- disease
- pests
- soil nutrients and profile
- fertilisers
3
Q
ways to improve crop yield
A
- reducing competition : add nutrients and water to the soil to reduce factors which may limit plant growth
- using higher yielding cultivars, selectively bred or GM
- developing pest resistant crop plants
4
Q
how much energy is lost between tropic levels in a food chain
A
- 90% due to undigestes waste, maintaining body temperature and movement
- (10% moves on)
5
Q
what is the most productive land use for producing food
A
- plants produce more food per unit area of land than livestock since energy is lost between trophies levels
6
Q
what do breeders want when developing crops
A
- higher nutritional value
- resistance to pest and disease
- physical characteristics suited to rearing and harvesting
- those that can thrive in particular environmental conditions
7
Q
examples of plant crops
A
- legumes and root crops
