unit 3 KA1 - food supply, plant growth, and productivity

Question 1

what is meant by food security

Answer 1

the ability of human populations to access food of sufficient quality and quantity

Question 2

what is meant by access to food

Answer 2

people must have economic means to obtain the available food

Question 3

what is meant by food quantity

Answer 3

sufficient food must be available at all times

Question 4

what is meant by food quality

Answer 4

food is sufficiently nutritious and varied to provide a balanced diet

Question 5

why has there been demand for increased food production

Answer 5

the increase in the human population and concern for food security leads to a demand for increased food production

Question 6

what should food production be

Answer 6

• sustainable

- not degrade the natural resources on which agriculture depends

Question 7

what does agricultural production depend on

Answer 7

the factors that control photosynthesis and plant growth.

Question 8

what are plant crop examples

Answer 8

cereals, potato, roots and legumes

Question 9

what are factors that control plant growth

Answer 9

• breeding of higher yielding cultivars
• use of fertilister
• protecting crops from pests with pesticides
• protecting crops from diseases and competition with herbicides and fungicides

Question 10

is the area to grow crops infinite or is it limited

Answer 10

the area to grow crops is limited

Question 11

what is all food production unltimately dependent on

Answer 11

photosynthesis

Question 12

what do breeders seek to develop

Answer 12

they seek to develop crops with higher nutritional values, resistence to pests and diseases, physical characteristics suited to rearing and harvesting as well as those that can thrive in particular environmental conditions

Question 13

which produce less food per unit area - livestock produce or crop plants? why?

Answer 13

livestock produce due to the loss of energy between trophic levels

Question 14

when is livestock production often possible

Answer 14

in the habitats that are unsuitable for growing crops

Question 15

how is energy lost in a food chain

Answer 15

movement, heat, faeces

Question 16

what proportion of energy is lost between trophic levels

Answer 16

90%

Question 17

does arable land produce more food when planted with crops or with grass to feed livestock. therefore which lands are more suitable for growing grass for livestock.

Answer 17

when planted with crops. this is why it is efficient to use lands unsuitable for growing crops for livestock.