22- Humans and the environment Flashcards Preview

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Flashcards in 22- Humans and the environment Deck (42)
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1

how can food production be increased

1- using agriculture machinery
2- using agriculture chemicals (fertilizers, insecticides, herbicides)
3- selective breeding

2

examples of agriculture machinery

tractors- to cultivate larger area in shorter time

3

fertilizers

add more mineral ions (nitrate ions)

4

insecticides

sprayed on crop to kill insects that reduce yield or make it look less appealing

5

herbicides

sprayed to kill weeds, which compete with the crop plant to their growth

6

monoculture

growing crop plants of the same variety in a large area

7

negative impacts of monoculture

1- low biodiversity
2- only few species can live where crop is growing
3- increases the pest population on the crop
4- insecticides may kill harmless insects too

8

solutions to negative impact of monoculture

1- using mixed culture to decrease insect spread
2- using methods other than insecticides to control insects pests.

9

negative impacts of intensive livestock production

1- diseases may spread easily
2- increase risk of having bacteria resistant to antibiotics
3- the waste can pollute the area nearby

10

why do some parts of the world not have enough food

1- unequal distribution of food in the planet
2- high food prices that some people cant afford
3- famine can happen due to natural disasters or wars or diseases.

11

reasons for habitat destruction

1- increased area for human benefits (crop, roads, house)
2- mining for natural resources
3- marine pollution that kills aquatic organisms

12

deforestation

cutting down of large number of trees

13

effects of deforestation

1- extinction of some species
2- flooding due to soil erosion
3- climate change, as reduces rainfalls
4- increase CO2 in the air, causing global warming
5- local people loose their homes

14

dangers of non-biodegradable plastics

1- turtles mistake it for jellyfish and eat it
2- it traps animals and may kill them

15

female contraceptive hormones

- hormones excreted in urine then becomes sewage
- they can effect fish by preventing their male hormone (testosterone) from working
- makes fish produce less sperms or change to female

16

nuclear fallout

accidents releasing radioactive substances into the air

17

effects of exposure to radioactive substances

- radiation sickness and burns
- DNA mutation, lead to cancer

18

why does exposure to radioactive substances effect us

ionizing radiation damages DNA

19

alpha

the most ionizing radiation, causing most damage if penetrates the body

20

pesticides

chemicals use to kill organisms that damage crop
(insecticides, fungicides...), and to control transmit disease (mosquitoes)

21

cause if water pollution

discharge of chemical waste into water

22

DDT

a pesticide to kill insects, but doesnt break down and remains in them and the soil, where other animals eat those insects and get harmed

23

cause of acid rain

sulfur dioxides and nitrogen oxides from burning fossil fuels dissolve in water making carbonic acid which turns into acid rain

24

effects of acid rain

1- damage and kill plants
2- seeps to soil and washes out ions
3- kill aquatic animals
4- damage vehicles and buildings (limestone)

25

solution for acid rain

1- cut down emission of sulfur dioxides and nitrogen oxides
2- use renewable energy
3- use catalytic converter in cars

26

greenhouse effect

CO2 trapping some of the infrared radiations transmitted from the sun to keep the earth warm

27

enhanced greenhouse effect

trapping more infrared radiations due to the increase of CO2 in the air, causing global warming

28

sustainable resources

resources which can be removed from the environment without running out (wood for fuel)

29

sustainable development

providing for the needs of an increasing human population without harming the environment

30

recycling glass

- crushing used glass
- melting it at high temperature
- use to make new glass objects