Feeding the Billions

Question 1

state some uses of Plants

Answer 1

they provide food,medicine,materials for clothing

Question 2

can you name the type of organisms at the start of a food chain

Answer 2

called producers,these are organisms such as plants

Question 3

suggest why there may be a food crisis in terms of the world population and world food production

Answer 3

the world population is growing rapidly an as more people need to be fed it puts a strain on food production.

Question 4

suggest ways the world population could be fed in the future

Answer 4

1.improving agricultural practices

2.promoting research and innovation

3.reducing food waste

4.enhancing access to education and resources

5.supporting sustainable fishing practices

Question 5

Name the raw materials for photosynthesis.

Answer 5

Carbon dioxide and water

Question 6

Name the requirements for photosynthesis

Answer 6

Chlorophyll sunlight

Question 7

Name the product of photosynthesis

Answer 7

Oxygen and glucose (sugar)

Question 8

Name the green pigment found in leaves

Answer 8

Chlorophyll

Question 9

Write the equation for photosynthesis

Answer 9

Done on paper

Co2 plus water chlorophyll over sunlight to oxygen plus glucose

Question 10

Describe what the main product of photosynthesis can be used for

Answer 10

Can be used by the plant to make energy and can also be built up and stored as starch

Question 11

Name the indicator used to test for starch and describe the colour change

Answer 11

Iodine should go from brown to black colour

Question 12

Explain each stage in the testing a leaf for starch process

Answer 12

1 cut off a piece of leaf

2.boil piece of leaf in water for 5 minutes

3.place a test tube filled with alcohol into the hot water.place the peace of leaf into the alcohol for 5 minutes

4.wash piece of leave in water

5.place piece of leaf on a simple tray and add 2 or 3 drops of iodine

Question 13

Name sown factors that limit how much photosynthesis plants do in a greenhouse

Answer 13

Light intensity and carbon dioxide concentration water levels

Question 14

Explain how farmers can overcome these limiting factors

Answer 14

Add light bulbs,for carbon dioxide they can pump it in from a power plant, for water levels they use sprincelers

Question 15

Name some factors that limit how much photosynthesis plants do in a field

Answer 15

Crop plants compete with eachother for water light intensity and nutrients

Question 16

Explain how these farmers can overcome these limiting factors in a field

Answer 16

Innovate the crops with water add fertilizer and make sure to sow the seeds small distance apart from eachother

Question 17

Name 2 sources of nutrients that farmers use for their stop plants

Answer 17

Manour and artificial fertilizer

Question 18

Identify independent and dependent variables in an experiment

Answer 18

For starch same volume of water alcohol size of leave basically things that would get your answer to the same point unless something is wrong

Question 19

Name 3 chemical elements required for healthy plant growth

Answer 19

Nitrogen, phosphorus and potassium

Question 20

Describe symptoms of plants growing without each particular element.

Answer 20

• if there is no nitrogen there will be poor leaf growth

-if there is no phosphorous there will be little root growth

-if there is no potassium there will be little flower/fruit growth

Question 21

Explain what plants need each of these 3 elements

Answer 21

-plants need nitrogen for leaf growth

-plants need phosphorous for root growth

-plants need potassium for flower/fruit growth

Question 22

state the meaning of the term ‘deficiency symptom’

Answer 22

the symptoms that plants show when they do not have enough of a particular nutrient/element are known as deficiency symptoms.

Question 23

name the elements contained in fertilisers

Answer 23

• nitrogen,phosphorous,potassium

Question 24

Identify the main element each type of crop plant needs.

Answer 24

Example - The potato plant grows potatoes at its roots. Phosphorus is good for root growth.

Question 25

State the meaning of food security.

Answer 25

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

Question 26

Identify aspects of food security in different countries.

Answer 26

- Scotland has a slight food security problem as some people do not have enough money to access food (can use food banks) - India has a food security problem as they lack money and lack quantity and possibly quality of food. - China has a food security problem as they lack money and lack quantity and possibly quality of food. - USA has a slight food security problem as some people lack money. Some people do have money but eat poor quality food.

Question 27

Describe the role of fertilisers in food security.

Answer 27

Helps improve crops by adding the necessary nutrients

Question 28

Describe the role of pest control in food security.

Answer 28

Helps reduce pests from damaging crops

Question 29

Name types of chemicals used in pest control.

Answer 29

herbicides (to kill weeds), insecticides (to kill insects) and fungicides (to kill fungi) on the crop plants.

Question 30

State what biological control is.

Answer 30

It is where living things are used to remove pests e.g. grow flowering plants on the field perimeter to attract predators of insect pests into the crop field.

Question 31

Describe the role of plant genetics (genes) in food security.

Answer 31

Sometimes a plant’s genes limit the plant’s growth. Therefore it will limit how much crop could be grown

Question 32

Name the two methods of genetically changing crop plants.

Answer 32

Selective breeding and genetically modified crops