Food Production Flashcards

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1
Q

Why is there a need for increased food yield?

A

Increasing human population

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2
Q

Name the chemicals that contain nitrates that increase crop yield.

A

Fertilisers

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3
Q

Name the chemicals that can kill plants and animals which reduce crop yield.

A

Pesticides

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4
Q

What do plants use nitrates to make?

A

amino acids - protein

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5
Q

How do animals obtain protein and amino acids?

A

eating plants

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6
Q

How does fertiliser affect algal growth?

A

Increases it

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7
Q

How does algal bloom affect light levels for aquatic plants?

A

reduces it

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8
Q

How does reduced light levels affect aquatic plants?

A

kills them

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9
Q

How does increased dead plants affect the number of bacteria?

A

increases them

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10
Q

How does an increase in bacteria affect oxygen levels in the water?

A

decreases it

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11
Q

How does decreased oxygen levels in the water affect fish?

A

increased death rate (boo hoo)

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12
Q

If pesticides are used what happens to the levels of toxicity as you move along a food chain?

A

it increases

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13
Q

What name is given to the build up of toxic substances in living organisms as it passes through the food chain?

A

bioaccumulation

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14
Q

State 2 alternatives to pesticides and fertilisers.

A

GM crops or biological controls

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15
Q

What name is given to the use of a natural predator to keep numbers of an organism down?

A

Biological control

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