B2b-energy flow Flashcards

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1
Q

what is a trophic level?

A

a feeding level

Position occupied by a group of organisms in a food chain

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2
Q

What is a producer?

A

Organisms that make their own food

Eg lettuce -sunlight

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3
Q

What is a primary consumer?

A

Eat consumers

First consumers

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4
Q

What is a secondary consumer?

A

Eat first consumers

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5
Q

What does a pyramid of biomass show?

A

Shows the mass of living material at each stage of the food chain

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6
Q

Why is it difficult to measure dry biomass?

A

You have to kill the organism first to dry out all the water

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7
Q

Why is it difficult to construct an accurate pyramid of biomass?

A

Some organisms feed at more than one trophic level

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8
Q

Why can pyramids of biomass and pyramids of numbers be different shapes?

A

Pyramids of biomass mostly pyramid shape

Pyramid of numbers-number of organisms

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9
Q

How does energy from the sun flow through food webs?

A

Plants use some light energy from sun to make food

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10
Q

What is egestion?

A

When food that can’t be digested passes out as faeces

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11
Q

How is energy or material lost at each stage?

A

Respiration
Energy lost as heat to surroundings
Excretion
Egestion

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12
Q

What happens to waste products and uneaten parts?

A

They can become starting points for other food chains

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13
Q

Why do most food chains have no more than five trophic levels?

A

Material and energy lost at each stage of food chain

Not enough energy to support more organisms

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14
Q

What is the efficiency of energy transfer?

A

How good it is at passing on energy from one level to the next

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