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Biology > Topic 4- Sampling Techniques And Measuring Abiotic And Biotic Factors > Flashcards

Topic 4- Sampling Techniques And Measuring Abiotic And Biotic Factors Flashcards

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0
Q

What animals are found in pitfall traps?

A

Insects
Woodlice
Ants
Animals that move along the ground

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1
Q

Why do we have to use quadrats and pitfall traps to count organisms?

A

It would be impossible to count all the individuals in many ecosystems
We have to sample from a whole group and estimate

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2
Q

What animals would not be trapped by pitfall traps?

A

Spiders
Flying insects
Jumping insects

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3
Q

What would be the reason for finding more predators in a trap then prey?

A

The predators could have eaten the prey or the predators move around more

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4
Q

Why is a lid placed on top of a pitfall trap?

A

So birds ect can’t get into the trap

It stops the rain from getting in and drowning what’s inside

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5
Q

Why does the trap need to be exactly level with the soil?

A

So animals can just fall in

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6
Q

What a quadrats used to measure?

A

Abundance if plants

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7
Q

What must you do to the quadrat to give a valid result?

A

Throw it randomly

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8
Q

What happens when a plant covers more than one quadrat square?

A

Only count it once

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9
Q

What are biological keys used for?

A

Helps identify organisms

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10
Q

What are biotic factors?

A

A living factor which effects organisms

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11
Q

What is an abiotic factor?

A

A non living factor which effects organisms

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12
Q

What do we use a light metre for?

A

Measuring light intensity

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13
Q

What do we use to measure pH?

A

A pH metre

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14
Q

What do we use a moisture metre for?

A

Soil moisture

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15
Q

What do we use to measure temperature?

A

A thermometer

16
Q

Why do we need to make sure that we don’t shade a light meter?

A

This will block the light you are measuring

17
Q

Why do we have to point the light meter in the same direction?

A

Because of the positioning of the sun

18
Q

Why can’t you take a measurement when it’s sunny and the next when it is cloudy?

A

The clouds will block the sunlight you are measuring

19
Q

How can you avoid getting the wrong result when using a pH meter?

A

Thoroughly cleaning the probes so you don’t cross contaminate and transfer the pH

20
Q

What 2 things could change soil moisture?

A

Precipitation

Drainage

21
Q

How can you avoid getting the wrong result when using a moisture meter?

A

Making sure you don’t crops contaminate the probes an transfer moisture

22
Q

Name 11 abiotic factors

A 
Soil moisture
Carbon dioxide level
Nitrate content of soil
Oxygen concentration
River flow speed 
pH
Temperature
Phosphate concentration
Wind speed
Rainfall
Air humidity
23
Q

Name 6 biotic factors

A 
Competition
Predication
Parasitism
Availability of food
Disease
Grazing

Biology (14 decks)

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