Distribution of organisms

Question 1

Why do organisms live in different places?

Answer 1

Because the environment varies.

Question 2

What is a HABITAT?

Answer 2

Place where an organism lives.

Question 3

What is the distribution of an organism?

Answer 3

Where an organism is found.

Question 4

Where an organism is found its affected by?

Answer 4

Environmental factors.

Question 5

Name 5 environmental factors?

Answer 5

Temperature.
Availability of water.
Availability of carbon dioxide/oxygen.
Availability of nutrients.
Amount of light.

Question 6

Why might one organism be more common in one area than another?

Answer 6

Due to differences in environmental factors.

Question 7

What ways can you study the distribution of an organism?

Answer 7

Transect.

Quadrats.

Question 8

What does a quadrat tell you?

Answer 8

How common an organism is in two sample areas and then compare them.

Question 9

What does a transect tell you?

Answer 9

The distribution of organism change across an area.

Question 10

What type of organisms do quadrats study?

Answer 10

Small.

Question 11

What is a quadrat?

Answer 11

Square frame enclosing a known area.

Question 12

First step on how to use a quadrat?

Answer 12

Place 1m2 quadrat on the ground at a random point within the first sample area.

Question 13

Second step on how to use a quadrat?

Answer 13

Count all the organisms within the quadrat.

Question 14

Third step on how to use a quadrat?

Answer 14

Repeat steps 1 and 2 as many times as you can.

Question 15

Fourth step on how to use a quadrat?

Answer 15

Work out the mean number of organisms per quadrat.

Question 16

Fifth step on how to use a quadrat?

Answer 16

Repeat steps 1 to 4 in a second sample area.

Question 17

Final step on how to use a quadrat?

Answer 17

Compare the two means.

Question 18

How do you work out the population size?

Answer 18

Work out mean number of organisms per m2.

Multiply mean by the total area of the habitat.

Question 19

Use transects to study the distribution of organisms…

Answer 19

Along a line.

Question 20

First step on how to use a transect?

Answer 20

Mark out a line in an area you want to study.

Use tape measure.

Question 21

Second step on how to use a transect?

Answer 21

Collect data along the line.

Question 22

How do you count all the organisms along the line?

Answer 22

Counting all the organisms interested in that touch the line.

Question 23

How else can you collect data with a transect?

Answer 23

By using a quadrat.

Question 24

How do quadrats work with transects?

Answer 24

Placing quadrat next to or along the transect line.

Do this in intervals.

Question 25

Transects can be used in any?

Answer 25

Eco system.

Question 26

When collecting environmental data think about what 2 things?

Answer 26

Reliability.

Validity.

Question 27

Make sure your results are?

Answer 27

Repeatable.

Reproducible.

Question 28

How can you make your results more reliable?

Answer 28

Take a larger sample.

Question 29

For your results to be valid they must be?

Answer 29

Reliable.

Question 30

Name 2 things to do to keep results valid?

Answer 30

Control variables.

Use random samples.