B2.4 - Organisms And Their Environment

Question 1

What are the physical factors that affect organisms? (5)

Answer 1

1. Temperature.
2. Availability of water.
3. Availability of oxygen and carbon dioxide.
4. Availability of nutrients.
5. Amount of light.

Question 2

What is a quadrat?

Answer 2

A square frame enclosing a known area.

Question 3

Quadrant sampling is ___.

Answer 3

Random.

Question 4

What is a transect line?

Answer 4

A line along which you collect data.

Question 5

What makes an investigation reliable?

Answer 5

That it is repeatable and reproducible.

Question 6

How can you make your results more reliable? (2)

Answer 6

1. Take a larger sample size.

2. Use random samples.

Question 7

How can your results be made valid?

Answer 7

By controlling all the variables.