Chapter 2 - Organisms In The Environment

Question 1

What does the iodine test, test for

Answer 1

Starch

Question 2

What is a limiting factor

Answer 2

Anything that reduces the optimum rate of photosynthesis

Question 3

What three things may the glucose produced by photosynthesis be used for

Answer 3

• respiration
• to produce proteins
• converted into insoluble starch for respiration

Question 4

Why may nitrate ions be added to the soil

Answer 4

To ensure that plants can make the proteins needed for healthy growth

Question 5

What physical factors may affect the distribution of organisms

Answer 5

• temperature
• availability of nutrients
• amount of light
• availability of water
• availability of oxygen
• availability of carbon dioxide

Question 6

2 ways quantitative data can be obtained:

Answer 6

• Random sampling using a quadrat

* Sampling along a transact

Question 7

What is a quadrat

Answer 7

A square frame placed randomly in a field to estimate the number of something, e.g plants

Question 8

What is a transect

Answer 8

It is not random. A line is marked between two points. Quadrat can be placed every five metres along line. Gives information about habitat and organisms in it

Question 9

How can you make an investigation valid

Answer 9

• Check results to make sure they are reproducible

* Have another person repeat investigation to make sure it’s reproducible

Question 10

What is the equation for photosynthesis

Answer 10

Carbon dioxide + water —> glucose + oxygen