End Of Unit Questions

Question 1

What is the result of the iodine test for starch?

Answer 1

If iodine is present, the lead will turn blue/black

Question 2

What is the word equation for photosynthesis?

Answer 2

Carbon dioxide + water —(using light energy)—>oxygen + glucose

Question 3

Give three physical factors which affect the distribution of plants

Answer 3

Any from 
•temp
•nutrients
•water
•oxygen 
•carbon dioxide 
•light

Question 4

Why would there be little point in heating a greenhouse on a summers day?

Answer 4

It is hot enough anyway so it would be a waste of energy. Also the enzymes in the plant might denature if the temp gets too hot

Question 5

What is meant by the term limiting factor in photosynthesis?

Answer 5

Factors that may slow down the rate of photosynthesis

Question 6

How can you use a quadrat to make a line transect?

Answer 6

A line is marked between 2 points and then the quadrat is placed at regular intervals along the line, the organisms in the quadrats are counted

Question 7

What is the difference between the mean and the median?

Answer 7

The median is the middle result and the mean is the average of all the results totalled

Question 8

Why is it difficult to be sure n investigation in outdoor habitats is valid?

Answer 8

There are so many variables that are difficult to control

Question 9

What is meant by the term reproducible results?

Answer 9

If another person can do the same test and get the same results as you

Question 10

Name the solution used to test a leaf for starch

Answer 10

Iodine solution