End Of Unit Questions Flashcards Preview

GCSE Biology 2.2 Organisms in the Environment > End Of Unit Questions > Flashcards

Flashcards in End Of Unit Questions Deck (10)
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1
Q

What is the result of the iodine test for starch?

A

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

2
Q

What is the word equation for photosynthesis?

A

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

3
Q

Give three physical factors which affect the distribution of plants

A
Any from 
•temp
•nutrients
•water
•oxygen 
•carbon dioxide 
•light
4
Q

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

A

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

5
Q

What is meant by the term limiting factor in photosynthesis?

A

Factors that may slow down the rate of photosynthesis

6
Q

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

A

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

7
Q

What is the difference between the mean and the median?

A

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

8
Q

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

A

There are so many variables that are difficult to control

9
Q

What is meant by the term reproducible results?

A

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

10
Q

Name the solution used to test a leaf for starch

A

Iodine solution