National 5 Biology
Unit 3 – Life on Earth
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Teacher: ___________________________________
National 5
Unit 3: Life On Earth
Homework Booklet
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HW
No DUE
TOPIC MARK % COMMENT
1 Biodiversity and the dis-
tribution of life
9
2 Energy in Ecosystems
15
3
Sampling techniques,
and measurement of
abiotic and biotic factors
9
4 Adaptation, natural se-
lection
8
5 Human impact on the
environment 8
4.
5. The diagram below shows the number of organisms at each level in a pyramid of numbers.
How many organisms are consumers?
A 2
B 82
C 6000
D 6082
4. Some of the characteristics of five related British plants are shown in the table.
Use the information to answer questions 1 and 2.
Species Thorns Flower Colour Number of Petals
Pear No White Five
Silverweed No Yellow Five
Trailing Rose Yes White Five
Dog Rose Yes White tinged with
pink
Five
Common Tormentil No Yellow Four
KEY TO FIVE RELATED BRITISH PLANTS
Clue 1 Thorns present go to Clue 2
Thorns not present go to Clue 3
Clue 2 …………………………….Trailing Rose
…………………………….Dog Rose
Clue 3 5 petals present go to Clue 4
4 petals present …………...Tormentil
Clue 4 …………………………….Pear
…………………………….Silverweed
Use the following paired statements to answer questions 1 and 2.
A White flowers
Yellow flowers
B White flowers
White flowers tinged with pink
C 4 petals
5 petals
D White flowers
Yellow flowers
1. Which is the correct pair of statements for Clue 2 ? _______
2. Which is the correct pair of statements for Clue 4 ? _______
1
1