Chapter 1 Populations

Answers for the A2 textbook exam style questions

HideShow resource information
Preview of Chapter 1 Populations

First 267 words of the document:

Chapter 1
Answers Marks Examiner's tips
1 a) i) a group of organisms of the same 1
species living in the same
habitat / area
ii) reference to feeding role; 2 The niche of an organism refers to its
reference to habitat role / biotic role (what it feeds on and what
role determined by abiotic factors may feed on it) and its abiotic role
(where it lives in the habitat in terms of
the abiotic conditions it requires).
b) i) temperature and rainfall favourable / 1 A `physically hostile environment' will
high in tropical forest and have unfavourable abiotic conditions.
unfavourable / low in Arctic tundra
ii) diversity of organisms is usually low 2 max. Few species can survive in ecosystems
in arctic tundra and high in tropical where the abiotic factors are
forest; abiotic factors dominate unfavourable.
distribution / diversity / abundance
in arctic / have little affect in
tropical forest
2 a) mixes randomly / completely in 2 The method of marking should not
population; have an effect on the organisms in
marking is not toxic / does not wear off; terms of their survival or distribution
no migration / emigration / immigration; within the population.
no change in population size between
samples / life span longer than time
between release and recapture;
no births or deaths;
not trap-happy / trap shy
b) i) correct figures used in equation; 2 Correct answer = 2 marks.
ii) large sample more representative of 1 Reject accurate / statistically viable.
AQA Biology A2 level © Nelson Thornes Ltd 2009 1

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Chapter 1
Answers Marks Examiner's tips
3 a) i) more people survive to reproductive 1 max. Any suitable reason for an increase in
age; birth rate would be acceptable.
better pre-natal care / health care of
better nutrition of mother
ii) better nutrition; 1 max. Again any suitable reason for a
better sanitation; decrease in death rate would be
(widespread) introduction of health acceptable.…read more

Page 3

Preview of page 3

Here's a taster:

Chapter 1
Answers Marks Examiner's tips
5 a) interspecific competition 1 Interspecific competition is between
different species.
b) i) population declines as experimental 1 When both species are together the
area has higher number than control number of tree lizards declines, as
areas / reference to Figure 1 shown in Figure 1.…read more

Page 4

Preview of page 4

Here's a taster:

Chapter 1
Answers Marks Examiner's tips
ii) A Ranunculus bulbosus 1 The germination of the seedlings is
B Ranunculus acris dependent on the soil moisture.
C Ranunculus repens Ranunculus repens is most abundant in
the furrows where soil moisture is
highest. Ranunculus bulbosus is
abundant in the ridges where soil
moisture is lowest.
iii) breed together; 2 Organisms of the same species do
production of fertile offspring occupy the same ecological niche.…read more


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »