CONTENTS Exam Tips
i
Mock exam
1
Mock exam memo
14
November 2011 exam
22
November 2011 memo
40
November 2010 exam
50
November 2010 memo
57
Feb/March 2010 supplementary exam
63
Feb/March 2010 memo
70
November 2009 exam
74
November 2009 memo
80
Feb/March 2009 supplementary exam
86
Feb/March 2009 memo
92
November 2008 exam
97
November 2008 memo
105
Exam Timetable
111
a
LIFE SCIENCES PAPER 2
MOCK EXAM
LIFE SCIENCES PAPER 2: MOCK EXAM © EDUCATIONAL IMPROVEMENT AND STUDY HELP (THE EISH-TEAM)
QUESTION PAPER
LIFE SCIENCES MOCK EXAM PAPER TWO MARKS: 150
MARKS: 150
TIME: 2.5 hours
TIME: 2½ hours INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1.
Answer ALL the questions.
2.
Write ALL the answers in the ANSWER BOOK.
3.
Start EACH question on a NEW page.
4.
Number the answers correctly according to the numbering system used in this question paper.
5.
If answers are NOT presented according to the instructions of each question, candidates will lose marks.
6.
ALL drawings should be done in pencil and labelled in blue or black ink.
7.
Draw diagrams and flow charts ONLY when requested to do so.
8.
The diagrams in this question paper may NOT necessarily be drawn to scale.
9.
The use of graph paper is NOT permitted.
10.
Non-programmable calculators, protractors and compasses may be used.
11.
Write neatly and legibly.
1 SECTION A
9.
The use of graph paper is NOT permitted.
10.
Non-programmable calculators, protractors and compasses may be used.
11.
Write neatly and legibly.
LIFE SCIENCES PAPER 2 • MOCK EXAM
SECTION A QUESTION 1 1.1
Various possible options are provided as answers to the following questions. Choose the correct answer.
1.1.1
How does the female ovum differ from other cells in a woman’s body?
1.1.2
A.
The ovum has twice as many chromosomes as all other cells.
B.
The ovum has 23 more chromosomes than all other cells.
C.
The ovum has 23 less chromosomes than all other cells.
D.
There are 46 chromosomes in the ovum.
Four species of small mammals were studied in their natural environment and were found to have the following food preferences, habitats and shelter requirements:
Which two species would be most likely to compete with each other much of the time? A. I and III B.
I and II
C.
III and IV
D.
II and IV
NOTES: ___________________________________________________________________________ 1.1.3 An aphid is a small insect that sucks sugars from plant stems. The graphs below show the effectiveness ___________________________________________________________________________ of four different biological control organisms (A, B, C and D), used to control the population of a species of aphid in a particular area. The control organisms were released during the first summer of a number ___________________________________________________________________________ of years. Study the graphs and then select the biological control organism (A, B, C or D) that would be ___________________________________________________________________________ most suitable to control the aphid. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ 2 ___________________________________________________________________________
B.
I and II
C.
III and IV
LIFE SCIENCES PAPER 2 • IV MOCK EXAM D. II and
1.1.3
An aphid is a small insect that sucks sugars from plant stems. The graphs below show the effectiveness of four different biological control organisms (A, B, C and D), used to control the population of a species of aphid in a particular area. The control organisms were released during the first summer of a number of years. Study the graphs and then select the biological control organism (A, B, C or D) that would be most suitable to control the aphid.
1.1.4
Which of the following is a density–independent factor in population regulation? A. severe frost B.
predation
C.
territoriality
D.
disease
3
LIFE SCIENCES PAPER 2 • MOCK EXAM
1.1.5
1.1.6
Male weaver birds build the nests. The females choose their mate according to how good the male's nest and courtship display is. What is this an example of? A. Intra-specific competition B.
Inter-specific competition
C.
Altruism
D.
Territoriality
Which of the following is not a strategy for survival in lions? A. mothers look after their young B.
litters are large
C.
lion prides hunt in specific territories only
D.
family groups stay together and hunt together [6 x 2 = 12]
1.2
Give the correct biological term for each of the following descriptions.
1.2.1
The structure that the plant ovary develops into which will protect and aid with seed dispersal.
1.2.2
The process whereby egg cells are produced in the ovary.
1.2.3
The name given to the parameter concerned with the number of babies born in a population.
1.2.4
The method used by governments to count how many people are in their country.
1.2.5
This happens when every individual in a population dies and the species is wiped out.
1.2.6
The process whereby an organism maintains a constant internal environment due to regulatory control mechanisms. [6]
1.3
Choose an item from Column B that matches a description in Column A.
COLUMN A 1. A description of a hormone 2. This gland is situated beneath the brain. 3. This hormone is associated with the 'fight or flight' response. 4. This organ contains exocrine and endocrine parts. 5. This type of gland secretes hormones into the blood stream.
4
COLUMN B A Endocrine gland B Oestrogen C Testosterone D Exocrine gland E Adrenaline F Pituitary G Pancreas H Chemical messenger [5]
LIFE SCIENCES PAPER 2 • MOCK EXAM
1.4
The diagram shows a human foetus in the uterus.
1.4.1
Provide labels for A, B and C.
[3]
1.4.2
What are the functions of A?
[2]
The table below shows the average number of cigarettes smoked each day by pregnant women and the average birth masses of their babies. A Average number of cigarettes smoked each day by pregnant women 0 10 20 30 40
B Average birth mass of their babies (in g) 3000 2990 2965 2910 2800
1.4.3
Which column, A or B, has the independent variable in it?
[1]
1.4.4
If you drew a graph using the data table, which column, A or B, would you put on the y-axis? [1]
1.4.5
Write a sentence describing the trend illustrated by the data in the table. [2]
1.4.6
If the trend illustrated by the table were to continue, predict the birth mass of a baby whose mother smoked 50 cigarettes a day while pregnant.
1.4.7
[2]
Name one other habit a pregnant woman might have that could harm her unborn baby. [1] [12]
5
LIFE SCIENCES PAPER 2 • MOCK EXAM
1.5
Complete the following table to compare the nervous and endocrine systems. Put a tick in each correct box for the features shown.
[5]
1.6
A scientist used 30 live traps to gather information about the population of the striped field mice in a 1 hectare wheat field. (A live trap catches the mice in a box. The mice are later released unharmed). During the first trapping night he caught 19 mice, which he marked by placing a dot of paint on their heads. He then released them into the field. Three days later he set his traps again and caught 22 mice, of which 3 had spots of paint on their heads. He used the formula:
to estimate the size of the population; where M = total number of animals in first marked sample S = total number of animals recaptured in second sample T = total number of marked recaptured animals 1.6.1
What is the name given to this kind of sampling?
[2]
1.6.2
What was the size of the mouse population in that one hectare?
[2]
1.6.3
Why did he use live traps?
[3]
1.6.4
Why would this investigation have been invalid if he had done the second sampling one month later, rather than three days later?
[3] [10]
SECTION A = 50
6