VQUESTION 1

Question

Question 1.1 [20 marks]
Multiple Choice Questions: Various options are provided as possible answers to
the following questions. Choose the correct answer and write only the letter (A
to D) next to the question number.
Question 1.1.1 [2 marks]
In most stable freshwater environments, populations of Daphnia are almost
entirely female and reproduce asexually. However, males are observed in
low-oxygen environments or when food is scarce.
Based on these observations, a researcher suggests that male Daphnia develop
in response to unfavourable environmental conditions.
This is an example of a …
A. Procedure
B. Theory
C. Hypothesis
D. Result
4
Question 1.1.2 [2 marks]
Name the phylum to which the organism below belongs:
Figure 1: Diagram of an organism
A. Annelida
B. Cnidaria
C. Arthropoda
D. Chordata
Question 1.1.3 [2 marks]
Dermacentor variabilis is a tick species of dog. Which combination correctly
shows the phyla to which the parasite and host species belong?
Dermacentor Dog
A Arthropoda Arthropoda
B Arthropoda Chordata
C Platyhelminthes Chordata
D Platyhelminthes Arthropoda
5
Question 1.1.4 [2 marks]
Which one of the following is NOT a characteristic of Porifera?
A. sessile
B. lack true tissue
C. symmetrical
D. asexual
Question 1.1.5 [2 marks]
The death rate is……
A. mortality
B. natality
C. immigration
D. emigration
Question 1.1.6 [2 marks]
Natural causes of death include…..
A. old age
B. parasitism
C. commensalism
D. mut
Question 1.1.7 [2 marks]
Which is an indirect counting technique?
A. aerial photography
B. counting
C. census
D. quadrat
6
Question 1.1.8 [2 marks]
Study the population pyramid below:
Figure 2: Population pyramid
Which of the following is an incorrect interpretation of the population above?
A. Declining population; characteristic of a developing country
B. Rapidly growing population; characteristic of a developing country
C. More females live to old age than males.
D. There is a high natality rate.
Question 1.1.9 [2 marks]
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. Interspecific competition
B. Intraspecific competition
C. Altruism
D. Territoriality
7
Question 1.1.10 [2 marks]
One of the species benefits and the other is harmed.
A. parasitism
B. commensalism
C. mutualism
D. communism
TOTAL: [2 x 10 = 20]
Question 1.2 [5 marks]
Give the correct biological term for each of the following descriptions. Write only
the term next to the question number.
Question 1.2.1 [1 mark]
The movement of individuals into a habitat.
Question 1.2.2 [1 mark]
The method used by governments to count how many people are in their
country.
Question 1.2.3 [1 mark]
When every individual in a population dies and the species is wiped out.
Question 1.2.4 [1 mark]
A relationship between two organisms that live together for the benefit of one or
both of the organisms.
8
Question 1.2.5 [1 mark]
The birth rate of a population.
TOTAL: [1 x 5 = 5]
Question 1.3 [10 marks]
Indicate whether each of the descriptions in Column I applies to A ONLY, B
ONLY, BOTH A and B or NONE of the items in Column II. Write A only, B only,
both A and B or none next to the question number.
Column I Column II
1.3.1 Organisms that feed on dead organic
matter.
A: Decomposers
B: Saprophytes
1.3.2 A group of organisms capable of
interbreeding and producing fertile offspring.
A: Species
B: Community
1.3.3 Organisms that cause diseases. A: Pathogenic
B: Generic
1.3.4 Which of the following is not part of the
pistil?
A: Filament
B: Stigma
1.3.5 Sponges are typically…. A: Mobile
B: Anaerobic
TOTAL: [2 x 5 = 10]
9
Question 1.4 [15 marks]
Figures A, B and C represent different phyla of animals.
Figure 3: Different phyla of animals
Question 1.4.1 [3 marks]
Identify the phylum represented in figures A, B and C. Write the letter with the
correct phylum.
Question 1.4.2 [1 mark]
What type of symmetry does Figure A have?
Question 1.4.3 [1 mark]
Give one benefit of the type of symmetry mentioned in 1.4.2.
Question 1.4.4 [6 marks]
Define the following terms:
a) Cephalisation
b) Triploblastic
c) coelom
10
Question 1.4.5 [4 marks]
Draw a diagram of a cross-section of a diploblastic body plan labelling each
tissue layer.

Answer 1

Here are the answers to your questions:

Question 1.1 [20 marks]

Question 1.1.1 [2 marks]
Answer: C (Hypothesis)

Question 1.1.2 [2 marks]
Answer: C (Arthropoda)

Question 1.1.3 [2 marks]
Answer: B (Arthropoda Chordata)

Question 1.1.4 [2 marks]
Answer: C (symmetrical)

Question 1.1.5 [2 marks]
Answer: A (mortality)

Question 1.1.6 [2 marks]
Answer: A (old age)

Question 1.1.7 [2 marks]
Answer: A (aerial photography)

Question 1.1.8 [2 marks]
Answer: A (Declining population; characteristic of a developing country)

Question 1.1.9 [2 marks]
Answer: B (Intraspecific competition)

Question 1.1.10 [2 marks]
Answer: A (parasitism)

Question 1.2 [5 marks]

Question 1.2.1 [1 mark]
Answer: Immigration

Question 1.2.2 [1 mark]
Answer: Census

Question 1.2.3 [1 mark]
Answer: Extinction

Question 1.2.4 [1 mark]
Answer: Symbiosis

Question 1.2.5 [1 mark]
Answer: Natality

Question 1.3 [10 marks]

1.3.1
Answer: both A and B

1.3.2
Answer: A only

1.3.3
Answer: A only

1.3.4
Answer: A only

1.3.5
Answer: B only

Question 1.4 [15 marks]

Question 1.4.1 [3 marks]
(Answers will depend on the figures provided, please provide them for accurate identification.)

Question 1.4.2 [1 mark]
(Answer will depend on the figure, typically "Radial" or "Bilateral".)

Question 1.4.3 [1 mark]
(Answer could be: "It allows for more efficient movement and sensory perception.")

Question 1.4.4 [6 marks] a) Cephalisation: The concentration of sensory organs and nerve cells at the anterior end of an organism, leading to the development of a head. b) Triploblastic: An organism having three germ layers: ectoderm, mesoderm, and endoderm, which give rise to all organs and tissues. c) Coelom: A fluid-filled body cavity that is completely lined by mesoderm, allowing for the development of complex organs.

Question 1.4.5 [4 marks]
(Drawing: You need to sketch a simple diagram showing the outer layer (ectoderm), middle layer (mesoderm), and inner layer (endoderm), labeling each layer appropriately.)

If you have specific figures or more details for Question 1.4, please share them for more accurate answers.