SECTION A

Question

QUESTION 1 [15 marks]
1.1 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 (1.1.1 to 1.1.3), for example, 1.1.3. E
Question 1.1.1 [2 marks]
The hormone aldosterone regulates the concentration of …
A waste substances
B glucose
C sodium ions
D carbonate ions
Question 1.1.2 [2 marks]
Which ONE of the following substances is excreted by the skin, lungs and
kidneys?
A urea
B uric acid
C water
D carbon dioxide
Question 1.1.3 [2 marks]
Which ONE of the following represents density-dependent and
density-independent factors respectively?
Density-dependent factors Density-independent factors
A Disease and competition Flood and drought
B Fire and flood Food supply and predation
C Food supply and disease Competition and predation
D Competition and fire Flood and drought
Question 1.2
Give the correct biological term for each of the following descriptions.
Write only the term next to the question number (1.2.1–1.2.5).
Question 1.2.1 [1 mark]
The control of water content in the blood
Question 1.2.2 [1 mark]
Movement of individuals of a population out of a habitat
Question 1.2.3 [1 mark]
The blood vessel that carries oxygenated blood filled with waste to the kidney
Question 1.2.4 [1 mark]
A triangular box that is made of cartilage and contains the vocal cords
Question 1.2.5 [1 mark]
The common name for a condition known as allergic rhinitis
Questions 1.3.1 and 1.3.2 (4 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. Only write A, B, BOTH
or NONE next to the question number (1.3.1–1.3.2).

Answer 1

Here are the answers to the questions in Section A:

Question 1.1.1
The hormone aldosterone regulates the concentration of …
C sodium ions

Question 1.1.2
Which ONE of the following substances is excreted by the skin, lungs and kidneys?
C water

Question 1.1.3
Which ONE of the following represents density-dependent and density-independent factors respectively?
D Competition and fire Flood and drought

Question 1.2.1
The control of water content in the blood
Osmoregulation

Question 1.2.2
Movement of individuals of a population out of a habitat
Emigration

Question 1.2.3
The blood vessel that carries oxygenated blood filled with waste to the kidney
Renal vein

Question 1.2.4
A triangular box that is made of cartilage and contains the vocal cords
Larynx

Question 1.2.5
The common name for a condition known as allergic rhinitis
Hay fever

Questions 1.3.1 and 1.3.2
(Note: Without the descriptions from Column I and Column II, I cannot provide answers for 1.3.1 and 1.3.2. If you provide those, I can help you with them as well.)