Singapore SEC G3 Biology free practice questions with answers
Read question 1 and its full worked answer from paper 1 of our 20-paper Singapore SEC G3 Biology set, then download the 4-page PDF. These are original practice questions, not official past papers. Page updated 3 November 2026.
Which type of cell has cilia, so that it sweeps mucus and trapped bacteria up and away from the lungs? [1 mark]
A Red blood cell
B Ciliated cell lining the trachea
C Guard cell
D Palisade mesophyll cell
Correct answer: B — Ciliated cell lining the trachea • A cell that has cilia, so that it sweeps mucus and trapped bacteria up and away from the lungs is the ciliated cell lining the trachea.
- Why the other options are wrong:
- A (Red blood cell): The red blood cell has no nucleus and contains haemoglobin, so that it carries more oxygen.
- C (Guard cell): The guard cell can change shape to open and close the stoma, so that it controls gas exchange and water loss.
- D (Palisade mesophyll cell): The palisade mesophyll cell contains many chloroplasts, so that it absorbs a lot of light for photosynthesis.
Specialised cells have structures that suit their function.
Your sample is downloading. Liked it? Singapore SEC G3 Biology Paper 1 is the full paper: Paper 1 with 40 multiple-choice questions (40 marks) and Paper 2 (80 marks): Section A structured questions, Section B a choice of one from two free-response questions; no practical Paper 3, with a worked solution for every question.
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Questions about this sample
What is in the Singapore SEC G3 Biology free sample?
The first 3 questions from paper 1 of the set, in the real exam layout, followed by the step-by-step worked answers. It is a 4-page PDF; this page shows question 1 with its answer.
How many full Singapore SEC G3 Biology papers are there?
20 original papers for Singapore secondary students preparing for SEC G3 Biology (K325) from 2027. Each is Paper 1 with 40 multiple-choice questions (40 marks) and Paper 2 (80 marks): Section A structured questions, Section B a choice of one from two free-response questions; no practical Paper 3, with a worked solution for every question. Papers start at A$11.99 and download instantly as a PDF.
Are these official past papers?
No. The sample is taken from our own original practice paper and is not an official past paper or affiliated with any exam authority.