PSLE Science Biology Topics 2 — Questions and Answers
Question 1: What type of reproduction involves only one parent?
- Sexual reproduction
- Asexual reproduction (Correct answer)
- Cross-pollination
- Fertilisation
Correct answer: Asexual reproduction
Asexual reproduction involves only one parent and produces offspring that are genetically identical to the parent.
Question 2: Which of the following is a mammal?
- Crocodile
- Eagle
- Dolphin (Correct answer)
- Frog
Correct answer: Dolphin
Dolphins are mammals — they are warm-blooded, breathe air, give birth to live young, and feed them milk.
Question 3: What is the process by which living organisms break down food to release energy?
- Photosynthesis
- Respiration (Correct answer)
- Digestion
- Excretion
Correct answer: Respiration
Respiration is the process where cells break down glucose using oxygen to release energy, producing carbon dioxide and water.
Question 4: Which part of the human body is responsible for pumping blood?
- Brain
- Lungs
- Heart (Correct answer)
- Liver
Correct answer: Heart
The heart is a muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to cells.
Question 5: What are the basic units of life?
- Atoms
- Molecules
- Cells (Correct answer)
- Organs
Correct answer: Cells
Cells are the basic structural and functional units of all living organisms. All living things are made up of cells.
Question 6: Which of the following animals undergoes metamorphosis?
- Cat
- Chicken
- Butterfly (Correct answer)
- Dog
Correct answer: Butterfly
Butterflies undergo complete metamorphosis: egg → caterpillar (larva) → pupa (chrysalis) → adult butterfly.
PSLE Science Biology Topics 2
What type of reproduction involves only one parent?