Primary 3 Science · Answers and explanations
Classification of Living Things
Use this page to check the worksheet together. Talk about why each answer is right. Total: 16 marks.
Section A · Multiple choice 5 marks
1. Which group of animals has feathers, a beak and wings, and lays eggs?
(A) Mammals(B) Birds(C) Reptiles(D) Fish
Answer: (B) BirdsBirds have feathers, a beak and wings, and they lay eggs. A chicken is a bird.
2. Which of these is a fungus?
(A) A mushroom(B) A fern(C) A hibiscus(D) An ant
Answer: (A) A mushroomFungi cannot make their own food. Mushrooms, mould and yeast are fungi. A fern and a hibiscus are plants, and an ant is an animal.
3. How many legs and body parts does an insect have?
(A) 4 legs and 2 body parts(B) 6 legs and 2 body parts(C) 8 legs and 3 body parts(D) 6 legs and 3 body parts
Answer: (D) 6 legs and 3 body partsAn insect has 6 legs and 3 body parts: the head, thorax and abdomen.
4. How do ferns reproduce?
(A) By flowers and seeds(B) By laying eggs(C) By spores(D) By giving birth
Answer: (C) By sporesFerns are non-flowering plants. They do not have flowers or seeds, so they reproduce by spores.
5. Which animal group has dry, scaly skin and breathes with lungs?
(A) Amphibians(B) Reptiles(C) Fish(D) Mammals
Answer: (B) ReptilesReptiles such as lizards have dry, scaly skin and breathe with lungs. Amphibians have moist skin.
Section B · Fill in the blanks 5 marks
6. Animals, plants, fungi and are the four groups of living things.
Answer: bacteriaBacteria are tiny living things that can only be seen with a microscope.
7. A cat has fur and its mother feeds her young with milk. A cat is a .
Answer: mammalMammals have hair or fur, and mothers feed their young with milk.
8. A fish has fins and scales, and breathes with .
Answer: gillsFish take in air from the water using their gills.
9. A frog has moist skin and lays its eggs in water. A frog is an .
Answer: amphibianAmphibians have moist skin, and their eggs are laid in water.
10. Plants can make their own food using .
Answer: lightPlants make their own food using light. Fungi and animals cannot make their own food.
Section C · Short answers 6 marks (2 each)
11. Name one way a flowering plant is different from a fern.
Answer: A flowering plant has flowers and seeds, but a fern does not (it reproduces by spores). (2 marks: accept any correct difference with a reason.)Flowering plants such as hibiscus make seeds in their fruits. Ferns have no flowers and reproduce by spores.
12. Sam says, "A mushroom is a plant because it grows from the ground." Is Sam correct? Give a reason.
Answer: No (1 mark). A mushroom is a fungus. It cannot make its own food, but plants can (1 mark).Plants make food using light. Fungi do not.
13. Give one way fungi can be useful and one way they can be harmful.
Answer: Useful: yeast is used to make bread, or some mushrooms are food (1 mark). Harmful: mould makes food go bad (1 mark).Fungi and bacteria can be useful or harmful.
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