Primary 3 Science · Answers and explanations

Classification of Living Things: Investigation

Use this page to check the worksheet together. Talk about why each answer is right. Total: 20 marks.

Section A · Multiple choice 8 marks

1. Use Table 1 for Questions 1 to 3. Which animal is a fish?1 mark

Table 1: Notes made by a pupil on six animals
Animal	Outer covering	Lays eggs?	Breathes with	Other clue
P	feathers	Yes	lungs	has a beak and two wings
Q	scales	Yes	gills	has fins; lives in water
R	fur	No	lungs	feeds its young with milk
S	moist skin	Yes	lungs and skin (adult)	lays eggs in water
T	dry scales	Yes	lungs	lays eggs on land
U	hard outer covering	Yes	air tubes	6 legs, 3 body parts

(A) Animal P(B) Animal Q(C) Animal R(D) Animal T

Answer: (B) Animal QQ has scales and breathes with gills, which are fish features.

2. Which animal in Table 1 is an amphibian?1 mark

(A) Animal S(B) Animal Q(C) Animal T(D) Animal U

Answer: (A) Animal SS has moist skin and lays its eggs in water. T has dry scales, so it is a reptile.

3. How many of the six animals in Table 1 lay eggs?1 mark

(A) 3(B) 4(C) 6(D) 5

Answer: (D) 5Only R (the mammal) does not lay eggs. 6 animals take away 1 is 5.

4. Use Table 2. Which plants are non-flowering plants?1 mark

Table 2: Four plants in the school garden
Plant	Has flowers?	Has spore bags or capsules?	Other clue
W	Yes	No	has flowers; makes seeds
X	No	Yes	spore bags under its leaves
Y	Yes	No	has flowers; makes fruits with seeds
Z	No	Yes	spore capsules; no flowers

(A) W and Y(B) W and X(C) X and Z(D) Y and Z

Answer: (C) X and ZX and Z have no flowers and make spores. W and Y have flowers.

5. How does plant X make new plants?1 mark

(A) By seeds in a fruit(B) By spores(C) By flowers only(D) By eating other living things

Answer: (B) By sporesA plant with spore bags and no flowers (such as a fern) reproduces by spores.

6. Animal Y has four legs and dry scales. It has no feathers, no fur and no gills. Use the key. Which group does Y belong to?1 mark

(A) Reptile(B) Fish(C) Amphibian(D) Mammal

Answer: (A) ReptileNot 6 legs, no feathers, no fur, has scales, no gills: reptile.

7. Use Table 3. The pupil wants to find out if water affects mould growth. Which two slices should be compared?1 mark

Table 3: A pupil kept three slices of bread in sealed bags (same bread, same size)
Slice	Where it was kept	Mould after 5 days (squares covered)
A	warm and moist place	9
B	warm and dry place	1
C	cold and moist place	2

(A) A and C(B) B and C(C) A, B and C(D) A and B

Answer: (D) A and BA and B are both warm. Only the moisture is different, so it is a fair test for water.

8. What does Table 3 show about mould?1 mark

(A) It grows more in cold places(B) It grows only on dry bread(C) It grows more in warm, moist places(D) It makes its own food from light

Answer: (C) It grows more in warm, moist placesSlice A (warm and moist) had the most mould: 9 squares.

Section B · Show what you know 12 marks

9. Look at animals P and T in the table. Both lay eggs. Name the animal group of P and the animal group of T.2 marks

Notes on two animals from Table 1
Animal	Outer covering	Lays eggs?	Breathes with	Other clue
P	feathers	Yes	lungs	has a beak and two wings
T	dry scales	Yes	lungs	lays eggs on land

Answer: P is a bird. T is a reptile.P has feathers, a beak and wings (bird). T has dry scaly skin and breathes with lungs (reptile). 1 mark each.

10. Animal S and animal T both have four legs. Name the group of S and state one way the skin of S is different from the skin of T.2 marks

Notes on two animals from Table 1
Animal	Outer covering	Lays eggs?	Breathes with	Other clue
S	moist skin	Yes	lungs and skin (adult)	lays eggs in water
T	dry scales	Yes	lungs	lays eggs on land

Answer: S is an amphibian. Its skin is moist, but T has dry, scaly skin.1 mark for amphibian. 1 mark for moist skin compared with dry scaly skin.

11. Look at plants W and X in Table 2. How does each plant make new plants?2 marks

Table 2: Four plants in the school garden
Plant	Has flowers?	Has spore bags or capsules?	Other clue
W	Yes	No	has flowers; makes seeds
X	No	Yes	spore bags under its leaves
Y	Yes	No	has flowers; makes fruits with seeds
Z	No	Yes	spore capsules; no flowers

Answer: W makes new plants by seeds. X makes new plants by spores.Flowering plants reproduce by seeds. Ferns and other non-flowering plants with spore bags reproduce by spores. 1 mark each.

12. The pupil puts slice E in a warm, moist place for 5 days. Slice E is the same bread as the others. Predict whether E will have more or less mould than slice C. Give a reason.2 marks

Table 3: A pupil kept three slices of bread in sealed bags (same bread, same size)
Slice	Where it was kept	Mould after 5 days (squares covered)
A	warm and moist place	9
B	warm and dry place	1
C	cold and moist place	2

Answer: More mould than C. E is warm and moist like A, which had a lot of mould, but C was cold.1 mark for more mould. 1 mark for using the data: warm and moist like slice A, whereas C was cold.

13. Mould is a fungus that grows on bread. Why must mould grow on food such as bread?2 marks

Answer: It cannot make its own food. It takes food from the bread.Fungi cannot make their own food, so they take nutrients from other things. 1 mark each part.

14. Animal M looks like a fish. Which group does it belong to? Give one reason from the notes.2 marks

Notes on animal M
Lives in the sea and has a smooth body shaped like a fish
Swims using flippers and a tail
Comes up to the surface to breathe air with lungs
Gives birth to a baby and feeds it milk

Answer: Mammal. It gives birth and feeds its baby with milk (or breathes with lungs).Fish breathe with gills and have scales; M has lungs and feeds milk. 1 mark for mammal, 1 mark for a correct reason.

Shukr Learns · free practice for parents and children · original questions, not affiliated with any school or agency