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QCS 502 - TEST CONSTRUCTION ASSIGNMENT TABLE OF SPECIFICATIONS Test Format: Pupils will sit for a written paper which is 1 hour in duraton. The paper consists of two parts: Section A – 6 MCQs, and Section B – 2 Open-ended items. Level

Topics

No. of questions MCQ

Lower Block Theme: System

Lower Block Theme: System

Lower Block

KWU

AOK/PS

1

1

(Q2)

(Q1)

0

Number of questions

Total No. of Marks for topic

Chapter 3: The Digestive System Describe the functions of the human digestive system  Recognize that not all organs in the digestive system is involved in digestion of food.  Recognize that the digestive system is involved in breaking down food and absorbing food Chapters 4: Plants and their Parts

0

0

2

4 marks

2

1

0

3

8 marks

(Q3, Q4)

(Q7) (1 x 4m)

0

0

1

3

8 marks

Identify various plant parts like stems and leaves  Describe the functions of roots  List functions of stems and leaves  Relate functions of roots of plants grown in soil to the functions of roots of plants partially-submerged in water Chapter 1: Magnets and their characteristics 

2 Theme: Interactions

Open-ended KWU AOK/PS

Show understanding that like poles attract and unlike poles repel  Describe the characteristics of magnets  Describe that the strength of attraction is strongest at the poles  Describe properties of magnetic and nonmagnetic materials  List examples of magnetic and non-magnetic material Total number of questions Total number of marks 

(Q5, Q6)

3 6

(Q8) (1 x 4m)

3 6

1 4

1 4

8 20


QCS 502 Test Construction Assignment TABLE OF SPECIFICATIONS (TOS) PRIMARY FOUR SCIENCE MARK SCHEME

Section A 1. 2. 3.

(4) (4) (1)

4. 5. 6.

(2) (1) (2)

Section B Accepted Answers

1a.

Marks

Non-accepted / Partial Answers / Remarks

i) Leaf / Leaves

1m

-

ii) They help the plant to make food.

1m

Leaves help a plant to grow well. – 0 mark Leaves contain chlorophyll – ½ m

1b.

i) Stem

1m

Trunk – 0 mark

ii) It supports the plant / stores food / carries food, water and mineral salts to all parts of the plant.

1m

It forms the link between the leaves and the roots. –½m


2a.

2b.

Magnets

Magnetic Materials

Non-magnetic Materials

B

D

A, C

½ mark each

-

A: Wood / Glass / Paper / Clay

A: Accept any non-metals.

B: Magnet

B: -

C: Gold / Silver / Copper / Aluminum D: Iron / Steel

½ mark each

C: Accept any metallic, non-magnetic materials D: Accept any magnetic materials. If pupils list objects without materials – 0 mark


JUSTIFICATION OF DISTRACTORS QUESTION 3 Option 1

Justification Correct answer. Pupils may select this option as both the absorption of water and minerals and the holding and supporting of the plant are functions of roots of plants that are planted in soil.

2

However, the plant in this question is water hyacinth, which do not grow in soil but floats on water. Hence, its roots do not help to hold and support the plant firmly. Pupils who select this option shows that they have the knowledge and understanding of the functions of roots of plants grown in soil, but they are not able to apply the concept these understanding to a new situation.

3

Pupils may select this option as they think that water hyacinth, being partially submerged in water, grows/lives in the same manner as fishes. Hence, they may decide that, like fishes, plants that floats on water also absorbs the dissolved oxygen present in the water. Pupils may arrive at this option by elimination method.

4

Firstly, pupils may think that since water hyacinth is already partially submerged in water, it does not need to take in any more water from its roots. Hence, statement A would be eliminated, and they would then arrive at Option 4.


QUESTION 5 Option

Justification

1

Correct answer.

2

Pupils may select this option if they are unaware that there is a difference in strength of attraction at different points of a magnet. Hence, they may think that the number of paper clips attracted will be random and not follow any particular pattern. Only this option provides a random number of paper clips attracted at the 4 points.

3

Pupils may select this option as they think that the strength of attraction of a bar magnet is the same at any point of the magnet. They may think that since the bar magnet was lowered horizontally onto the pile of metal paper clips, the number of paper clips should be the same at every point. These pupils have not shown understanding that the two poles of a magnet display the strongest force of attraction.

4

Pupils may select this option if their knowledge of this concept is unclear.They most likely have knowledge that the strength of attraction is strongest at certain points of the magnet, but are unable to identify that it is the 2 poles. Also, pupils may select this option if they do not have knowledge of where the poles of the bar magnet is at, and hence are unable to select the right option.


Test Construction_MarkScheme