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COMBINED SCIENCE 5129/12 JUN 2025

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COMBINED SCIENCE 5129/12 JUN 2025

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Combined Science GCE O level

Created by

MyAr D
MyAr D
Brunei Darussalam

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COMBINED SCIENCE 5129/12 JUN 2025
 

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COMBINED SCIENCE 5129/12 JUN 2025Online version

Combined Science GCE O level

by MyAr D
1

Unlike root hair cells , palisade mesophyll cells contain , which allow them to perform photosynthesis .

2

When a plant cell is placed in a concentrated salt solution , water moves out of the cell from a high water potential to a low water potential , causing the cell to become .

3

During the night , plants take in and release carbon dioxide through their stomata .

4

Water required for photosynthesis is supplied to the mesophyll cells by the tissue .

5

In the human mouth , starch undergoes chemical digestion by the enzyme .

6

In the liver , excess acids are broken down to produce urea .

7

Expired air contains a concentration of oxygen compared to inspired air .

8

During exercise , anaerobic respiration in human muscle cells produces acid only .

9

Increasing the amount of in the diet increases the risk of developing coronary heart disease .

10

A simple reflex arc consists of a sensory neuron , a relay neuron , and a neuron .

11

Human female gametes ( egg cells ) are much in size than male gametes ( sperm ) .

12

The process of reduces the chromosome number in a cell by half .

13

Deforestation in a rainforest leads to an increase in loss .

14

Particles in a gas have weak forces of attraction between them and are spaced apart .

15

A has a relative mass of 1 and a relative charge of + 1 .

16

Ionic compounds like sodium chloride have a high melting point and conduct electricity when or dissolved in water .

17

Methanol contains single covalent bonds formed by shared pairs of between atoms .

18

In chromium oxide { Cr } _2 { 0 } _3 , each chromium ion carries a charge of + .

19

Reacting 0 . 166 g of potassium iodide with chlorine gas produces . g of iodine .

20

A catalyst speeds up a chemical reaction without being up in the process .

21

In the reaction CuO + { H } _2 to { Cu } + { H } _2 { O } , copper is reduced and hydrogen is .

22

An alkaline solution like aqueous sodium ethanoate turns Universal Indicator .

23

Elements in the Periodic Table are arranged in order of increasing number .

24

Aluminum is suitable for food containers because it resists .

25

Copper does not react with dilute hydrochloric acid because it is less reactive than .

26

The main constituent of natural gas is { CH } _4 .

27

The heavy petroleum fraction fuel oil / heavy gas oil ( Fraction X ) is used as fuel for

28

The SI unit for acceleration is { / } .

29

An astronaut who weighs 900 N on Earth ( where g = 10 N / kg has a mass of kg on the Moon .

30

Pulling two stacked 2 . 0 kg blocks with a force of 10 N produces an acceleration of . { m / s } ^2 .

31

When a beam is balanced horizontally with a pivot at its center , the objects at each end must have the same mass and the same .

32

Energy from the Sun is released by the process of nuclear in its core .

33

Waves transfer from one place to another without transferring matter .

34

A ray of light passing from air into glass bends toward the normal line , making the angle of refraction than the angle of incidence .

35

When light reflects off a flat mirror , the angle of reflection is always equal to the angle of .

36

Four 1 . 2 V cells connected in series provide a total combined voltage of . V .

 
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