Before you go to bed, take a look at the following: 2025 BECE Science Section B Revision Questions and Answers. Do not skip any of the following questions. At the end of each question, the answers have been provided to aid your effective learning. Go through all of them as part of your revision.

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2025 BECE Science Section B Q & A for evening revision

SECTION B
[60 marks]
Answer three questions only from this section.

Question 2 { 2025 BECE Science Section B Q & A for evening revision
(a) i. While preparing for a health quiz competition, Efua was asked to explain the value of certain nutrients in the human body. Can you help her by stating one importance each of the following nutrients?
Vitamins
Minerals
Fibre [3 marks]

ii. During a biology class experiment, Kweku observed the action of bile in fat digestion. Can you mention two roles bile plays in the digestive system? [2 marks]

(b) i. Bernice was drenched on her way from school. At home, her mother asked her to change clothes and sit by the fireside to warm up.
What form of heat transfer is helping Bernice to get warm? [1 mark]
Describe how this heat transfer works to keep her warm. [2 marks]

ii. A science club wanted to calculate energy in raised objects. They lifted an object with a mass of 1,500 g to a height of 16 m above the ground. Using g = 10 m/s², calculate the potential energy of the object.
[2 marks]

(c) i. Ama accidentally mixed some sand with sugar in the kitchen. Her little brother suggested they try to separate the mixture. How would you go about separating the sand from the sugar? [3 marks]

ii. In a school laboratory, students used a method to separate colored dyes in ink. Their teacher called it chromatography. Explain what chromatography means. [2 marks]

(d) i. On a visit to a local farm, students were asked to mention some feeds given to animals. List two types of feed that farm animals are given. [2 marks]

ii. During the same farm visit, the farmer explained why animals must have enough water. State three things that could happen to farm animals if they are not given adequate water. [3 marks]

READ: 2025 BECE Science (Practical) Revision Q & A Before Bed Time

Question 3
(a) i. Mr Adai frequently uses NPK 15:15:15 and NPK 17:17:17 on his farm. State two challenges Mr Adai is likely to face. (2 marks)
ii. State three challenges associated with wind energy. (3 marks)

(b) i. Kofi applied a greater amount of force to a catapult in order to hit a bird flying farther away. State three factors Kofi considered before his action. (3 marks)
ii. Differentiate between waste assembling and waste collection. (3 marks)

(c) i. State two ways to reduce the risk of cancer. (2 marks)
ii. It is concluded that the diagram below shows the formation of hydrogen chloride. Explain the illustration. (4 marks)

(d) John says that biodegradable wastes are larger pollutants than non-biodegradable wastes. Explain why you agree or disagree with John. (3 marks)

Question 4
(a) JHS students in Mankessim want to make a local soap in the laboratory but the steps involved in indigenous(local) soap making are mixed up. Guide the students to rearrange the steps in the correct order.
I – Press the solid in a filter paper and allow it to dry
II – Add Brine to the mixture to precipitate the crude soap (crust)
III – Remove the crust at the top of the liquid and wash with water to remove excess glycerol
IV – Boil and stir for some time and allow to cool down’
V – The end product is the soap
VI – Take adequate palm oil and heat in a container’
VII – Gather dry cocoa pods or plantain peels and burn to ashes
VIII – Addwatertothe ashes, stir and filter to obtain a solution
IX – Pour the solution into the heated oil. [9 marks]

(b) i. State two differences between asteroids and meteoroids. [2 marks]
ii. What are specialized cells? [2 marks]

(c) i. Across the globe, fuel tanks are commonly painted white or silver. Using your understanding of energy and forces, explain the scientific reason behind this practice. [3 marks]
ii. List two differences between mass and weight. [2 marks]

(d) While playing football, Kwame noticed that each time he kicked the ball, his leg moved slightly backward. Later, during a science lesson, his teacher explained that this was an example of a physical law that governs action and reaction forces. Based on this explanation, give two applications of Newton’s Third Law of Motion in everyday life. [2 marks]

READ: January 2025 BECE Integrated Science Mock Questions

Question 5
(a) Kwame is helping his uncle on their vegetable farm. One afternoon, his uncle tells him they need to move the young tomato plants from the nursery to the main field.
i. Based on the farming activity Kwame is involved in, explain what he is about to do. [2 marks]
ii. Later, Kwame asks his uncle why they usually carry out this activity in the evening rather than during the day. What reason do you think the uncle would give him? [4 marks]

(b) Ama is reading a science book about the solar system and gets curious about the planets that are farthest from the sun.
i. She lists some names and asks her science teacher to confirm if they are outer planets. Mention three planets Ama might have written that are considered outer planets. [3 marks]
ii. Her teacher goes further to describe some features these planets share. State three general characteristics that Ama learns about these outer planets. [3 marks]

(c) Yaw is organizing his notes for a science quiz. He comes across a section titled “Chemical Symbols” and wonders what it means.
i. What explanation would help Yaw understand the term “chemical symbol”? [2 marks]
ii. He tries to match the names of some elements to their correct symbols. Help him by writing the correct chemical symbols for:
Silver
Lead
Gold [3 marks]

SUGGESTED SOLUTIONS TO ALL THE QUESTIONS

Question 2
(a)i. Importance of nutrients:
Vitamins:
• Help in boosting the immune system.
• Aid in proper growth and development.
• Help in the repair of body tissues.

Minerals:
• Build strong bones and teeth.
• Help in blood formation and circulation.
• Support muscle and nerve function.

Fibre:
• Helps in proper digestion.
• Prevents constipation.
• Promotes bowel movement. 3 marks @ 1 mark each

ii. Roles of bile in the digestive system:
• Bile breaks down fats into smaller droplets.
• Bile neutralizes acidic food from the stomach.
• Bile provides an alkaline medium for enzyme action.
• Bile helps in the absorption of fat-soluble vitamins. 2 marks @ 1 mark each for any 2

(b) i. Form of heat transfer:
• Radiation 1 mark

How it works:
Heat energy from the fire travels in waves through the air. The waves are absorbed by Bernice’s body, making her feel warm. 2 marks

ii. Potential energy calculation:
Mass = 1,500 g = 1.5 kg
Height = 16 m
g = 10 m/s²
Potential Energy (PE) = m × g × h
= 1.5 × 10 × 16
= 240 joules 2 marks

(c) i. To separate the sand from the sugar:
• Add water to dissolve the sugar.
• Filter the mixture using filter paper.
• Evaporate the filtrate to get the sugar back. 3 marks

ii. What chromatography means:
Chromatography is a method used for separating coloured substances into individual pigments. The components of the mixture are separated by their relative attraction for a stationary phase as a mobile phase passes over the stationary phase 2 marks

(d) i. Types of animal feed:
• Roughages
• Concentrates
• Basal
• Supplementary 2 marks @ 1 mark each for any 2

ii. Effects of lack of water on animals:
• The animals may become weak.
• They may eat less food.
• Their milk production may reduce.
• They may not grow properly.
• They may die eventually. 3 marks @ 1 mark each for any 3

Question 3: 2025 BECE Science Section B Q & A for evening revision
(a) i. Mr Adai frequently uses NPK 15:15:15 and NPK 17:17:17 on his farm. State two challenges Mr Adai is likely to face.
• Nutrient imbalance in the soil may occur due to the fixed ratios of nitrogen, phosphorus, and potassium in the NPK fertilizers.
• Overuse of synthetic fertilizers like NPK may lead to soil degradation and loss of soil fertility over time.
• Continuous reliance on commercial NPK fertilizers can be costly and may strain Mr. Adai’s financial resources.
• Excessive application of NPK fertilizers may contribute to environmental pollution through nutrient runoff and leaching.
1 mark each × any 2 = 2 marks

ii. State two challenges associated with wind energy.
• Wind energy generation is intermittent, depending on wind availability.
• High initial capital costs for installing wind turbines and infrastructure.
• Concerns about visual impact and noise pollution in areas with wind farms.
• Challenges in grid integration and transmission due to variable output from wind turbines.
1 mark each × any 3 = 3 marks

b. i. Factors Kofi considered before applying a greater amount of force to a catapult.
• Distance to the target
• Wind speed and direction
• Projectile weight and shape
• Accuracy and precision 1 mark each × any 3 = 3 marks

ii. Difference between waste assembling and waste collection.
Waste assembling refers to the gathering of waste materials at their point of generation, whilst waste collection is transporting assembled waste materials to a designated disposal site or facility.
3 marks

c. i. Two ways to reduce the risk of cancer.
• Avoid smoking
• Eat a healthy
• Exercise regularly
• Maintain healthy weight 1 mark each × any 2 = 2 marks

ii. Explanation of how hydrogen chloride is formed.
Hydrogen chloride is formed through a chemical reaction between hydrogen gas and chlorine gas. One molecule of hydrogen gas reacts with one molecule of chlorine gas to produce two molecules of hydrogen chloride gas.
The reaction between hydrogen and chlorine is releases a significant amount of heat energy. It is usually initiated by providing an initial energy input, such as heat to break the strong bonds between the hydrogen and chlorine atoms. Once the reaction begins, it proceeds rapidly to form hydrogen chloride gas.
4 marks

d. John says that biodegradable wastes are larger pollutants than non-biodegradable wastes. Explain why you agree or disagree with John.
I disagree with John’s statement. Non-biodegradable wastes are rather considered a larger pollutant than biodegradable wastes because of their persistence, accumulation, toxicity, environmental damage, and disposal challenges
3 marks

Question 4: 2025 BECE Science Section B Q & A for evening revision
(a) Steps involved in making indigenous soap
VII – Gather dry cocoa pods or plantain peels and burn them to ashes
VIII – Add water to the ashes, stir and filter to obtain a solution.
VI – Take adequate palm oil and heat in a container.
IX – Pour the solution into the heated oil.
IV – Boil and stir for some time und allow to cool down.
II – Add Brine to the mixture to precipitate the crude soap (crust).
III – Remove the crust at the top of the liquid and wash with water to remove excess glycerol.
I – Press the solid in a filter paper and allow it to dry.
V – The end product is the soap. [1 mark each x 9 = 9 marks]

(b) i. Differences between Asteroids and Meteoroids;
• Asteroids-are generally larger than meteoroids, ranging from a few meters to hundreds or kilometers in diameter.
• Most asteroids are found in the asteroid belt between Mars and Jupiter whereas meteoroids can be found throughout the solar system and are often fragments or asteroids or comets.
• Asteroids arc remnants from the solar system that never coalesced into planets while meteoroids originate from asteroids, comets, or other celestial bodies that have broken apart due to collisions.
Any 2 × 1 mark each = 2 marks

ii. Specialized cells are cells that have developed specific structures and functions to perform particular tasks within an organism. 2 marks

(c) i. White and silver surfaces are excellent reflectors of sunlight, including infrared radiation. This reduces the amount of solar energy absorbed by the tank, keeping its interior cooler. Hence preventing the combustion of fuel within the tank which would lead to explosion. 3 marks

ii. Difference between Mass and Weight
Mass Weight
It is a scalar quantity It is a vector quantity
It is the quantity of matter in an object It is the force of gravity on a body
It has a unit kilogram It has the unit Newton
It constant everywhere

Beam balance is used to measure It varies from place to place

Spring balance is used to measure

0.5 mark each x 2 = 2 marks

(d) Application of newton’s third law of motion in everyday Iife;
• The forward movement of the boat is as a result of the exerted reaction of water when paddled backwards.
• When a person sits on the chair, the chair exerts a force which is equal and opposite to the person’s weight.
• The operation of airplane works on the principle of Newton’s Third Law of Motion etc.
Any 2 x 1 mark each = 2 marks

Question 5: 2025 BECE Science Section B Q & A for evening revision
(a) Kwame is helping his uncle on their vegetable farm. One afternoon, his uncle tells him they need to move the young tomato plants from the nursery to the main field.
i. Kwame is about to carry out transplanting, which is the process of removing young plants from a nursery bed and replanting them in a permanent location where they can grow to maturity. 2 marks

ii. Transplanting is best done in the evening because the temperature is cooler and there is less sunlight, which reduces water loss through evaporation and transpiration. This helps the young plants to recover from transplanting shock and reduces the chances of wilting. 4 marks

(b) Ama is reading a science book about the solar system and gets curious about the planets that are farthest from the sun.

i. Outer planets Ama might have listed are:
• Jupiter
• Saturn
• Uranus
• Neptune Any 3 x 1 mark each = 3 marks

ii. General characteristics of the outer planets are:
• They are much larger than the inner planets.
• They are composed mainly of gases and are often called gas giants.
• They have many moons.
• They possess ring systems.
• They are located far from the sun and have longer orbital periods.
Any 3 x 1 mark each = 3 marks

(c) Yaw is organizing his notes for a science quiz. He comes across a section titled “Chemical Symbols” and wonders what it means.

i. A chemical symbol is a one- or two-letter abbreviation used to represent an element. It is usually derived from the element’s English or Latin name. 2 marks

ii. The correct chemical symbols are:
Silver – Ag
Lead – Pb
Gold – Au 1 mark each = 3 marks

(d) During a class discussion, the teacher asks the students to think about where all energy in food chains and ecosystems comes from. Afia confidently says it all begins with the sun.
Afia is right because the sun provides the energy needed by plants (producers) to make food through photosynthesis. These plants are eaten by herbivores, which are then eaten by carnivores. Without the sun, plants cannot produce food, and the entire food chain would collapse. Thus, the sun is the ultimate source of energy in all ecosystems. 3 marks

Tags: 2025 BECE Science