BECE Integrated Science Questions, Solve All 10 Questions
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BECE INTEGRATED SCIENCE PART II QUESTIONS
1: a) Define the term “ecosystem.”
b) List three components of an ecosystem.
c) Explain the concept of energy flow within an ecosystem.
d) Give two examples of human activities that can disrupt an ecosystem.
2: a) Differentiate between a pure substance and a mixture.
b) State two characteristics of each type.
c) Give an example of a pure substance and explain why it is considered pure.
d) Identify two methods that can be used to separate a mixture and briefly describe how each method works.
3: a) Define the term “respiration.”
b) Name the two types of respiration that occur in living organisms.
c) Explain the process of aerobic respiration, including the reactants and products involved.
d) State two ways in which anaerobic respiration differs from aerobic respiration.
4: a) Define the term “electricity.”
b) Describe the difference between a conductor and an insulator.
c) Give three examples of conductors and three examples of insulators.
d) Explain how an electric circuit works, including the roles of the different components involved.
5: a) Define the term “force.”
b) State Newton’s first law of motion.
c) Give an example to illustrate Newton’s first law of motion.
d) Describe three factors that can affect the magnitude of the force exerted by an object.
NUMBER 6 TO 10 OF THE BECE QUESTIONS
6: a) Define the term “photosynthesis.”
b) List the two main raw materials needed for photosynthesis to occur.
c) Explain how light energy is converted into chemical energy during the process of photosynthesis.
d) Discuss the importance of photosynthesis in the ecosystem.
7: a) Define the term “density.”
b) Explain how density is calculated.
c) State the relationship between the density of a substance and its ability to float or sink in a fluid.
d) Provide an example of a substance that is less dense than water and explain why it floats.
8: a) Define the term “replication” in the context of DNA.
b) Describe the process of DNA replication, including the enzymes involved.
c) Explain why DNA replication is important for cell division and inheritance.
d) Discuss one factor that can cause errors or mutations during DNA replication.
9: a) Define the term “reflection” of light.
b) Describe the difference between regular and diffuse reflection.
c) State the laws of reflection and explain how they apply to the behavior of light rays.
d) Give two practical applications of reflection in everyday life.
10: a) Define the term “biodegradable.”
b) Give two examples of biodegradable materials and explain why they are considered biodegradable.
c) Discuss the environmental impact of using non-biodegradable materials.
d) State two ways in which individuals can contribute to reducing the use of non-biodegradable materials.
ANSWERS TO BECE QUESTIONS ABOVE
Below are all the answers to the questions above, compare your answers to our suggested answers.
1: a) Ecosystem is a biological community of interacting organisms and their physical environment.
b) The three components of an ecosystem are:
Biotic factors (living organisms)
Abiotic factors (non-living components)
Interactions between the biotic and abiotic factors
c) Energy flow within an ecosystem refers to the transfer of energy from one organism to another through food chains and food webs.
d) Examples of human activities that can disrupt an ecosystem include deforestation and pollution.
2: a) A pure substance consists of only one type of substance, while a mixture contains two or more different substances.
b) Characteristics of a pure substance:
It has a fixed melting and boiling point.
It cannot be separated into other substances by physical means.
Characteristics of a mixture:
It does not have a fixed melting and boiling point.
Its components can be separated by physical means.
c) An example of a pure substance is distilled water because it consists of only water molecules and does not contain any impurities.
d) Methods to separate a mixture:
Filtration: It separates solid particles from a liquid or gas by passing it through a filter.
Distillation: It separates a mixture based on differences in boiling points of the components.
3: a) Respiration is the process by which living organisms obtain energy from food and release waste products.
b) The two types of respiration are aerobic respiration and anaerobic respiration.
c) Aerobic respiration occurs in the presence of oxygen and involves the breakdown of glucose to produce carbon dioxide, water, and energy (in the form of ATP).
d) Anaerobic respiration occurs in the absence of oxygen and produces less energy compared to aerobic respiration. It can result in the production of lactic acid or ethanol as by-products.
4: a) Electricity is the flow of electric charge through a conductor.
b) A conductor is a material that allows the flow of electric charge, while an insulator is a material that restricts the flow of electric charge.
c) Examples of conductors: Copper, aluminum, silver
Examples of insulators: Rubber, plastic, glass
d) An electric circuit consists of a source of electrical energy (e.g., battery), conductors (wires) that connect the components, and devices (e.g., light bulb) that use the electrical energy. When the circuit is closed, the current flows from the source through the wires to power the devices.
5: a) Force is a push or pull on an object that can cause it to accelerate or change its state of motion.
b) Newton’s first law of motion (Law of Inertia) states that an object at rest will stay at rest, and an object in motion will stay in motion with a constant velocity unless acted upon by an external force.
c) Example: A book placed on a table will remain at rest until an external force (such as pushing or pulling) is applied to it.
d) Factors affecting the magnitude of force include the mass of the object, the acceleration of the object, and the angle or direction of the force applied.
ANSWERS FOR QUESTION 6 TO 10
6: a) Photosynthesis is the process by which green plants and some other organisms convert light energy into chemical energy to synthesize glucose and release oxygen as a by-product.
b) The two main raw materials needed for photosynthesis are carbon dioxide (CO2) and water (H2O).
c) During photosynthesis, light energy is absorbed by chlorophyll in the chloroplasts of plant cells. This energy is used to convert carbon dioxide and water into glucose (C6H12O6) and oxygen (O2).
d) Photosynthesis is important in the ecosystem as it is the primary source of energy for most living organisms and is responsible for oxygen production.
7: a) Density is the measure of how much mass is contained in a given volume of a substance.
b) Density is calculated by dividing the mass of an object by its volume: Density = Mass / Volume.
c) The relationship between the density of a substance and its ability to float or sink in a fluid is as follows:
If the density of an object is less than the density of the fluid, it will float.
If the density of an object is greater than the density of the fluid, it will sink.
d) An example of a substance less dense than water is wood. Wood floats because its density is lower than that of water.
8: a) Replication, in the context of DNA, refers to the process of making an identical copy of a DNA molecule.
b) DNA replication occurs in several steps and involves enzymes such as helicase, DNA polymerase, and ligase.
c) DNA replication is essential for cell division and inheritance because it ensures that each daughter cell receives an exact copy of the genetic information from the parent cell.
d) Errors or mutations during DNA replication can occur due to environmental factors, exposure to radiation, or mistakes made by the enzymes involved. These mutations can lead to genetic variations and sometimes result in genetic disorders or diseases.
9: a) Reflection of light is the bouncing back of light rays when they encounter a surface.
b) Regular reflection occurs when parallel light rays hit a smooth and polished surface, reflecting in a regular and orderly manner. Diffuse reflection occurs when light rays hit a rough or irregular surface, causing the reflection to scatter in different directions.
c) The laws of reflection state that:
The angle of incidence is equal to the angle of reflection.
The incident ray, reflected ray, and normal (a perpendicular line to the surface) all lie on the same plane.
d) Examples of practical applications of reflection include mirrors, shiny surfaces, and optical devices like telescopes and periscopes.
10: a) Biodegradable refers to materials that can be broken down or decomposed by natural processes, such as the action of microorganisms.
b) Examples of biodegradable materials: Food waste, paper, and plant-based products (e.g., cotton).
They are considered biodegradable because microorganisms can break them down into simpler substances.
c) Using non-biodegradable materials can have environmental impacts such as pollution, littering, and long-term accumulation in ecosystems.
d) Individuals can contribute to reducing the use of non-biodegradable materials by practicing recycling, using reusable products, and supporting initiatives for eco-friendly alternatives.
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