i) Respiration is the biochemical process by which living organisms break down organic substances, like glucose, to release energy for metabolic activities.

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Asked on May 24, 2026Computer Science

This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.

Accepted Answer · 2026-05-24T21:23:49.293Z

2(a) i) Respiration is the biochemical process by which living organisms break down organic substances, like glucose, to release energy for metabolic activities. ii) • Aerobic respiration requires oxygen and produces a large amount of ATP (energy), while anaerobic respiration does not require oxygen and produces a smaller amount of ATP. • Aerobic respiration produces carbon dioxide and water as byproducts, while anaerobic respiration produces byproducts like lactic acid (in animals) or ethanol and carbon dioxide (in plants/yeast). 2(b) i) • Potential energy is the energy an object possesses due to its position or state (e.g., gravitational potential energy, elastic potential energy). It is stored energy. • Kinetic energy is the energy an object possesses due to its motion. It is the energy of movement. ii) Step 1: Identify the given values. Mass (m) = 100 kg Velocity (v) = 8 m/s Step 2: Use the formula for kinetic energy. KE = (1)/(2)mv^2 Step 3: Substitute the values and calculate. KE = (1)/(2) × 100 kg × (8 m/s)^2 KE = (1)/(2) × 100 kg × 64 m^2/s^2 KE = 50 kg × 64 m^2/s^2 KE = 3200 J The kinetic energy is 3200 J. 2(c) i) Electronic configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. It describes how electrons are arranged around the nucleus. ii) • Protons are positively charged particles found in the nucleus of an atom, while electrons are negatively charged particles that orbit the nucleus. • Protons have a significantly larger mass compared to electrons (approximately 1836 times heavier). 2(d) Four importance of soil water: • It is essential for plant growth as it dissolves nutrients for absorption. • It helps in regulating soil temperature. • It facilitates the decomposition of organic matter by microorganisms. • It is a component of the soil solution, which transports nutrients. 3. a (i) α) Ecosystem: An ecosystem is a community of living organisms (biotic components) interacting with each other and with their non-living environment (abiotic components) in a particular area. β) Adaptation: Adaptation is a heritable trait that helps an organism survive and reproduce in its specific environment. It can be structural, physiological, or behavioral. μ) Habitat: A habitat is the natural environment or home where a particular organism lives. It provides the necessary resources for survival, such as food, water, and shelter. 3. a (ii) Three adaptations of a fish in its habitat: • Streamlined body shape: Reduces drag and allows for efficient movement through water. • Gills: Specialized organs for extracting oxygen from water. • Fins: Used for propulsion, steering, and maintaining balance in water. 3. b. Four uses of the periscope: • Used in submarines to see above the water surface. • Used in tanks to observe the surroundings from inside. • Used in trenches during warfare to observe enemy positions without exposing oneself. • Used by spectators in crowded events to see over obstacles. 3. c (i) • Hard water contains a high concentration of dissolved mineral ions, primarily calcium (Ca^2+) and magnesium (Mg^2+) ions. • Soft water contains a low concentration of these mineral ions. 3. c (ii) Two advantages of hard water over soft water: • It provides essential minerals like calcium and magnesium, which are beneficial for human health (e.g., bone development). • It has a better taste for drinking due to the dissolved minerals. 3. d (i) Fertilizer application is the process of adding nutrients to the soil or directly to plants to enhance plant growth and crop yield. 3. d (ii) Four methods of fertilizer application: • Broadcasting: Spreading fertilizer uniformly over the entire field. • Placement: Applying fertilizer in concentrated bands near the seeds or plants. • Foliar application: Spraying liquid fertilizer directly onto the leaves of plants. • Fertigation: Applying fertilizer dissolved in irrigation water. 4. a. Four importance of the carbon cycle: • It regulates the Earth's climate by controlling the concentration of carbon dioxide in the atmosphere. • It is essential for photosynthesis, providing carbon dioxide for plants to produce organic matter. • It facilitates the transfer of energy through ecosystems as carbon compounds move through food chains. • It is crucial for the formation of fossil fuels (coal, oil, natural gas) over geological time. 4. b. i) Soil structure: Refers to the arrangement of soil particles (sand, silt, clay) into aggregates or peds. It influences water infiltration, aeration, and root penetration. ii) Soil texture: Describes the relative proportions of different-sized mineral particles (sand, silt, and clay) in a soil. It determines how water and nutrients are held. iii) Soil porosity: The volume of pore spaces (empty spaces) within the soil, which can be filled with air or water. It affects aeration and water retention. iv) Soil capillarity: The ability of soil to draw water upwards against the force of gravity through its pore spaces, due to adhesive and cohesive forces. 4. c. (i) A compound is a substance formed when two or more different chemical elements are chemically bonded together in a fixed ratio. 4. c. (ii) Three differences between a compound and a mixture: • In a compound, elements are chemically bonded, forming new substances with different properties, while in a mixture, substances are physically combined and retain their original properties. • A compound has a fixed composition by mass, whereas a mixture has a variable composition. • The components of a compound can only be separated by chemical means, while the components of a mixture can be separated by physical means. 4. d. (i) Frictional force is a force that opposes motion or attempted motion between two surfaces in contact. 4. d. (ii) Three applications of friction: • Walking: Friction between shoes and the ground allows us to walk without slipping. • Braking: Friction in brakes helps to slow down or stop vehicles. • Writing: Friction between a pen/pencil and paper allows ink/graphite to be deposited. 5. a. (i) • Transpiration is the process by which plants release water vapor into the atmosphere, primarily through stomata on their leaves. It is mainly a physical process driven by water potential gradients. • Photosynthesis is the process by which green plants and some other organisms convert light energy into chemical energy, synthesizing sugars from carbon dioxide and water. It is a biochemical process. What's next?

Accepted Answer · 2026-05-24T21:23:49.293Z

2(a) i) Respiration is the biochemical process by which living organisms break down organic substances, like glucose, to release energy for metabolic activities. ii) • Aerobic respiration requires oxygen and produces a large amount of ATP (energy), while anaerobic respiration does not require oxygen and produces a smaller amount of ATP. • Aerobic respiration produces carbon dioxide and water as byproducts, while anaerobic respiration produces byproducts like lactic acid (in animals) or ethanol and carbon dioxide (in plants/yeast). 2(b) i) • Potential energy is the energy an object possesses due to its position or state (e.g., gravitational potential energy, elastic potential energy). It is stored energy. • Kinetic energy is the energy an object possesses due to its motion. It is the energy of movement. ii) Step 1: Identify the given values. Mass (m) = 100 kg Velocity (v) = 8 m/s Step 2: Use the formula for kinetic energy. KE = (1)/(2)mv^2 Step 3: Substitute the values and calculate. KE = (1)/(2) × 100 kg × (8 m/s)^2 KE = (1)/(2) × 100 kg × 64 m^2/s^2 KE = 50 kg × 64 m^2/s^2 KE = 3200 J The kinetic energy is 3200 J. 2(c) i) Electronic configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. It describes how electrons are arranged around the nucleus. ii) • Protons are positively charged particles found in the nucleus of an atom, while electrons are negatively charged particles that orbit the nucleus. • Protons have a significantly larger mass compared to electrons (approximately 1836 times heavier). 2(d) Four importance of soil water: • It is essential for plant growth as it dissolves nutrients for absorption. • It helps in regulating soil temperature. • It facilitates the decomposition of organic matter by microorganisms. • It is a component of the soil solution, which transports nutrients. 3. a (i) α) Ecosystem: An ecosystem is a community of living organisms (biotic components) interacting with each other and with their non-living environment (abiotic components) in a particular area. β) Adaptation: Adaptation is a heritable trait that helps an organism survive and reproduce in its specific environment. It can be structural, physiological, or behavioral. μ) Habitat: A habitat is the natural environment or home where a particular organism lives. It provides the necessary resources for survival, such as food, water, and shelter. 3. a (ii) Three adaptations of a fish in its habitat: • Streamlined body shape: Reduces drag and allows for efficient movement through water. • Gills: Specialized organs for extracting oxygen from water. • Fins: Used for propulsion, steering, and maintaining balance in water. 3. b. Four uses of the periscope: • Used in submarines to see above the water surface. • Used in tanks to observe the surroundings from inside. • Used in trenches during warfare to observe enemy positions without exposing oneself. • Used by spectators in crowded events to see over obstacles. 3. c (i) • Hard water contains a high concentration of dissolved mineral ions, primarily calcium (Ca^2+) and magnesium (Mg^2+) ions. • Soft water contains a low concentration of these mineral ions. 3. c (ii) Two advantages of hard water over soft water: • It provides essential minerals like calcium and magnesium, which are beneficial for human health (e.g., bone development). • It has a better taste for drinking due to the dissolved minerals. 3. d (i) Fertilizer application is the process of adding nutrients to the soil or directly to plants to enhance plant growth and crop yield. 3. d (ii) Four methods of fertilizer application: • Broadcasting: Spreading fertilizer uniformly over the entire field. • Placement: Applying fertilizer in concentrated bands near the seeds or plants. • Foliar application: Spraying liquid fertilizer directly onto the leaves of plants. • Fertigation: Applying fertilizer dissolved in irrigation water. 4. a. Four importance of the carbon cycle: • It regulates the Earth's climate by controlling the concentration of carbon dioxide in the atmosphere. • It is essential for photosynthesis, providing carbon dioxide for plants to produce organic matter. • It facilitates the transfer of energy through ecosystems as carbon compounds move through food chains. • It is crucial for the formation of fossil fuels (coal, oil, natural gas) over geological time. 4. b. i) Soil structure: Refers to the arrangement of soil particles (sand, silt, clay) into aggregates or peds. It influences water infiltration, aeration, and root penetration. ii) Soil texture: Describes the relative proportions of different-sized mineral particles (sand, silt, and clay) in a soil. It determines how water and nutrients are held. iii) Soil porosity: The volume of pore spaces (empty spaces) within the soil, which can be filled with air or water. It affects aeration and water retention. iv) Soil capillarity: The ability of soil to draw water upwards against the force of gravity through its pore spaces, due to adhesive and cohesive forces. 4. c. (i) A compound is a substance formed when two or more different chemical elements are chemically bonded together in a fixed ratio. 4. c. (ii) Three differences between a compound and a mixture: • In a compound, elements are chemically bonded, forming new substances with different properties, while in a mixture, substances are physically combined and retain their original properties. • A compound has a fixed composition by mass, whereas a mixture has a variable composition. • The components of a compound can only be separated by chemical means, while the components of a mixture can be separated by physical means. 4. d. (i) Frictional force is a force that opposes motion or attempted motion between two surfaces in contact. 4. d. (ii) Three applications of friction: • Walking: Friction between shoes and the ground allows us to walk without slipping. • Braking: Friction in brakes helps to slow down or stop vehicles. • Writing: Friction between a pen/pencil and paper allows ink/graphite to be deposited. 5. a. (i) • Transpiration is the process by which plants release water vapor into the atmosphere, primarily through stomata on their leaves. It is mainly a physical process driven by water potential gradients. • Photosynthesis is the process by which green plants and some other organisms convert light energy into chemical energy, synthesizing sugars from carbon dioxide and water. It is a biochemical process. What's next?

i) Respiration is the biochemical process by which living organisms break down organic substances, like glucose, to release energy for metabolic activities.

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i) Respiration is the biochemical process by which living organisms break down organic substances, like glucose, to release energy for metabolic activities.

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