Podcast
Questions and Answers
Which cellular structure is primarily responsible for generating energy through respiration?
Which cellular structure is primarily responsible for generating energy through respiration?
- Sap Vacuole
- Chloroplast
- Nucleus
- Mitochondrion (correct)
What is the primary role of a vacuole in a plant cell that is not typically observed in animal cells?
What is the primary role of a vacuole in a plant cell that is not typically observed in animal cells?
- Controlling cell division
- Generating energy
- Synthesizing proteins
- Storing water and maintaining cell turgor (correct)
During which alignment of the Earth, Moon, and Sun are the highest high tides most likely to occur?
During which alignment of the Earth, Moon, and Sun are the highest high tides most likely to occur?
- When they are randomly positioned
- When they are aligned in a straight line (correct)
- When the Moon is between the Earth and the Sun
- When they form a right angle
Why do models predicting tide heights not always provide perfectly accurate forecasts?
Why do models predicting tide heights not always provide perfectly accurate forecasts?
In the context of a vacuum flask, what is the purpose of the vacuum space?
In the context of a vacuum flask, what is the purpose of the vacuum space?
Why are alloys, like steel, often preferred over pure metals, such as iron, in many applications?
Why are alloys, like steel, often preferred over pure metals, such as iron, in many applications?
According to the plant identification key, what is the first characteristic to consider when identifying a plant?
According to the plant identification key, what is the first characteristic to consider when identifying a plant?
Lily is walking across a room. Which of the following energy transfers is most likely occurring within Lily's body?
Lily is walking across a room. Which of the following energy transfers is most likely occurring within Lily's body?
What term describes energy that is converted to a less useful form, such as heat radiating from a light bulb?
What term describes energy that is converted to a less useful form, such as heat radiating from a light bulb?
In an experiment to identify gases in test tubes, what is a common test to confirm the presence of oxygen?
In an experiment to identify gases in test tubes, what is a common test to confirm the presence of oxygen?
Which property of air allows sound to be heard outside the bell jar when the hammer hits the bell?
Which property of air allows sound to be heard outside the bell jar when the hammer hits the bell?
In Youssef’s experiment about melting ice, why might placing ice cubes on top of a rock in one container, and at the bottom in another, affect the final water level after melting?
In Youssef’s experiment about melting ice, why might placing ice cubes on top of a rock in one container, and at the bottom in another, affect the final water level after melting?
In an experiment measuring students’ heights, why should students remove their shoes?
In an experiment measuring students’ heights, why should students remove their shoes?
Why is it important to record the heights of participants in the same units?
Why is it important to record the heights of participants in the same units?
Anastasia is testing solutions to determine if they are acidic, alkaline, or neutral. Which observation indicates that a solution is alkaline?
Anastasia is testing solutions to determine if they are acidic, alkaline, or neutral. Which observation indicates that a solution is alkaline?
What would suggest that different solutions have the same pH value?
What would suggest that different solutions have the same pH value?
In Priya's circuit, what is the purpose of the lamp?
In Priya's circuit, what is the purpose of the lamp?
Which materials would Priya predict to be electrical conductors?
Which materials would Priya predict to be electrical conductors?
What is the primary scientific benefit of repeating an investigation?
What is the primary scientific benefit of repeating an investigation?
In the water cycle diagram, what is the process by which water changes from a liquid to a gas and rises into the atmosphere?
In the water cycle diagram, what is the process by which water changes from a liquid to a gas and rises into the atmosphere?
Flashcards
Cell Structure
Cell Structure
Structures within cells, like chloroplasts or nuclei.
Chloroplast Function
Chloroplast Function
The green pigment in plants needed for photosynthesis.
Cytoplasm Function
Cytoplasm Function
Jelly-like substance where chemical reactions happen.
Nucleus Function
Nucleus Function
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Mitochondrion Function
Mitochondrion Function
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Sap Vacuole Function
Sap Vacuole Function
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Force Orbiting the Sun
Force Orbiting the Sun
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What is an alloy?
What is an alloy?
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Why repeat investigations?
Why repeat investigations?
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Evaporation
Evaporation
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Condensation
Condensation
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Electrical Conductor
Electrical Conductor
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Lamp in a Circuit
Lamp in a Circuit
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Study Notes
- This is a Science exam for Stage 7, Paper 1, in 2025
- The test duration is 45 minutes, and no additional materials are needed
Cells
- Chloroplasts are cell structures that facilitate photosynthesis by containing green pigment
- Cytoplasm is where energy is released within a cell
- The nucleus serves as the control center for a cell
- Mitochondria help prevent a cell from collapsing and shrinking
- Sap vacuoles are where chemical reactions transpire
- Plant cells contain structures not found in animal cells
Tides and Tidal Forces
- The force that holds the Earth in orbit around the Sun is gravity
- The highest high tides occur when the Earth, Moon, and Sun align in a straight line
- Models depicting the movement of the Earth, Moon, and Sun support the prediction of tide heights
- Models do not always predict the tide heights accurately, factors like weather conditions etc cause deviation
Vacuum Flask and Particle Models
- Vacuum flasks prevent hot drinks from getting cold quickly
- A vacuum is represented by particle model D because it contains empty space, signifying the absence of particles
- Steel is an alloy that contains iron
- Alloys of steel are employed instead of pure iron because they have enhanced properties, such as increased strength and resistance to corrosion
Plant Identification Key
- Chen uses a key to identify plants in his garden
Energy Transformations
- Lily's body uses chemical energy from food when she walks across a room
- As Lily walks, some energy is converted into heat and sound
- A lamp transfers electrical energy into light when Lily switches it on
- "Wasted" describes the energy that becomes less useful
Chemical Tests on Gases
- An investigation needs to be made to identify test-tubes containing oxygen and carbon dioxide
Factors that affect sound
- Carlos hears a sound because vibrations travel through the air from the bell to his ears
- Carlos does not hear the bell in a vacuum because there is no air to carry the sound vibrations
Ice Melting Experiment
- One piece of equipment Youssef needs is a ruler to measure the height of water
- The melting of ice on land increases the sea level
Height Measurement Experiment
- Blessy asks Class 7 learners to remove shoes to improve accuracy and standardize measurements
- The teacher doesn't want Blessy standing on a chair as it could be dangerous
- Standardizing units in the table improves data interpretation
Chemical Properties of Solutions
- Anastasia investigates four solutions to determine their acidity, alkalinity, or neutrality
- Litmus paper is used in the experiment
- A way to show two solutions have the same pH value is that they both turn red or blue litmus paper the same color
Electrical Conductivity Investigation
- Priya uses a lamp in her circuit to see if current flows
- Copper and aluminum are predicted as electrical conductors
- Repeating the investigation improves reliability
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