Quick Review Flashcards - Click to flip and test your knowledge!
Question
What are two beneficial roles performed by 'invisible helper' microbes in the human body?
Answer
They help digest food and produce medicines.
Question
What is the primary negative impact of harmful microbes on human health?
Answer
They cause infections.
Question
List four key factors that help the human body stay healthy and fight infections.
Answer
Nutritious food, exercise, medicines, and vaccines.
Question
What is a common practical application of the heating effect of electric current?
Answer
Keeping us warm (e.g. through heaters).
Question
In what way is the magnetic effect of electric current utilised in technology?
Answer
It helps motors run and machines function.
Question
What are the three ways fundamental forces can change an object's motion?
Answer
They can make objects speed up, slow down, or change direction.
Question
Concept: Pressure
Answer
Definition: The distribution of a force over an object.
Question
How does air movement relate to atmospheric pressure?
Answer
Differences in pressure result in air movement, ranging from gentle breezes to strong winds.
Question
What specific atmospheric condition can lead to the formation of a cyclone?
Answer
A strong pressure difference.
Question
Describe the movement of particles in a solid material.
Answer
The particles cannot move much.
Question
Describe the movement of particles in a gas.
Answer
The particles can move around freely.
Question
Term: Element
Answer
Definition: A pure substance consisting of only one type of matter.
Question
Term: Compound
Answer
Definition: A substance formed when two or more elements are bonded together.
Question
Term: Mixture
Answer
Definition: A combination of materials that can be separated physically.
Question
What occurs at a particle level when sugar dissolves in tea?
Answer
The particles combine to form a solution.
Question
How does light behave when it passes through a lens?
Answer
The light rays bend.
Question
Which two types of mirrors are mentioned as surfaces that reflect light rays?
Answer
Flat mirrors and curved mirrors.
Question
How do corrective glasses assist individuals with vision problems?
Answer
They use lenses to bend light so the wearer can see clearly.
Question
Besides polished mirrors, name two other types of surfaces that reflect light.
Answer
Rough surfaces and the Moon.
Question
What causes the different 'phases' of the Moon visible from Earth?
Answer
The relative positions of the Earth, Moon, and Sun.
Question
Which periodic astronomical cycle allowed humans to develop the first calendars?
Answer
The phases of the Moon.
Question
Term: Ecosystem
Answer
Definition: The complex relationships between living organisms and their environment.
Question
List four environmental factors that living organisms depend on and respond to.
Answer
Air, water, sunlight, and other organisms.
Question
What determines why water remains liquid on Earth rather than freezing or evaporating?
Answer
Earth lies at the perfect distance from the Sun.
Question
What are the two primary protective functions of Earth's atmosphere?
Answer
It provides oxygen for breathing and shields the planet from harmful ultraviolet rays.
Question
According to the text, what is the primary cause of modern climate pattern disruptions?
Answer
Human activities that cause small changes in the Earth's temperature.
Question
In scientific investigation, what is the purpose of 'focused questions'?
Answer
They serve as starting points for designing experiments to improve understanding.
Question
What does 'investigation in science' involve beyond just asking simple questions?
Answer
Designing experiments, making careful observations, and explaining findings clearly.
Question
When conducting a scientific experiment, why is it important to change only one variable at a time?
Answer
To ensure that the observed results are caused by that specific change.
Question
In the 'puri frying' experiment, name three variables that a scientist can control.
Answer
Dough thickness, flour type, and oil temperature.
Question
In the 'puri frying' experiment, what is one quantitative variable that can be measured?
Answer
The time it takes for the dough to puff up (in seconds).
Question
What is a 'binary' (yes/no) observation that can be made when frying dough?
Answer
Whether or not the dough puffs up.
Question
What sensory details should be recorded in notes during an experiment like frying?
Answer
Observations of smell, smoke, or splattering oil.
Question
How can the method of dropping dough into oil (e.g. vertical vs angled) be classified in an experiment?
Answer
As a variable that the investigator can control.
Question
What does a scientist do after completing one round of experiments?
Answer
They use the observations to improve understanding and ask new questions.
Question
The process of using questions to observe, experiment, and explain is known as _____ investigation.
Answer
Systematic
Question
True or False: Scientific investigation requires a fancy laboratory.
Answer
False; simple experiments can be done in everyday places like a kitchen.
Question
What is the primary role of 'curiosity' in the investigative world of science?
Answer
It acts as a guide for exploring the world and solving difficult problems.
Question
How does the 'heating effect' of electricity differ from the 'magnetic effect' in terms of daily application?
Answer
Heating provides warmth, while magnetic effects power mechanical movement in motors.
Question
What defines the 'Investigative World of Science' in Grade 8?
Answer
The combination of wonder and the evolution of ideas into a systematic way of working.
Question
How do scientific ideas change over time according to the Grade 7 curriculum summary?
Answer
They evolve slowly as each answer opens up new questions and deeper exploration.
Question
Which force is responsible for a ball falling back to the ground after being thrown up?
Answer
Gravity (identified as a fundamental force in the text context).
Question
Why is classifying materials into elements, compounds, and mixtures important in science?
Answer
It helps scientists understand how different materials combine, mix, and can be separated.
Question
What is the relationship between light reflection and a shiny metal spoon?
Answer
The spoon acts as a curved mirror that reflects light to form an image.
Question
How are human routines on Earth linked to objects far beyond our planet?
Answer
Our calendars are based on the periodic motions of the Sun and the Moon.
Question
According to the text, what is the 'heart' of both environmental problems and their solutions?
Answer
Human beings and our use of science to guide our actions.
Question
In an experiment, variables that are kept the same to ensure a fair test are called _____ variables.
Answer
Controlled
Question
What is the relationship between force and area in the context of pressure?
Answer
Pressure is the force distributed over a specific area of an object.
Question
What is the effect of 'human activities' on the Earth's atmosphere as mentioned in the final chapter summary?
Answer
They cause temperature changes that disrupt climate patterns.
Question
Scientific investigation works best when balancing careful observation with _____.
Answer
Creative thinking
Question
What does a scientist do with observations after an experiment is performed?
Answer
Uses them to improve their understanding of the phenomenon.
Question
How does the text define 'Investigation in science'?
Answer
Asking focused questions, designing experiments, and using observations to improve understanding.
Question
Which fundamental principle allows objects to change their speed?
Answer
The application of force.
Question
What is the primary difference between how elements and mixtures are combined?
Answer
Elements in a compound are bonded together, whereas mixtures are combined and can be separated physically.
Question
How does the Moon produce light visible from Earth?
Answer
It reflects light from the Sun.
Question
Why is 'one side of a puri thinner than the other' considered a scientific question?
Answer
Because it is an everyday phenomenon that can be investigated through observation and experimentation.
Question
Which Grade 6 concept is described as the starting point of science?
Answer
Wonder and simple 'Why?' and 'How?' questions.
Question
In the context of investigation, what does 'observing carefully' lead to?
Answer
The ability to explain clearly what is seen.
Question
What role does the atmosphere play regarding ultraviolet (UV) radiation?
Answer
It acts as a shield to protect life on Earth.
Question
How are ecosystems described in relation to the size of organisms?
Answer
They involve all beings, from the tiniest insect to the largest whale.