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36 Cards in this Set

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Carnivore
An organism that eats animals
Chemical energy
Energy in a substance that can be released by chemical reaction to produce different forms of energy
Chlorophyll
A substance found in GREEN plant. Its function is to absorb sunlight for photosynthesis to occur
Coal
A natural fuel formed by plant remains after many years
Energy
Define as the ability to do work. Exists in many forms, which can be converted from one to another.
Food chain
Diagrammatic illustration to show the flow of energy from one organism to another in the ecosystem
Fossil fuel
eg: oil, natural gas, coal
Solid, liquid or gaseous fuels formed in the ground after millions of years by chemical changes in plant and animal remains under high temperature and pressure.
Herbivore
An animal that feeds on grass and plants
Joule
SI units for measuring energy.

SI = standard international
Omnivore
An animal that feeds on both plants and animals
Opaque
Does not allow light to pass through
Orbit
The path where planets revolved in
Photosynthesis
A process by which green plants, algae and some bacteria absorb light energy and use it to manufacture food
Predator
An animal that kills its prey and then feeds on it
Prey
An animal that is being hunted by its predator
Reflection
The return of rays, beams of light or sonuds from a surface
Refraction
Bending of waves of light as they travel from one medium to another medium
Thermal energy
Energy cause by heat
Solar radiation
Heat energy from Sun
Translucent
Allows some light to pass through
Transparent
Allows all the light to pass through
Water Cycle
A continuous change of states of water to keep or maintain the supply of water on Earth
Carbon dioxide + water
sugar + oxygen
Decomposer
Living things that feed on dead bodies of plants and animals. Eg: bacteria, fungi, maggots, earthworms etc.
Photosynthesis
The process in which plants make food in the leaves in the presence of sunlight and carbon dioxide to produce sugar and oxygen
Boiling
The temperature at which a substance changes from liquid to gas
Condensation
The process in which water vapor looses heat to form water droplets in a cooler environment or cooler surface
Evaporation
Water in liquid state gains heat energy and changes to water vapor ( gaseous state )
Freezing
The temperature at which a substance changes from liquid to solid state
Melting
From solid to liquid
Factors affecting rate of evaporation
1. Temperature
2. Presence of wind
3. Area of exposed surface
4. Humidity of the air.
Humidity
measure of the amount of water vapor in the air
Why we feel hotter when the humidity is high?
(Singapore is a humid country)
When humidity is high, our sweat does not evaporate easily.
Water vapour
Water in its gaseous state and is formed when water evaporates, which occurs at any temperature.
Steam
Water in its gaseous state and it is formed when liquid boils.
1. Melting point
2. Boiling point
3. Freezing point of water
1. 0 degree celsius.
2. 100 degree celsius.
3. 0 degree celsius.