Science Revision (7A, 7C, 7G, 7H, 7I & 7K)

<p>Making food by photosynthesis (B)</p> Signup and view all the answers

<p>Tissues (B)</p> Signup and view all the answers

<p>Heart (B)</p> Signup and view all the answers

<p>Controls movement of substances in and out of the cell (A)</p> Signup and view all the answers

<p>Cleaning the blood and producing urine (D)</p> Signup and view all the answers

<p>Circulatory System (D)</p> Signup and view all the answers

<p>Cell Wall (A)</p> Signup and view all the answers

<p>It contracts and moves downwards (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Ventilation</p> Signup and view all the answers

<p>diaphragm</p> Signup and view all the answers

<p>Inhale = Breathing in Exhale = Breathing out Antagonistic Pairs = Pairs of muscles that work in opposite directions Pulse = Feeling of the heartbeat</p> Signup and view all the answers

<p>Caffeine (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Gas Exchange</p> Signup and view all the answers

<p>Locomotor</p> Signup and view all the answers

<p>They contract to push air out (B)</p> Signup and view all the answers

<p>Can flow (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>The movement of particles spreading out and mixing with each other.</p> Signup and view all the answers

<p>vacuum</p> Signup and view all the answers

<p>Solid = Fixed shape and volume Liquid = No fixed shape but fixed volume Gas = No fixed shape or volume Plasma = Ionized state of matter</p> Signup and view all the answers

<p>Fixed volume (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>0.000000001 metres</p> Signup and view all the answers

<p>wall</p> Signup and view all the answers

<p>They vibrate in fixed positions. (C)</p> Signup and view all the answers

<p>High melting point (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Atom</p> Signup and view all the answers

<p>thermal</p> Signup and view all the answers

<p>Iron = Malleable Oxygen = Gas at room temperature Mercury = Liquid metal Sodium = Highly reactive metal</p> Signup and view all the answers

<p>Compounds can be formed through chemical reactions. (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Silicon Dioxide</p> Signup and view all the answers

<p>reactants</p> Signup and view all the answers

<p>Iron (B)</p> Signup and view all the answers

<p>Joule (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Thermal Energy</p> Signup and view all the answers

<p>organisms</p> Signup and view all the answers

<p>Chemical Energy = Energy stored in food and fuel Kinetic Energy = Energy of moving objects Gravitational Potential Energy = Energy stored due to an object's height Strain Energy = Energy stored in stretched or compressed objects</p> Signup and view all the answers

<p>Solar Power (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Releases polluting gases</p> Signup and view all the answers

<p>wires</p> Signup and view all the answers

<p>Uranium (A)</p> Signup and view all the answers

<p>Newton (N) (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Extension is proportional to the force applied.</p> Signup and view all the answers

<p>upthrust</p> Signup and view all the answers

<p>Gravity = Pulls objects downwards Air Resistance = Acts on objects moving through the air Water Resistance = Acts on objects moving through water Magnetism = Attracts objects made of iron, nickel or cobalt</p> Signup and view all the answers

<p>Gravity (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>The spring cannot return to its original length.</p> Signup and view all the answers

<p>limit of proportionality</p> Signup and view all the answers

<p>To measure the force (D)</p> Signup and view all the answers

The most basic unit of life - all living things are made of cells.

The control center of the cell, containing DNA which directs the cell's activities.

The jelly-like substance inside a cell where chemical reactions take place.

Organelles responsible for respiration, releasing energy for the cell.

The thin outer layer of a cell, controlling what enters and leaves.

The outer layer of plant cells, providing support and rigidity.

A large, fluid-filled sac in plant cells, storing water and nutrients.

Green organelles in plant cells, responsible for photosynthesis - making food using sunlight.

Groups of similar cells that work together to perform a specific function.

A group of different tissues that work together to carry out a specific function.

The movement of air into and out of the lungs.

The process by which oxygen is used to release energy and carbon dioxide is produced.

Pairs of muscles that work together to create movement in opposite directions.

Connects muscle to bone.

Connects bone to bone.

The feeling of the heart beating that can be felt in the arteries.

Drugs taken for enjoyment or pleasure.

The time taken to respond to a stimulus.

Substances that speed up the nervous system, making impulses travel faster.

Substances that slow down the nervous system, making impulses travel slower.

The three forms that a substance can be in; solid, liquid or gas.

The amount of room something takes up. Measured in cubic centimeters (cm³).

Squashed into a smaller volume.

Tiny pieces of matter that everything is made out of.

A theory used to explain the different properties and observations of solids, liquids, and gases.

An erratic movement of small specks of matter caused by being hit by the moving particles that make up liquids or gases.

The movement of particles spreading out and mixing with each other without anything moving them. Occurs quickly in gases because they are able to move freely in all directions.

The force on a certain area caused by air molecules hitting it.

A completely empty space containing no particles (not even air).

Straws work because when you suck, you reduce the pressure inside the straw so the air pressure outside the straw is greater and the liquid is pushed up.

The smallest particles of matter that make up everything.

A substance made up of only one type of atom.

A substance made up of two or more different types of atoms chemically combined.

The ability of a substance to conduct heat or electricity.

The process of breaking down a compound into simpler substances using heat.

A chemical change where new substances are formed.

A change in which no new substances are formed, only the arrangement of the substances changes.

A substance made up of only one type of element or compound.

A mixture of different substances that are not chemically bonded.

Two or more atoms joined together in a group.

The amount of force with which gravity pulls things. It is measured in Newtons (N).

The energy stored in objects in high places that can fall down.

A substance that contains a store of chemical or nuclear energy that can easily be transferred.

The idea that energy can never be created or destroyed, only transferred from one store to another.

A fossil fuel formed from the dead remains of microscopic dead plants and animals that lived in the sea.

Generating electricity using energy from the Sun.

Electricity generated by moving water turning turbines and generators.

The process by which plants use sunlight, carbon dioxide and water to make food (glucose) and release oxygen.

Cheap and convenient to use, but they are non-renewable and release polluting gases when burned.

No polluting gases generated, but they are non-renewable, very expensive, and produce dangerous waste materials.

A push or a pull on an object.

Forces that require direct contact between objects. Examples include friction, upthrust, air resistance, and water resistance.

The upward force exerted by a fluid (like water or air) on an object immersed in it.

The force that opposes the motion of an object through air.

The force that opposes the motion of an object through water.

Forces that can act on an object from a distance. Examples include gravity, static electricity, and magnetism.

The force that pulls everything towards the center of the Earth.

A force that attracts or repels certain materials, like iron, nickel, or cobalt.

A force that occurs when objects have different electrical charges; opposites attract, and likes repel.

The force needed to stretch a spring, and it is directly proportional to its extension. That means if you double the force, you double the extension, until you reach the limit of proportionality.