Science

• The ability to do work or any activity that requires action

  Energy
• The energy that an object has due to its position or motion

  Mechanical energy
• It is stored energy possessed by objects that are at rest

  Potential energy
• A form of stored energy possessed by an object due to its position relative to the ground

  Gravitational potential energy
• The energy possessed by objects that are moving

  Kinetic energy
• The form of energy possessed by sound waves

  Sound energy
• The energy possessed by an object due to the movement of particles within it. It is released in the form of heat

  Thermal energy
• Energy from within Earth

  Geothermal energy
• Thermal energy from bodies of water

  Hydrothermal energy
• This form of energy can travel through solids, liquids, gases, and even through a vacuum, such as outer space

  Radiant energy
• Electromagnetic waves carry radiant energy, also known as…

  Radiation
• A form of radiant energy that is visible to human eyes

  Light energy
• The most commonly used form of energy

  Electrical energy
• The energy which is stored in the bonds of chemical compounds

  Chemical energy
• It is stored in the nucleus of an atom and is released during nuclear reactions

  Nuclear energy
• It is the simplest of all machines, also known as ramp

  Inclined plane
• A long rigid bar that rotates around a fulcrum

  Lever
• A thin inclined plane wrapped around a cylinder

  Screw
• It can be viewed as a moving inclined plane used to cut objects

  Wedge
• A wheel attached to an axle is the best description of this type of simple machine

  Wheel and axle
• A simple machine that is used to redirect a force

  Pulley
• These are produced on the underside of the leaves called fronds


  Spores
• These do not have flowers or seeds to propagate, they reproduce through spores instead

  Ferns
• It releases sperm cells

  Antheridium
• It releases egg cells

  Archegonium
• The fern will develop ___, ___, and ___

  Roots, stems, and leaves
• A young leaf called ___, is curled and will unfurl into a frond as it matures

  Fiddlehead
• Small flowerless plants that do not have roots

  Mosses
• Thin, hairlike threads that hold mosses in the soil

  Rhizoids
• A green shoot

  Protonema
• They reproduce through male and female cones

  Cone-bearing plants or conifers
• A form of asexual reproduction in plants

  Vegetative propagation
• This involves other plant parts, aside from seeds and spores, to grow new plants without human effort

  Natural vegetative propagation
• Stems that grow horizontally above the ground 


  Runners or stolons
• Examples of runners or stolons are…

  Strawberry and bermuda grass
• Some plants grow small plants called ___ on the edges of the leaves. Examples are…


  Plantlets

  Begonia and katakataka plant
• New plants also grow from swollen roots, which do not only store water but also function as food storage for the plant. Examples are…

  Radish, carrot, sweet potato, and turnip
• These have a swollen underground stem

  Bulbs
• Example of bulbs are…

  Onions, garlics, tulips, and lilies
• Some plants grow through special stems called…

  Tubers