SCIENCE - Q3 - PERIODICAL

• Cell - Smallest unit of life
• Tissue - A group of cells that have similar structure and act together to perform a specific function
• Connective Tissue - it connects and separates group of other tissues
• Muscle Tissue - is what allows muscle to contract
• Nervous Tissue - which help nerve impulse travel
• Epithelial Tissue - covers the surfaces of organs and has roles in absorbing water and nutrients
• Vascular Tissue - Transport substances throughout the different parts of the plant
• Ground Tissue - serves as storage of starch, fats, oils proteins and water, and repairing damage tissue
• Epidermal Tissue - It is made up of a single layer of cells that covers a plant’s roots, stems, leaves and flowers
• Organ - It is formed when tissues are grouped together and work to do certain task within a living thing
• Heart - keep the blood flowing through the body
• Brain - the body’s control center
• KIDNEYS – filter blood and form urine which is excreted from the body
• LIVER – it also filters blood, secrete bile that is needed in digestion and producing proteins for blood clotting
• LUNGS – its main function is exchanging oxygen and carbon dioxide with the blood  
• Organ System - Organs that work together and do specific task
• Organism - Organism constitute of organ system that are organized and carry different functions so that it can survive
• Population - Defined as a group of individuals of the same specie living and interbreeding within a given area
• Community - Aka. Biological community, in biology it is an interacting group of various species in common location
• Ecosystem - It is composed of living things interacting with one another, together with non-living factors in the environment
• Biosphere - Region of the earth that encompasses all living organisms
• Wave - A disturbance that travels through a medium or a vacuum and carries energy
• Wave Pulse - A single unrepeated disturbance
• Wave Train - A succession of periodic disturbance
• Distance - How far away the wave has travelled
• Amplitude - Refers to the maximum amount of displacement of a particle
• Crest - The highest point in the wave
• Wavelength - Distance between two successive points
• Trough - The lowest point in a wave
• Speed - Distance travelled by a wave per unit time
• Period - Time taken for one complete cycle of the wave to pass a reference point
• Frequency - The number of waves produced per unit time, hertz
• Mechanical Waves - Require a medium to propagate
• Electromagnetic Waves - Require no medium to propagate
• Gamma Ray - Detect cracks in metals. Destroy cancer cells in a process called radiotheraphy
• X-Ray - Discovered by Wilhelm Conrad Roentgen in 1895
• Ultraviolet Ray - Discovered by Johann Wilhelm Ritter. The Sun is the main source of UV rays
• Visible Light - The only electromagnetic wave that we can see.
• Infrared Light - Discovered by Sir William Herschel. Also known as Heat Wave
• Microwave - Discovered by James Clark Maxwell in 1864