BIO

• Biodegradable

  Decomposition by microorganisms
• Problems with plastics:
• Marine animals and fish can get trapped
• Can be ingested by animals
• Associated epithelial cells found in the lungs and in the Fallopian tubes of the female
• Clia cells move mutually to move egg from ovary
• Plant cells


  Develop a thick wall as they develop, they also love the cell contents so make it easy to transport water from roots to leaves</a>
• Tissue


  A group of similar cells that work together to carry out one operation
• Toxic liquids leak into surrounding lands
• Disease spread from waste dumps
• Decomposition of organic matter releases methane
• Problems with deforestation include frequent flooding and thin layers of soil
• Organ


  A group of tissues that perform one or more functions for the body
• Lack of energy can destroy green plants
• Complex organic compounds


  Made up of carbon, hydrogen, oxygen and sometimes other elements
• Sucrose


  Glucose + Fructose
• Peptides


  Shorter polypeptides
• Peptidases

  Break down peptides into amino acids
• Pollution introduces harmful substances into the environment
• Cell wall


  Found only in plant cells, provides structural support
• Fertilizers (excess) cause eutrophication
• Cell membrane


  Keeps contents of the cell separate from the external environment
• Important marine ecosystems include coral reefs
• Greenhouse gases trap heat in the environment
• Photosynthesis


  Plants use light energy to drive chemical reactions and convert carbon dioxide and water to glucose and oxygen
• Sucrose


  Stored in storage organs of plants
• Starch


  Stored in leaves of plants to store energy
• Cellulose


  Used by plants to make cell walls
• Chlorophyll


  Green pigment in plants that absorbs light
• Large surface area


  Allows plants to absorb as much light as possible
• Xylem and phloem


  Transport water, nutrients and food through the plant
• Diffusion


  Movement of substances from an area of high concentration to an area of low concentration
• Nucleus


  Controls all the activities of the cell and contains the chromosomes
• Ribosome


  Site of protein synthesis
• Mitochondria

  Carry out cellular respiration
• Chloroplast


  Found only in plant cells, site of photosynthesis
• Vacuole


  Large and full of cell sap
• Epidermis


  Outer layer of leaf
• Palisade mesophyll


  Contains many chloroplasts
• Spongy mesophyll


  Allows gas exchange