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Week 3 Vocabulary
Term | Definition |
---|---|
Photosynthesis | Photosynthesis is the process by which plants use sunlight to convert water and carbon dioxide into simple sugars |
Cellular Respiration | What cells do to break up sugars into a form that the cell can use as energy |
Chlorophyll | A green pigment that traps energy from the sun |
Glucose | A simple sugar that is an important energy source in living organisms and is a component of many carbohydrates |
Epidermis | The outer layer of cells covering an organism, in particular |
Stomata | Any of the minute pores in the epidermis of the leaf or stem of a plant, forming a slit of variable width that allows movement of gases in and out of the intercellular spaces |
Transpiration | The process in plants by which water is taken up by the roots and released as water vapor through stomata in the leaves |
Carbon Dioxide | A waste product made by cells of the body; a gas in the air made of carbon and oxygen atoms: Humans rid themselves of carbon dioxide waste by exhaling, or breathing out |
Oxygen | An element that makes up about 21% of Earth's atmosphere; a gas in Earth's atmosphere and in water that living organisms breathe |
Guard Cells | Each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells |
Cellulose | An insoluble substance that is the main constituent of plant cell walls and of vegetable fibers such as cotton. It is a polysaccharide consisting of chains of glucose monomers |
Tropism | The turning of all or part of an organism in a particular direction in response to an external stimulus |
Xylem | The vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem |
Phloem | The vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves |