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Plant Study Ag Sci

Leaving Cert Ag Science

TermDefinition
mitochondria Cell Organelles where energy is released.
Ribosomes Cell organelles where proteins are synthesised
Selectively Permeable Cell membrane permeability where certain molecules are permitted to enter & leave the cell
Angiosperms Plants that flower
Gymnosperms Plants that do not flower
Mosses & Ferns Non seed producing plants
Annuals Plants that germinate, grow, flower & reproduce in one year
Biennials Plants that germinate & grow in year 1; flower & reproduce in their 2nd year
Perennials Plants that flower & reproduce every year
Ephemerals Plants that flower & reproduce many times over a season
Sugar Beet A crop sown on farms that is a example of a biennial plant
Thistle A biennial Weed
Barley An Annual plant sown on farms
Diffusion Movement of molecules from a region of high concentration to low concentration
osmosis Movement of molecules from a region of high concentration to a region of low concentration across a semi permeable membrane (Passive)
Active trnasport Movement of molecules from a region of low concentration to a region of high concentration. Energy is needed for this process
Example of Diffusion in plants Gases leaving & entering the leaf
Example of Osmosis in plants Process by which water enters plant roots
Example of Active Transport in plants Process by which nutrients from the soil are taken into roots of plants
stomata Pores found on the underside of leaves
Transpiration Process by which plants lose water from their leaves
Xylem Vascular tissue used in plants to transfer water & dissolved minerals up a plant
Phloem Vascular tissue found in plants that transport dissolved food nutrients up and down plants
Translocation Movement of sugars / food nutrients up and down plants
Turgidity Pressure exerted by water filled vacuoles resulting in a pressing of the membrane against the cell wall.
Plasmolysis A process seen in plant cells whereby water is lost from the vacuole of the cell; cell membranes detaches from cell wall & the plant is seen to wilt
Created by: shellywallace
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