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Plant Study Ag Sci
Leaving Cert Ag Science
Term | Definition |
---|---|
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 |