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PLANT DEFINITIONS
9. plant science defintions
| Term | Definition |
|---|---|
| TRANSPIRATION | the loss of water vapour from the leaves and stems of plants |
| XEROPHYTES | plants that are adapted to grow in very dry habitats |
| CAM PHYSIOLOGY | allows the opening of the stomata during the nights instead of hot days |
| TRANSPIRATION STREAM | the column of water connecting the roots, stem, leaves and air spaces |
| TRANSPIRATION PULL | the low pressure or suction caused inside xylem tubes |
| ACTIVE TRANSLOCATION | the movement of sugars and amino acids inside phloem tissue |
| SOURCES | parts of plants where photosynthesis occurs: stems and leaves |
| SINK | parts of plant that take photosynthetic products: roots, growing fruits and the developing seeds |
| FLOWER | structures used by flowering plants for sexual reproduction |
| ZYGOTE | the fusion of a male gamete with the female gamete inside the ovule |
| FERTILIZATION | the process of formation of a zygote |
| POLLINATION | the transfer of pollen from an anther to a stigma |
| MERISTEMS | regions where plants continue to grow, often throughout their life |
| AUXIN | a plant hormone, which acts as a growth promoter |
| PHOTOTROPISM | directional growth in response to the source of light |
| ANGIOSPERMS | flowering plants |
| MYCHORRHIZA | mutualistic relationship between roots and fungi |
| TURGOR PRESSURE | the pressure from cells when they become rigid and press on adjacent cells from having vacuoles filled with water |
| COHESION-TENSION THEORY | explains the movement of water in the xylem tension: negative pressure from the loss of water vapour cohesion: the forces of attraction between water molecules due to hydrogen bonding |
| TRANSLOCATION | the movement of organic molecules through the phloem tissue of plants |
| CROSS POLLINATION | when pollen travelles from the anthers of one plant to the stigma of another plant |
| SELF POLLINATION | if pollen in deposited in the stigma of the same plant that produced it |
| TESTA | the hard protective seed coat |
| MICROPYLE | a pore in the testa through which water is absorbed |
| IMBIBITION | the process through which water enters the seed |
| ALEURONE LAYER | the cells which gibberellin simulates the synthesis of amylase |
| ENDOSPERM | food store where the amylase hyrodlyses starch molecules |
| RADICLE | embryo root |
| PLUMULE | embryo shoot |
| PHOTOPERIODISM | the plants responses to the relative periods of darkness and light |
| PHOTOCROME | the pigment in the leaf which causes the plants response to periods of darkness |
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izzy-
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