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15 Cards in this Set
- Front
- Back
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Essential Element |
- An element or compound required for normal growth and reproduction |
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Limiting Nutrients |
- Nutrients that, if absent, slow the growth of plants - Nitrogen, phosphorous and potassium |
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Mobile Nutrients |
- Travel from older leaves to younger leaves when there is a nutrient deficiency - Scarcity is reflected in old leaves |
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Hydroponic Growth |
- Takes place in water without soul so scientists can control and study nutrients in a plant |
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Humus |
- dead cells, tissues and feces in soil |
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Texture of soil |
- The proportions of gravel, sand, silt and clay in soil |
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Loams |
- Most fertile topsoils - Contain equal amounts of sand, silt and clay with organic matter |
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Anions |
- Negative charge - Usually dissolve in water - Readily available for absorption by plants - Also easily washed out of soil by rain |
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Leaching |
- Loss of nutrients via the movement of water through soil |
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Cations |
- Positive charge - Dissolve in soil but are not readily absorbed - In solution, cations interact with negative charges on two types of soil |
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How do Cations enter a Cell? |
- Through channels |
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How do Anions enter a Cell? |
- Via cotransporters which act as symporters (in the same direction) |
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Metallothions |
- Work in Active exclusion of ions from plants when the toxins are already in plant - Bind to toxins |
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Antiporters (tonoplast) |
- Located in the membrane of large central vacuole called the tonoplast - Pump toxins into vacuole to be degraded |
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Epiphytes |
- Plants that live on other plants and don't make contact with soil |
