About Lesson
Explain how abiotic factors affect plants
- Wind – Windy conditions increase transpiration rate; Wind disperses fruits/seeds/spores; It is also an agent of pollination;
- Temperature – A change in temperature affects the rate of enzymatic reactions like photosynthesis and metabolic reactions; Also affects the transpiration rate. It is also a factor in germination.
- Ligh – Green plants need light for photosynthesis; Some plants need it for flowering; Some seeds (like lattice) require it for germination;
- Humidity – humidity affects transpiration rate;
- pH– Each plant requires specific pH to grow well;
- Salinity– Plants with salt tolerant tissues (e.g. mangrove) grow in saline areas; plants in estuaries adjust to salt fluctuations;
- Water – Water is needed for germination; Water as a raw material for photosynthesis; Water acts as a solvent; Water enhances turgidity; Water enhances the dispersal of some fruits; A medium of transport of plant nutrients;
- Mineral salts– Plants thrive (grow well in soils with mineral salts). Plants living in soil with a deficiency of a particular element have special methods of obtaining it. Legumes obtain nitrogen by nitrogen fixation /carnivorous plants/insectivorous plants, carnivorous trees obtain their nutrients from the mycorrhizal association;
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