Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2004PP1QN19
Explain how a biotic factors affect plants
answers
Wind.
In windy conditions the rate of transpiration increases; wind disperses fruits/ seeds; is an agent of pollination; acc. Spores for seed. Temperature Changes in temperatures affects the rate of photosynthesis and other biochemical reactions/ metabolic reactions/ enzymatic reactions/ enzymatic reactions, temperature increases rate of transpiration; Lights Plants need light for photosynthesis, some plants need light for flowering/ photoperiodism/ seeds like lettuce require light for germination. Humidity When humidity is low, the rate of transpiration increases; PH Each plant requires a specific pH to grow well/ acidic/ alkalinity/ neutral; Salinity Plants with salt tolerant tissues grow in saline area, plants in estuaries adjust to salt fluctuations; Topography North facing slopes in temperature lands have more plants than south facing slope Plants on windward side have stunted/ distorted growth; Comparisons of mountains and valleys Description of other areas with other topographies e.g. River valley rainfall/ water - Fewer plants in areas/ semi arid and - Water is needed for germination/ is a raw material for photosynthesis/ dissolves/ minerals salts/ provides turgidity for support/ fruits/ seeds Pressure; Variation in atmospheric pressure affect availability of CO+2+ which affects photosynthesis and low pressure increase rate of transpiration; and affect amount of oxygen; for respiration Mineral salts/ trace elements - Affects distribution of plants in the soils - Plants thrive well where there are mineral salts in the soil Plants living in the soil deficient in particular mineral element have special methods obtaining it; for example legumes obtaining from nitrogen by fixation or carnivorous.
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