Unit 5 Lesson 1

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Unit 5Lesson 1

• Environmental Factors on Plant Growth

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What is a biome?

• The complex of living communities maintained by
  the climate of a region and characterized by a
  distinctive type of vegetation.
• Examples of biomes in North America include the
• tundra, desert, prairie, and the western
  coniferous forests.

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What type of plants would grow best in each
biome?

• Those which are naturally adapted to the
  environment, or native plants.

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Cultural Practices

• In order to control or mange light, temperature,
  air, nutrients and water to maximize agriculture
  production, agriculturalists utilize. These
  cultural practices allow us to grow plants in
  certain environmental conditions that they are
  not native to.

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Environment Affects Plant Growth

• Plant growth is affected by the environment.
  Factors that affect plant growth are light,
  water, nutrients and temperature. Each factor
  affects specific processes or a combination of
  processes within the plant that directly relates
  to plant growth and development.

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Light

• Light is essential for plant growth. Normal plant
  growth requires the full range of visible
  spectrum of sunlight. Plants react to light
  through the processes of photosynthesis,
  phototropism (where hormones stimulate
  longitudinal growth of the plants stem towards
  the light source) and photoperiodism (the growth
  of plants according to the number of light and
  dark hours or day length).

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Water

• Water is considered an essential element in plant
  growth, and the moisture content of plants can
  vary from 15 to 95 percent of the plants fresh
  weight. Although all plants require water, the
  amount of water required differs with each plant
  species.

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Nutrients

• Plants also have nutritional needs in order to
  grow and properly develop. Plants require larger
  amounts of certain nutrients (macronutrients) and
  smaller amounts of other nutrients
  (micronutrients). Plant growth depends on the
  availability of the essential nutrients to be
  available to the plant. Absorption and osmosis
  are the processes in which nutrients are taken up
  by the plant.

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Temperature

• Temperature can influence plant growth positively
  or negatively. Because plants have a large
  surface area, it is difficult for plants to
  regulate their own temperature. Temperatures
  above or below the optimum growing temperature of
  68 to 95 degrees will reduce carbon fixation
  within the plant, reducing the growth rate of
  plants.

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What makes these plants grow best in these
environments?

• They have the correct amount of water, light,
  temperature and air that they require.
• These factors greatly influence plant growth.