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Factors Affecting Plant Growth. 16.1. Soil. Broken rock (erosion, etc) Humus Decomposing organic matter. acts to bind mineral particles together and retain water and atmospheric gases. Provides some nutrients for plants. Living organisms Plants, ,animals, fungi, and micro-organisms. - PowerPoint PPT Presentation
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Factors Affecting Plant Growth
16.1
Soil– Broken rock (erosion, etc)– Humus
• Decomposing organic matter.– acts to bind mineral particles together and retain water and atmospheric
gases.– Provides some nutrients for plants.
– Living organisms• Plants, ,animals, fungi, and micro-organisms. • The total mass of organisms living in the soil is much greater than
the sum of mass of all organisms above ground.– Air
• Network of spaces created by roots and movement of animals such as earthworms.
– water
Factors affecting Growth
• Growth regulators – ie. gibberellin, auxin, etc.• Nutrients• Sunlight• Water• acidity
1) Nutrients
• Essential nutrient: materials that a living thing needs to make its own structures and obtain energy for survival.– Organism can not make them themselves. Ex/
humans need to injest vitamin C and glucose. Plants can make these, so they are not ‘essential’ for them.
• Essential Nutrients of Plants:– Carbon dioxide• Land plants acquire
from air.• Water plants from
soil.– Water• From soil.
– 6 soil elements
• Thinking Lab, Page 585– #1 - #6.
2) Sunlight
• Equation for Photosynthesis:
• What would happen to the production of glucose if there was limited sunlight?
• How would limited glucose levels affect a plant’s growth?
3) Water
• What affect(s) would insufficient water supply have on a plant? Why?
• Read the ‘Pause/Record’ on page 588. What do you think?
Section Expectations
• Understand the role of each of the following in terms of plant growth and survival– Essential minerals/soil– Animals in soil– Water– Carbon dioxide
• Understand the four nutrient cycles.
Homework
Page 591, #2, 4, 5, 6