1. Factors Affecting Plant Growth
16.1

2. Soil Broken rock (erosion, etc) Humus Living organisms Air water
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

5. Factors affecting Growth
Growth regulators – ie. gibberellin, auxin, etc.
Nutrients
Sunlight
Water
acidity

6. 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.

7. Essential Nutrients of Plants:
Carbon dioxide
Land plants acquire from air.
Water plants from soil.
Water
From soil.
6 soil elements 

9. Thinking Lab, Page 585
#1 - #6.

10. 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?

11. 3) Water
What affect(s) would insufficient water supply have on a plant? Why?

12. Read the ‘Pause/Record’ on page 588. What do you think?

13. 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.

14. Homework
Page 591, #2, 4, 5, 6