Introduction Plants
10-20-09
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Introduction to Plants - Teaching Agriscience - Slides | AG ED 203, Study notes of History of Education
Material Type: Notes; Professor: Dobbins; Class: TEACHING AGRISCIENCE; Subject: AGRICULTURAL EDUCATION; University: Clemson University; Term: Fall 2009;
Typology: Study notes
Pre 2010
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Introduction Plants
What is a plant and why
are they important?
- (^) A plant is a living organism that has the capacity to make its own food through a process known as photosynthesis. Energy Flow SOLAR ENERGY SUN Food (Chemical energy for plant) Water from soil (moisture) Carbon dioxide from atmosphere
Plants are made of many cells.
- (^) Some plants, such as trees, grow quite large and live for many years.
- (^) Some plants are small and may live for only one year, with lettuce and petunias being examples.
Plants are used in many ways.
- (^) Food—Plants are used to produce human food and animal feed materials.
- (^) Clothing—Plant fibers are used to produce clothing.
- (^) Shelter—Plant materials, especially lumber and plywood, are used in building houses and other structures.
Vacuole
- (^) The is a large sac bound by a membrane.
- (^) It may occupy up to 90% of the cell.
- (^) The vacuole contains water, stored foods, salts, pigments, and wastes.
- (^) Found only in plants.
Cell wall
- (^) Made of multiple layers of cellulose.
- (^) Cellulose is a complex sugar molecule.
- (^) The cell wall thickens and becomes rigid, once cell stops growing.
Definition of Physiology
The study of HOW organs FUNCTION
and the complex CHEMICAL processes
that permit a plant to LIVE, GROW, and
REPRODUCE
© 2005 Thomson Delmar Learning. All rights reserved.
PHOTOSYNTHESIS
Solar energy is converted into chemical energy. CARBON DIOXIDE + WATER light energy and chlorophyll SUGAR + OXYGEN + WATER in the presence of is converted into C 6 H 12 O 6
- (^) 6O 2
- 6H 2 O CO 2 H 2
- O © 2005 Thomson Delmar Learning. All rights reserved.
Respiration
Take in oxygen; give off carbon dioxide.
SUGAR + OXYGEN
CARBON DIOXIDE + WATER + HEAT (energy) 6CO 2
C 6 H 12 O 6
+ 6O
2 6H 2 O is converted into © 2005 Thomson Delmar Learning. All rights reserved.
Soil
Soil offers the plant
- (^) Air.
- (^) Water.
- (^) Nutrients.
- (^) Support © 2005 Thomson Delmar Learning. All rights reserved.
Air
- (^) Air or atmosphere surrounding the parts of the plant above the ground.
- (^) Supplies the carbon dioxide and oxygen required by the plant. © 2005 Thomson Delmar Learning. All rights reserved.
Plant Nutrition
- (^) There are 16 ESSENTIAL nutrients.
- (^) These are needed in very large amounts, obtained from the atmosphere and water: - (^) carbon (C) - (^) hydrogen (H) - (^) oxygen (O)
- (^) Macronutrients are obtained from the soil:
- (^) nitrogen (N)
- (^) phosphorus (P)
- (^) potassium (K)
- (^) calcium (Ca)
- (^) magnesium (Mg)
- (^) sulfur (S) © 2005 Thomson Delmar Learning. All rights reserved.
Ions
Ions are atoms with an electrical charge.
- (^) Anions—negatively charged ions
- (^) Cations—positively charged ions
- (^) Elements such as nitrogen must have the correct electrical charge to be absorbed by the root of the plant. © 2005 Thomson Delmar Learning. All rights reserved.