BELLWORK
Write the definition of new vocabulary.
Chapter 9: PlantsSection 1: An overview of plantsPages: 240-245Time: 7 minutes
Homework package due date is
Chapter 9: PlantsSection 1: An overview of plantsPages: 240-245Time: 7 minutes
Homework package due date is
OBJECTIVES
Students will learn
What is a plant?
•Between 260,000 and 300,000 plant species have been discovered and identified.
•Plants are important food sources to humans and other consumers.
•Without plants, most life on Earth as we know it would not be possible.
Plant Characteristics
•Plants range in size from microscopic water fern to giant sequoia trees that are sometimes more than 100 m in height.
•Most have roots or rootlike structures.
•Plants are adapted to nearly every environment on Earth.
•All plants need water. (freshwater/salt water)
Plant Cells
•A plant cell has a cell membrane, a nucleus, and other cellular structures.
•In addition, plant cells have cell walls that provide structure and protection.
•Many plant cells contain the green pigment chlorophyll (KLOR uh fihl) so most plants are green.
•Chlorophyll is found in a cell structure called a chloroplast.
Origin and Evolution of Plants
•Scientist think that plants ancestors were probably ancient green algae that lived in the sea
•Scientist think that plants ancestors were probably ancient green algae that lived in the sea
Life on Land
•Life on land has some advantages for plants more sunlight and carbon dioxide—needed for photosynthesis—are available on land than in water.
•During photosynthesis, plants give off oxygen.
•Life on land has some advantages for plants more sunlight and carbon dioxide—needed for photosynthesis—are available on land than in water.
•During photosynthesis, plants give off oxygen.
Adaptations to Land-Protection and support
•Covering the stems, leaves, and flowers of many plants is a cuticle (KYEW tih kul)—a waxy, protective layer secreted by cells onto the surface of the plant.
•The cuticle slows the loss of water.
•Cell walls contain cellulose (SEL yuh lohs), which is a chemical compound that plants can make out of sugar.
•Long chains of cellulose molecules form tangled fibers in plant cell walls. These fibers provide structure and support.
•Covering the stems, leaves, and flowers of many plants is a cuticle (KYEW tih kul)—a waxy, protective layer secreted by cells onto the surface of the plant.
•The cuticle slows the loss of water.
•Cell walls contain cellulose (SEL yuh lohs), which is a chemical compound that plants can make out of sugar.
•Long chains of cellulose molecules form tangled fibers in plant cell walls. These fibers provide structure and support.
Reproduction
•The presence of water -resistant spores helped some plants reproduce successfully
•other plants adapted by producing water- resistant seeds in cones or in flowers that developed into fruits.
•The presence of water -resistant spores helped some plants reproduce successfully
•other plants adapted by producing water- resistant seeds in cones or in flowers that developed into fruits.
Classification of Plants
•The plant kingdom is classified into major groups called divisions.
•Vascular (VAS kyuh lur)
or
• non vascular plants
•Vascular plants have tubelike structures that carry water, nutrients, and other substances throughout the plant.
•Nonvascular plants do not have these tubelike structures and use other ways to move water and substances.
• non vascular plants
•Vascular plants have tubelike structures that carry water, nutrients, and other substances throughout the plant.
•Nonvascular plants do not have these tubelike structures and use other ways to move water and substances.
Naming Plants
•In the third century B.C., most plants were grouped by leaf characteristics.
•This simple system survived until late in the eighteenth century.
•Carolus Linnaeus, developed a new system.
•His new system used many characteristics to classify a plant.
•He also developed a way to name plants called binomial nomenclature (bi NOH mee ul · NOH mun klay chur).
homework package is on coolsis.
•In the third century B.C., most plants were grouped by leaf characteristics.
•This simple system survived until late in the eighteenth century.
•Carolus Linnaeus, developed a new system.
•His new system used many characteristics to classify a plant.
•He also developed a way to name plants called binomial nomenclature (bi NOH mee ul · NOH mun klay chur).
homework package is on coolsis.
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