20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

The student is expected to:

7B analyze and evaluate scientific explanations concerning any data of sudden appearance,stasis, and sequential nature of groups in the fossil record;7D analyze and evaluate how the elements of natural selection, including inherited variation, the potential of a population to produce more offspring than can survive, and a finite supply ofenvironmental resources, result in differential reproductive success;

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

Continued:

8B categorize organisms using a hierarchical classification system based on similarities and differences shared among groups

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

KEY CONCEPT The largest phylum in the plant kingdom is the flowering plants.

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

Flowering plants have unique adaptations that allow them to dominate in today’s world. • Flowers allow for efficient pollination.

– animals feed on pollen or nectar – pollen is spread from plant to plant in process

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

• Fruit allows for efficient seed dispersal. – Fruit is flower’s ripened ovary– Surrounds and protects seed(s) – Many forms, each function in seed dispersal

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

Botanists classify flowering plants into two groups based on seed type. • A cotyledon is an embryonic “seed leaf.” • Monocots have a single seed leaf.

– leaf veins usually parallel– flower parts usually in multiples of 3 – bundles of vascular tissue scattered in stem

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

• Dicots have two seed leaves.

– leaf veins usually netlike – flower parts usually in multiples of 4 or 5 – bundles of vascular tissue in rings in stem

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

Flowering plants are also categorized by stem type and lifespan.• Stem type can be woody or herbaceous.

– Wood is a fibrousmaterial made up ofdead cells.

– Wood has highconcentrations oflignin and cellulose.

– Woody stemsare stiff.

Oak

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

Flowering plants are also categorized by stem type and lifespan.• Stem type can be woody or herbaceous.

– Wood is a fibrousmaterial made up ofdead cells.

– Wood has highconcentrations oflignin and cellulose.

– Woody stemsare stiff.

– Herbaceous plants do not produce wood.

Iris

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

• There are three types of plant life spans. – Annuals mature from seed,

flower, and die in one year.

Wheat

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

– Biennials take two years to compete life cycle.

• There are three types of plant life spans. – Annuals mature from seed,

flower, and die in one year.

Foxglove

20.3 Diversity of Flowering Plants TEKS 7B, 7D, 8B

– Annuals mature from seed, flower, and die in one year.• There are three types of plant life spans.

– Perennials live more than two years.

Big bluestem

– Biennials take two years to compete life cycle.