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Warm-Up Gymnosperms

Lesson Question

?

WK2 Words to Know

gymnosperm

ovule

sperm

egg

A. the reproductive cell of the male

B. the reproductive cell of the female

C. the reproductive structure of a seed plant that contains the egg cells

D. a seed plant whose seeds are exposed, rather than protected by fruits

Lesson Goals

Explore gymnosperms.

Recognize examples of gymnosperms.

Examine the life cycle of a gymnosperm.

Identify the

of gymnosperms.

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Warm-Up Gymnosperms

Vascular Plants

• Have vascular

• Xylem

•

• Develop true roots, stems, and

• May or may not have seeds

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GymnospermsInstruction

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Characteristics of Gymnosperms

A gymnosperm has seeds that are .

The leaves are or scale-like.

roots anchor them in the ground.

Types of Gymnosperms

Conifers Cycads Ginkgoes

• Conifers are the group of gymnosperms.

• Cycads live in tropical and subtropical .

• Ginkgoes are an species that lived during the time of the dinosaurs.

• Gnetophytes live in hot deserts and in tropical rain forests.

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GymnospermsInstruction

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Reproduction

Most gymnosperms produce cones, which are either male or female. Sometimes they grow on the same plant and sometimes they grow on different plants of the same species.

Male cones produce , which contain cells that develop into

.

Female cones produce ovules, which contain an .

• cones release pollen into the wind.

• The wind carries the pollen to the cones.

• Once fertilization occurs, the ovule develops into a .

Gymnosperm Life Cycle

• The cones release pollen into the air.

• carries the pollen to the female cones.

• The pollen gets stuck on the liquid produced by the ovule.

• Sperm from the pollen the egg in the ovule.

• The ovule then into a seed.

• The seeds are dispersed and grow into a new plant.

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Summary Gymnosperms

Answer

Review: Key Concepts

Characteristics

• Exposed seeds

• Needle-like or leaves

• Deep root system

Types

• Conifers

•

• Ginkgoes

• Gnetophytes

Lesson Question What are gymnosperms??

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Summary Gymnosperms

Review: Key Concepts

First, the male cone releases . Then the wind carries the pollen to

the female cones, where the pollen gets stuck on the female cones. Then the

sperm fertilizes the eggs in the .

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Summary Gymnosperms

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