Phylum Gymnospermae The Gymnosperms, or Plants with Cones - - PowerPoint PPT Presentation

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Jun 07, 2023 545 likes •795 views

Phylum Gymnospermae The Gymnosperms, or Plants with Cones Gymnosperms Have seeds, but not covered by fruit All are perennials trees or shrubs Have windborne pollen (male gamete) Gymnosperms Three major types: Cycads

SLIDE 1

Phylum Gymnospermae

The Gymnosperms, or Plants with Cones

SLIDE 2

Gymnosperms

 Have seeds, but not covered by fruit  All are perennials – trees or shrubs  Have windborne pollen (male gamete)

SLIDE 3

Gymnosperms

 Three major types:  Cycads  Ginkgos  Conifers (most common type)

SLIDE 4

Cycads

 Ancient group  Today, found only in tropics

(warmer climate required)

 Resemble very short palms, but have tough,

leathery leaves

 Central area produces seeds

SLIDE 5

Cycads

SLIDE 6

Cycads – locations in world

SLIDE 7

Cycads

 Tropical plants

SLIDE 8

Cycads

 Plants are dioecious ( separate male and

female plants)

 Diagram of  Male cones

SLIDE 9

Cycads

 Cones are in central area

SLIDE 10

Gingkos

 Trees, dioecious, endemic to China  Often used in urban areas, tolerant to smog

SLIDE 11

Gingkos

 Have characteristic, fan-shaped leaves, with

vertical slit in centre, and parallel veins

SLIDE 12

Gingkos

 Only one species remaining from this group,

called Gingko biloba

SLIDE 13

Gingkos

 Tree – with very separate branch

appearance (not bushy)

SLIDE 14

Gingkos

SLIDE 15

Conifers

 Produce seeds in cones  Most important source of wood  Found in temperate to tropic regions

SLIDE 16

Conifers

 Forests:  Boreal /Taiga of

northern Canada

SLIDE 17

Conifers

SLIDE 18

Conifers

 Small leaves – needles or scales

SLIDE 19

Conifers

 No flowers, gamete produced in cones  Male cone

Female cone

SLIDE 20

Conifers

 Female cones are often woody and long-

lasting

SLIDE 21

Conifers

 Can withstand cold, snow (boreal forests of

northern Canada, Eurasia)

SLIDE 22

Conifers

 Also grow in the tropics – eg. the Caribbean!

Pinus caribea

SLIDE 23

Phylum Gymnospermae

The Gymnosperms, or Plants with Cones

Gymnosperms

 Have seeds, but not covered by fruit  All are perennials – trees or shrubs  Have windborne pollen (male gamete)

Gymnosperms

 Three major types:  Cycads  Ginkgos  Conifers (most common type)

Cycads

 Ancient group  Today, found only in tropics

(warmer climate required)

 Resemble very short palms, but have tough,

leathery leaves

 Central area produces seeds

Cycads

Cycads – locations in world

Cycads

 Tropical plants

Cycads

 Plants are dioecious ( separate male and

female plants)

 Diagram of  Male cones

Cycads

 Cones are in central area

Gingkos

 Trees, dioecious, endemic to China  Often used in urban areas, tolerant to smog

Gingkos

 Have characteristic, fan-shaped leaves, with

vertical slit in centre, and parallel veins

Gingkos

 Only one species remaining from this group,

called Gingko biloba

Gingkos

 Tree – with very separate branch

appearance (not bushy)

Gingkos

Conifers

 Produce seeds in cones  Most important source of wood  Found in temperate to tropic regions

Conifers

 Forests:  Boreal /Taiga of

northern Canada

Conifers

Conifers

 Small leaves – needles or scales

Conifers

 No flowers, gamete produced in cones  Male cone

Female cone

Conifers

 Female cones are often woody and long-

lasting

Conifers

 Can withstand cold, snow (boreal forests of

northern Canada, Eurasia)

Conifers

 Also grow in the tropics – eg. the Caribbean!

Pinus caribea

Gymnosperms - summary

 Old plant group  Better adapted to life on land than mosses or

ferns

 Windborne pollen (contains male gamete)  Have seeds (not enclosed in fruit)  Have no flowers