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THE FLOWER. Packet #74 Chapters 30 & 38. THE PETALS. The Petals. Figure 30.7 Page 598. Petals are often brightly colored and of various shapes Aid in attracting pollinators Also considered sterile floral parts. Within the ring of petals are the fertile sporophytes, stamens and carpels.

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The flower

THE FLOWER

Packet #74

Chapters 30 & 38


The petals
THE PETALS

The Petals

Figure 30.7Page 598

  • Petals are often brightly colored and of various shapes

    • Aid in attracting pollinators

    • Also considered sterile floral parts.

  • Within the ring of petals are the fertile sporophytes, stamens and carpels.


Stamens
STAMENS

Stamens

Figure 30.7Page 598

  • The stamens are the male reproductive organs and is one of the fertile floral parts

  • Sporophytes produce the microspores that develop into male gametophytes.

  • Composed of a terminal sac called an anther where pollen is produced.

    • Anther is also supported by a stalk called a filament.


Carpel
CARPEL

Carpel

Figure 30.7Page 598

  • Carpels are the female reproductive organs and are the fertile floral parts

  • Sporophytes produce megaspores which develop into female gametophytes.

  • The tip of carpel is a sticky stigma that collects pollen

  • Style leads to the ovary at the base of the carpel

  • Inside the ovary are ovules

    • Develop into seeds if fertilized


Adaptations in flowers over the years
ADAPTATIONS IN FLOWERS OVER THE YEARS

  • In certain flowers, one or more of the four floral whorls have been eliminated.

  • There are also a variety of flower shapes, sizes and colors which represent adaptations to pollinators.



Terminology
TERMINOLOGY

  • Complete flowers

    • Four floral whorls

  • Incomplete flowers

    • Lacking one or more of the four floral shorls

  • Bisexual flower

    • Have stamen and carpels

    • Known as perfect flowers but can be complete or incomplete

  • Unisexual flower

    • Imperfect flowers

    • Staminate flowers if only the male organs are present

    • Carpellate flowers if only the female organs are present


Terminology ii
TERMINOLOGY II

Cucumber Plant and Female Ginkgo Tree

  • Monoecious Plants

    • Plants have staminate and carpellate flowers on the same plant

      • Corn

      • Cucumber

  • Dioecious Plants

    • Plants have staminate and carpellate flowers on different plants

      • Ginkgos

      • Date palms



Review1
REVIEW

  • Students

    • List potential examination questions and/or here, and on following slides, based on the packet.


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