Flowers Flashcards
Flower Organs
Flowers are the reproductive structures of anthophytes.
Flower Structures:
Flowers have several organs that provide protection or support, or are involved in the reproductive process.
There are basically four structures – Sepals, petals, stamen, and pistils.
Sepals
May be green and look like leaves and petals.
Petals
Attract animals pollinators and provide a landing pad.
Speals and Petals
open and close to protect the reproductive parts of the flower
Stamen
(most flowers), the male reproductive organ– surrounding the central part of the flower.
Filament Stalk
Supports the anther, which contains the pollen grains.
Complete Flowers
Flowers that have sepals, petals, statmens and one or more pistils.
Incomplete Flowers
If a flower is missing one or more of theses organs.
Perfect Flowers
Flowers that have both stamens and pistils.
Imperfect Flowers
Has either functional stamens or pistils.
Distinguishing flowers notes:
The number of flower organs distinguishes dicots and eudicots from monocots.
Monocots generally have multiples of three.
when THE PETAL NUMBER IS A MULTIPLE OF FOUR OR FIVE, THE PLANT IS EITHER A DICOT OR A EUDICOT.
the number of other organs often is the same multiple of three, four, or five.
Pollination Mechanisms
Flower addaptations that relate to pollination include flower size, shape, color, and petal arrangements.
Animal pollination
wind pollination
Self pollination
Photoperiodism
The flowering response to the number of hours of uninterrupted darkness is known as phototoperiodism.
Flowering plants are divided into four different groups based on the critical period.
Short Day Plant
Flowers when exposed daily to a number of hours of darkness that is greater than its critical period ( Pointsettias, pansies, tulips, and chrysanthemums).
