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24.2 Organs of Flowering Plants
The structure and function of roots, stems, and leaves are compared.
List and describe the features of monocots.
The earliest plants were simple and lacked true stems, roots, and leaves.
Organs developed to facilitate living in dry environments as plants gained vascular tissue and began moving away from water.
The chapter focuses on the organs commonly identified with the angiosperms, or flowering plants.
A flowering plant has a shoot system and root system.
The shoot system of a plant consists of the stem, branches, and leaves.
The leaves are exposed to as much sunlight as possible by the support of a stem.
The stem transports materials between the roots and leaves.
There is a bud located at the angle where a leaf joins a stem.
A occurs when a leaf or leaves are attached to a stem.
Water and minerals from the roots through the stem to the leaves and the products of photosynthesis are usually in the opposite direction.
There is simply the roots.
Primary growth is downward when the root tip contains apical meristem.
The root system and shoot system of a plant.
There are two types of plant vegetative organs in the shoot system.
The shoot system is connected to the root system by tissue that extends from the roots to the leaves.
During primary growth, a terminal bud contains apical meristem and produces new leaves.
The branches grow from the bud.
Section 27.3 will discuss flowers and fruit as reproductive organs.
Plants with only one cotyledon are referred to as monocotyledons.
Eudicots are plants with seeds that contain two cotyledons.
The cotyledons of monocots act as transfer tissue and the nutrients are derived from the endosperm before the true leaves begin photosynthesizing.
There are two types of flowers: monocots and Oreudicots.
The number of cotyledons, the arrangement of vascular tissue in roots, stems, and leaves, and the number of flower parts are some of the features shown here.
The transport tissue is organized differently in different parts of the body.
In the monocot root, there is a ring of blood vessels, while in the monocot stem there is a scattered ring of blood vessels.
The xylem and phloem are located between the points of the star in the eudicot root.
There are bundles in a ring in a eudicot stem.
There are veins in a leaf.
Monocot leaves have a smooth edge and parallel venation, while eudicot leaves have a smooth edge and parallel venation.
The leaf veins have a netlike pattern.
There are differences in the number of flower parts in adult monocots and Eudicot.
Eudicot's flower parts are arranged in multiples of four or five.
Eudicot pollen grains have three pores, while Monocot pollen grains have one.
The appearance of flowering plants in geologic time was helped by the characteristic of fossilized pollen.
Many aspects of the structure of monocots and Eudicots are affected by the distinctions between them.
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