By Sherman Hollar
For plenty of people, crops usher in the switch of seasons, symbolize the promise of nourishment, or function lovely visible reminders of Earths usual attractiveness. As important parts of approximately each surroundings on this planet, crops play a basic ecological position within the lives of so much organisms for his or her software in foodstuff and garments creation, gas, defend, and a number of different actions. entire with photos and diagrams depicting the elements and development levels of crops, this quantity clarifies what defines a plant and introduces readers to the constructions of assorted crops in addition to their advanced roles inside our surroundings.
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Additional info for A Closer Look at Plant Classifications, Parts, and Uses (Introduction to Biology)
The epidermis is the outermost layer of cells on the plant body. It covers the leaves, stems, and roots, as well as the flower parts and seeds. In most plants the epidermis is only one cell-layer thick. The epidermal cells are closely packed. When viewed through a microscope, they resemble a stone pavement. The outer cell wall of the epidermis—the cuticle—is particularly thick. It contains a waxy chemical known as cutin. Because water does not easily move through the cuticle, this layer protects the plant from 39 A closer look At PlAnt clAssIfIcAtIons, PArts, And uses The epidermis of leaves and certain stems contain small openings called stomata, which allow gasses in and out.
Like those of tracheid cells, the cell walls of vessel members contain lignin. As vessel members mature, the cell wall at each end of the cell dissolves and the living part of the cell dies, leaving a continuous “pipe” through which water can move. Like xylem, phloem includes parenchyma and sclerenchyma cells. Phloem conducts food through the plant body. The type of cell primarily 42 PlAnt cells And tIssues responsible for transporting food through the plant body is the sieve cell. These are elongated cells joined together end to end to form a sieve tube.
In many other plants the cotyledons are relatively small, and the embryo is nourished by a tissue called endosperm. 62 C hapter 5 Uses of Plants H uman beings depend on plants. Directly or indirectly, plants provide food, clothing, fuel, shelter, and many other necessities of life. Humankind’s dependence on crops such as wheat and corn (maize) is obvious, but without grass and grain the livestock that provide people with food and other animal products could not survive either. Food The food that plants store for their own growth is also the food that humans and other organisms need to live.