Download A Closer Look at Plant Classifications, Parts, and Uses by Sherman Hollar PDF

By Sherman Hollar

For lots of folks, vegetation bring in the switch of seasons, symbolize the promise of nourishment, or function gorgeous visible reminders of Earths usual good looks. As important elements of approximately each surroundings on this planet, crops play a basic ecological function within the lives of such a lot organisms for his or her application in meals and garments creation, gas, look after, and a bunch of different actions. entire with photographs and diagrams depicting the components and progress levels of vegetation, this quantity clarifies what defines a plant and introduces readers to the buildings of assorted crops in addition to their complicated roles inside of the environment.

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The flowers are where the seeds that will give rise to new plants are produced. The primary parts of the flower are the sepals, petals, stamens, and pistil. The leaflike sepals form the protective covering for the flower bud before it opens. All of the petals together are called the corolla. The petals are often brightly colored to attract insects or other animals that might pollinate the flower. Some flowers have glands at the base of the petals or sepals that produce nectar—an additional attraction to pollinators.

The stems of such plants may also have curly tendrils—modified branches that cling to a tree or other support. In tropical forests there are many kinds of woody lianas that climb up the trunks of trees into the sunlight. The stems of herbs have scarcely any woody tissue. The banana tree is not a tree at all but an herb because its trunk, or stem, is not woody. There are several kinds of herbaceous stems. Most of the familiar flowers have upright stems. The stems of cucumber and pumpkin plants lie prostrate on the ground.

When the buds begin to swell in the spring, the bud scales fall off, leaving scars. The amount of annual growth of a plant can be measured by the distance between these scars. Active buds are those that are growing and producing new plant parts. Most buds are latent—that is, they do not grow unless the plant suffers injury, as from fire, insects, or frost. Latent buds lie in reserve and are stimulated to growth only when necessary to restore the plant to good health. Monocot stems have a cortex and vascular bundles with xylem and phloem.

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