By Brian Capon
A transparent, nontechnical clarification of ways crops paintings, and our bestselling e-book. It succeeds in explaining the complicated techniques of plant progress, features, version, responses, and replica in easy language. because the writer meant, the gardener can come to appreciate a plant "from the plant's element of view."
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Extra info for Botany for Gardeners: An Introduction and Guide
Southwest, a group of plants is classified under the name "chaparral". These are low-growing shrubs bearing small, leathery leaves, rich in highly flammable resins. Their leaf litter and dry branches make perfect tinder for fast-moving fires, especially on the steep slopes where chaparral normally grows. Seeds from these plants survive the fires with nothing more than a scorching, but sufficient to ready them for water uptake during subsequent rains. The above-ground parts of parent plants are reduced to ash that recycles nutrients back to the soil; nutrients that have been uselessly locked in dead branches for years.
Each time a cell divides, two complete cells are produced. Every cell in a plant, with the exception of the original fertilized egg, has had its origin in this process. The most important part of cell division is providing each new cell with a nucleus containing a complete set of genes. This is accomplished during a process called mitosis (Greek: mitos, thread) in which the nuclear DNA becomes organized into sets of threadlike structures called chromosomes. ) The chromosomes go through an elaborate "dance" sequence, culminating in matched chromosome parts being segregated into the two newly developed cells.
If every seed in a population germinated at the same time, the risk of having all seedlings perish in a late frost or unseasonal drought is increased. While a seed is the stage in a plant's life cycle most resistant to environmental extremes, the seedling is most vulnerable. The system of staggered germination maintains an emergency supply of viable seeds in the soil at all times and is achieved by members of a seed population having different rates of after-ripening or variable rates of scarification due to different seed coat thicknesses.