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Plant Structures and Growth




 
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A series of free High School Biology Video Lessons.

Plant Structure
When looking at the structure of plants, we can classify the plant structure into two major regions: the stem and the roots. The plant stem is typically above ground and supports the plant leaves. The stem is comprised of the protective dermal tissue, the ground tissue and the bundled vascular tissue. Plants typically have one primary root and secondary root branches that contain thousands of root hairs. The roots have several important parts such as the epidermis, cortex, endodermis and vascular tissue.
Plant structure and parts
Plant Growth
Plants grow using things called meristems which are layers of cells capable of rapid cell division. There are two types of meristems: (1) the shoot apical meristem where the plant grows taller and gives rise to new leaves or branches and (2) root apical meristems where the root grows longer. Plant growth can also be primary or secondary. Primary plant growth allows the plant to increase its length while secondary plant growth allows the plant to increase its girth.
Description and parts of plant growth



Plant Reproduction
Plant reproduction is the creation of new offspring through asexual or sexual reproduction. In plant reproduction, flowers attract pollinators. In flowers, the stamen are the male parts while the pistil or the female parts. A plant seed protects and feeds the plant embryo. The main parts of the seed are the seed coat which protects the seed, the endosperm which stores food, the cotyledon which is the seed leaf and the hypocotyl with is the seed stem.
Plant reproduction is the creation of new offspring through asexual or sexual reproduction.
Plant Adaptation
Plants have developed a number of adaptive mechanisms over time to aid in their reproduction and growth. Several things that plants have developed to aid in their adaptation include roots, vascular tissue, cuticles, seeds, flowers, fruits, cones, mutulalistic relationships and protective chemicals.
Plants have developed a number of adaptive mechanisms over time to aid in their reproduction and growth. This video describes the different parts of plant adaptation.


 
Plant Hormones
Plant hormones are chemicals that promote or inhibit growth in plants. There are 5 main types of plant hormones. Auxin, commonly abbreviated as IAA, gibberellins and cytokininins all promote plant growth. Abcisic acid and ethylene inhibit plant growth. These plant hormones are also produced synthetically and have many commercial uses


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