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Plant Structure and Life Span
Transcript of Plant Structure and Life Span
(Non-Woody) Do not produce lignin or secondary tissues Woody Plants Aerial parts of plant persist at the end of the growing season Grow, reproduce, die in one year or less Herbaceous plants Annuals Stems and leaves of the plants (aerial parts) die back into the ground once finished growing California poppies
are a type of herbaceous
plant Produce hard, lignified secondary tissues Plants such as trees
that are composed
of wood are examples of woody
plants Bamboo is also
an example of a
woody plant Marigolds are an
flower The herb cilantro is also an annual-- it needs to be replanted every year Biennials Herbaceous plants Take two years to complete their life cycles before dying Produce extra carbohydrates during their first season and store them to use during their second season Foxglove is a
herbaceous biennial Perennials Can be herbaceous or woody plants, but all woody plants are perennials Have the potential to live for more than two years, but can live for hundreds even thousands of years Oxalis Triangularis are a special type of perennial that close their petals at night in response to the lack of light Temperate Climates Aerial stems of herbaceous perennial plants die back each winter Roots and underground stems become dormant* during the winter and send out new growth each spring *Dormancy is when an organism reduces its metabolic state to a minimum level to survive unfavorable conditions Example: asparagus Tropical Climates Aerial parts of herbaceous perennials may die
back and the underground parts become dormant during the unfavorable dry season OR Other herbaceous perennials, like orchids,
grow year round Woody Perennials Deciduous Evergreen Shed their leaves
before winter and
produce new stems
with new leaves in
spring Shed their leaves over
a long period, so some leaves are always present Most woody plants Can attain massive sizes Maple
Trees Evergreen Trees In Favorable Environments... Plants have to compete for available space Since space is so limited, plants that die are quickly replaced Perennials have an advantage here because they occupy their area for the longest and are able to spread their seeds Notice how tropical rainforests are dominated by woody perennials because this is a favorable environment In Unfavorable Environments... There is more space available for the plants to grow, so there is less competition Here, small, short-lived plants have the advantage because they can grow quickly when the conditions are most favorable In the desert after it rains, annuals dominate the area over perennials Watch the changes an oak tree goes through over the course of one year! It is a woody perennial (deciduous), so notice how it sheds its leaves and grows new ones, but does not die