Anonymous asked in Science & MathematicsBotany · 10 years ago

3 different plant life spans?

define the three different types of life spans AND their advantages and disadvantages

2 Answers

  • Anonymous
    10 years ago
    Best Answer

    Annuals live for one year (ex. corn, wheat, rice, and lettuce), biennials live for two years (ex. parsley, Lunaria, silverbeet, and Sweet William), and perennials live for three or more years (ex. banana, mint, agave, maple, and alfalfa).

    The benefit of an annual strategy may be genetic diversity, as one set of genes does continue year after year, but a new mix is produced each year. Secondly, being annual may allow the plants a better survival strategy, since the plant can put most of its accumulated energy and resources into seed production rather than saving some for the plant to overwinter, which would limit seed production.

    Conversely, the perennial strategy may sometimes be the more effective survival strategy, because the plant has a head start every spring with growing points, roots, and stored energy that have survived through the winter. In trees for example, the structure can be built on year after year so that the tree and root structure can become larger, stronger, and capable of producing more fruit and seed than the year before, out-competing other plants for light, water, nutrients, and space.

  • 3 years ago

    Kept properly, they usually live around 5 years, sometimes longer. Proper keeping involves at least a 5 gallon, filtered, heated, and cycled tank. With 25% of the water changed weekly. But in general, they don't live more than 1 year, maybe two if they're lucky. This is because people are under the impression that they can be kept in tiny bowls that aren't filtered or heated.

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