Life Cycle of a Plant

Life Cycle of a Plant

Everything that lives on earth has a life cycle.  Life has a beginning point, growth, reproduction, and an end of life. All plants have a life cycle and this cycle is very important to agriculture.  Because a major source of our food is from plants, we can classify them by their life cycle.  Crops can be sorted into annuals, biennials and perennials.  But before we look into the classification of some agricultural crops, let’s first take a look at the plant life cycle.

Where it all Begins

Plants start their lives as tiny 种子.  Seeds contain a plant with 叶子, stem and roots.  The first step a seed takes on its path is 发芽.  发芽 is when the plant within the seed begins to grow with the help of water, soil and sun.  As the process continues, the plant develops stems and roots. 茎 push up toward the light.  根 grow down into the soil. 现在, 叶子 开始成长.  叶子 unfold, take in sunlight and produce food through photosynthesis.  The plant then begins to develop 花.  Many plants produce 花 that are important in making 种子.  The 花 are then 授粉.  Flowers are 授粉 when pollen from the stamen moves onto the pistil.  Seeds and fruit are produced.

Agriculture and the Plant Life Cycle

Plants that are grown for our food and fiber can be classified by their life cycle.  This refers to how long it takes the plant to complete its life cycle.  Plants can be classified as annuals, biennials and perennials.

一年生植物, Annuals are plants with a life cycle that lasts one year.  Most annual plants are planted as 种子 in the spring, bloom in the summer and then die off in the fall.  Annuals will not grow the next year unless they are replanted as 种子 the following spring.

双年展, Biennials are plants with life cycles that take two years to complete.  A biennial will be planted in the spring and will grow its roots, stem and 叶子 during the first year.  The plant will then lay vegetative in the summer and dormant in the fall and winter.  It will flower the second summer, and produce 种子 before dying off during the fall season of its second year. Biennials require the period of being dormant, which is caused by cold temperatures. 

多年生植物, Perennials are plants with a life cycle that lasts more than two years.  The entire plant does not die off in the fall.  It will persist through the fall and winter seasons and will regrow from the same root system the following spring season.

Classification of Crops

A major source of our food is from plants.  Take a look at the classification of some of these plants based on their life cycle; Annuals, biennials and perennials.

The plant life cycle is important to agriculture.  A lot goes into the food we eat.  Farmers are plant cycle professionals, tending to their planting and growth, so we can enjoy the fruit or vegetable it produces.  Farmers know the life cycle of every plant they grow and harvest.  They understand when to plant the 种子, how long it will take to grow, and how best to nurture the crop during the life cycle. 

Download a PDF version of the infographic.

Sources:  Coolkidfacts.com, natgeokids.com, PennState Plant Life Cycles, The Fact Factor-Classification of Crops.