Plant Parts and Functions

Most  plants  have  five  main  parts:  leaves,  stems,  roots, flowers, and fruit.  http://www.agrinfobank.com
Leaves. http://www.agrinfobank.com

Leaves make sugars by a process called photosynthesis (photo = light, synthesis = putting together). This process  takes  place  in  green  structures  within  the  leaves called  chloroplasts.  Chloroplasts  give  plants  their  green color.  No  sugars  can  be  made  in  the  chloroplasts  unless water, carbon dioxide, and light are all present. Leaves are arranged on the plant to "catch" as much light as possible.  Leaves have tiny pores, called stomata, which let in car -bon dioxide from the air. As the carbon di ox ide comes in, water (in the form of a gas) escapes. This escape of water from  the  plant  is  called  transpiration. The  plant  can  slow down the loss of water by closing its stomata.

Flowers.

Flowers are often pretty, but their main purpose is to produce seed. Their colors and markings are designed to attract in sects. The ovule will be come a seed when it is fertilized by pollen. Some flowers can be fertilized by their own pollen (self-pollinating). Others require pollen from different  flowers  (cross-pollinating).  Insects  are  often  the agents for transferring pollen from one flower to an other. agrinfobank.com

Some plants have different types of flowers on the same plant.  For  example,  a  cucumber  plant  has  male  flowers (flowers with no female parts) and female (flowers with no male parts). Such plants are called monoecious. agrinfobank.com

Other plants are called dioecious be cause each plant will have only one type of flower. A male plant will pro duce only male flowers, and a female plant will produce only female flowers.  An  example  of  a  dioecious  plant  is  holly.  Male plants  will  not  have  red  berries,  and  neither  will  female plants  un less  male  plants  are  nearby  to  pollinate  their  flowers.
Fruits. http://www.agrinfobank.com
Fruits can take many forms and shapes, but they have only one common purpose. They are de signed to scatter the seed inside them. http://www.agrinfobank.com

Stem. http://www.agrinfobank.com
The stem sup ports the leaves so that they are in the light. It sup ports the flowers and fruits in a position to ensure pollination  and  seed  dispersal. The  stem  also  contains  the transportation system. Sugars move from the leaves to the roots through the stem, and at the same time water and nutrients move from the roots to other parts of the plant.
Roots.http://www.agrinfobank.com
Roots  are  tiny,  branching  string-like  structures that grow down into the soil, taking up water and nutrients. They  also  steady  the  plant  so  it  can  position  its  leaves  to catch light. http://www.agrinfobank.com

Seed.  http://www.agrinfobank.comhttp://www.agrinfobank.com
Many plants begin life as a seed. When conditions are  right,  the  seed  will  germinate  and  be come  a  seedling. Young plants have only leaves, roots, and a stem.
A plant is considered an adult when it flowers. When it forms seeds, the life cycle is complete. Many plants die immediately after forming seeds.