The Three Parts of a Plant

Some botanists refer to the three main parts of a plant as the roots, the stem and the fruit. This view can be expanded to include the leaves as a distinct and separate feature.

Roots

Strong roots are needed if a plant is to be healthy. Roots anchor the plant, absorb food and water from the soil, and store up food for times of scarcity. Roots have four main parts: the primary root, secondary roots, root hairs and root caps at the growing tips of roots. Roots need sufficient room to grow in order to do their work.

Stem

Stems may be hard and sturdy like the trunk of a tree, or slender and fragile as in a delicate flower, but the functions are the same. Stems maintain the plant's structure and transport water and food. Stems also have four parts: the main stem, the secondary stems, nodules, which are small bumps where leaves will grow, and internodules, the spaces between nodules.

Fruit or Flower

Fruits and flowers are two distinct parts of the plant. The fruit may or may not develop from the flower. It is the part of the plant which covers and protects the seed. Flowers are the parts of the plant that attracts pollinators which assist in plant reproduction. Birds, insects or bats can serve as pollinators. Flowers have both male and female reproductive organs. The androecium is the male portion which produces the pollen, and the gynoecium is the female part. Within the gynoecium are the stigma, which picks up the pollen, and the style, a tube the pollen passes through to reach the ovary, which is where fertilization takes place.

Leaves

Leaves are vital organs of photosynthesis, the process by which plants transform light into energy which is stored as sugar. Leaves have two main parts, the blade and the petiole. The blade is the part we usually think of as the leaf. Within the blade of the leaf are the veins, which carry food from the stem to the leaf and the margin, the outer part of the leaf. The petiole connects the blade to the stem.

Plant Power

The basis of the food chain, plants are necessary to all other forms of life on earth. They provide us with food, medicine, and many items we use every day, from wood furniture to rubber for tires to cotton for clothing. They also moderate Earth's temperature and, through photosynthesis, provide oxygen for us to breathe. We simply could not exist without plants, as they are an integral part of our ecosystem.

References

• Parts of a Plant