Where is the difference between grass and trees? A detailed explanation of the differences between herbaceous and woody plants

The plants in nature are diverse, composing the rich and colorful world in our eyes. Among them, the species of trees and grasses are undoubtedly the most numerous among plants. Whether in desolate deserts or the boundless ocean, there will be more or less the existence of trees and grasses, so where exactly is the specific difference between trees and grasses?

1. The difference between grasses and trees

In botany, grass is the collective term for herbaceous plants among higher plants other than cultivated plants, while tree refers to the general term for woody plants. The biggest difference between the two lies in the different structure of the stem. The xylem of the stem of herbaceous plants is less developed, while the xylem of the stem of woody plants is developed, and most cell walls are lignified. In the vascular bundles of herbaceous plants, the xylem is distributed on the outer side and the phloem is distributed on the inner side, while in woody plants it is exactly the opposite. The vascular bundles of herbaceous plants do not have a cambium, so they cannot continue to grow and thicken, while the vascular bundles of woody plants have a cambium, and the stem can grow thicker and thicker.

In daily life, the most direct distinction between trees and grasses is that trees are generally much taller than grasses. Although some herbaceous plants can grow to the height of trees, the species of such plants are very rare. In addition, the lifespan of trees is much longer than that of herbaceous plants. Herbaceous plants are mostly annual or biennial, while the lifespan of trees can reach up to thousands of years. The most ancient cedar trees growing on the narrow coast of northern California and southwestern Oregon in the United States have already lived for more than 5,000 years.

2. The significance of grasses and trees to nature

Grasses and trees both belong to a type of plant in nature, and both are of great significance to human survival. Many plants have high ornamental value and are excellent choices for beautifying the environment; plant leaves can carry out photosynthesis, absorb carbon dioxide from the air, and release oxygen, making the air fresh; plants can also effectively block noise. Plant root systems can effectively fix the soil and prevent soil erosion; in addition, plants provide humans with oxygen/food/medicinal materials. It can be said that human survival and reproduction cannot be separated from these plants.

That is all for our discussion of the distinction between grasses and trees. More related knowledge still needs to be obtained from books.