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tree

Primary Information
Secondary Information

Definition

A tree is a woody plant that has one main stem, called the trunk, that grows from the ground. The trunk branches off into smaller branches, which support the leaves. The leaves are where the tree makes food through photosynthesis.

Trees are classified into two main groups: evergreens and deciduous trees. Evergreen trees have leaves that stay on the tree all year round. Deciduous trees lose their leaves in the fall and grow new leaves in the spring.

Trees are important for the environment because they provide a number of benefits, including:

  • They produce oxygen, which we need to breathe.
  • They help to regulate the climate.
  • They provide food and shelter for animals.
  • They help to prevent soil erosion.
  • They beautify our surroundings.

How can the word be used?

The tree was covered in leaves, providing shade for the people below.

tree

Different forms of the word

Noun:

a tall plant with a single main stem that branches out at the top.

Verb:

to grow or form into a tree.

Etymology

The word "tree" comes from the Old English word "trēo", which also means "tree".

The first recorded use of the word "tree" in English was in the 8th century.

The word "tree" is an Old English word, and it is related to the Old Frisian word "trē", the Old Saxon word "trio", the Old Norse word "tré", and the Gothic word "trewa".

Question

What trees can you name?

AQA Science Exam Question and Answer

Question:

Explain the structure and functions of a tree in an ecosystem. Describe how different parts of a tree contribute to its overall survival and its role in maintaining ecological balance. Provide an example of a symbiotic relationship involving trees and another organism.

Answer:

A tree is a complex and essential component of an ecosystem, possessing various structural elements and functions. Its structure includes roots, stem, branches, leaves, and reproductive organs. Roots anchor the tree in the soil, absorb water and nutrients, and establish symbiotic relationships with fungi to enhance nutrient uptake. The stem supports the canopy and transports water and nutrients between roots and leaves.

Leaves are crucial for photosynthesis, using sunlight to convert carbon dioxide and water into glucose and oxygen. This process not only provides energy for the tree but also releases oxygen into the atmosphere. Trees play a vital role in maintaining ecological balance by regulating carbon dioxide levels, providing habitat and food for various organisms, and preventing soil erosion.

An example of a symbiotic relationship involving trees is mycorrhizal fungi. These fungi form partnerships with tree roots, extending the root system's reach and aiding in nutrient absorption. In return, the fungi receive sugars produced during photosynthesis. This mutualistic relationship benefits both organisms, enhancing the tree's nutrient uptake while assisting the fungi in acquiring energy.