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How can you identify a tree by its leaves?

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How many plant species surround us? Have you ever asked yourself a similar question? Thanks to plants, life on Earth became possible; they provide us with food, warmth, and oxygen. Let’s try to remember something about the plant world from what we studied in high school and answer the question posed at the beginning.

The Earth’s plant life is vast and diverse, consisting of approximately 350 species, although some botanists estimate this figure to rise to 000 species. The plant kingdom includes purple algae and higher plants, which are divided into higher spore and seed plants. Seed plants, in turn, are divided into gymnosperms – these are usually evergreen coniferous trees and shrubs – and angiosperms, or flowering plants. Among the latter, herbaceous and woody species are distinguished. Woody species, or trees and shrubs, will be discussed in this book, which is designed to teach you how to navigate this huge world, sometimes just one leaf at a time.

According to satellite images, in 2015 there were about three trillion trees on our planet, of which approximately 640 billion were in Russia. But every year, due to climate change and deforestation, their number is decreasing.

What is a tree? A tree is considered to be a large plant with a perennial woody stem, called a trunk, which grows in height at its apex. The height of a tree changes throughout its life. At first, the tree grows quite quickly, but gradually slows down over the years. The height of different species ranges from several meters to many tens, reaching in some cases up to 120 meters or more for such giants as sequoia, which grows on the California coast of North America, and Australian eucalyptus trees. The growth of a tree continues throughout its life and in thickness, as a result of which the so-called annual rings are formed annually, by which the age of most species can be calculated. The lifespan of trees also varies greatly. Species such as sequoia and baobab can live up to 4–5 thousand years.

It should be noted that all trees and shrubs belong to higher seed plants, which scientists divide into two groups: gymnosperms and angiosperms. Gymnosperms have neither an ovary, nor, therefore, a fruit. The seed scales form a female cone with seeds. Angiosperm species have an ovary as a container for seeds, which, when ripe, forms a fruit.

Based on the type of leaves, all trees can be divided into coniferous and deciduous. Conifers (gymnosperms) are characterized by hard, evergreen, needle-shaped or scaly leaves called needles or needles, and the presence of cones. They grow in the temperate zone because they love a moderately warm climate and sufficient moisture. Their sizes range from dwarf to giant. This group includes, for example, pine trees, spruce trees, fir trees, larches, cypress trees, and sequoias. The oldest and tallest trees are coniferous plants. Thus, the intermountain bristlecone pine Methuselah, 4849 years old, was discovered by botanist Edmund Shulman. The tree was planted in 2831 BC. And the tallest tree, the Californian sequoia Hyperion, reached a height of 115 meters with a trunk diameter of 4,84 meters. Its age is only some 700–800 years.

Broad-leaved trees (angiosperms, or flowering trees) have broad, flat leaves, as well as flowers and fruits. This group includes maple, beech, ash, elm, linden, poplar and many others. These same trees can be divided according to their lifespan

Tasks on the surrounding world for 1st grade 1. How do the leaves of different trees differ? 2. How can you identify trees by their leaves? 3. What trees grow near your school?

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lady v [643K] 5 years ago

Each tree has its own unique shape and size of leaves. No two trees of different species will have exactly the same leaves. Therefore, by the leaves it is quite easy to determine which species a particular tree should be classified as.

When comparing the leaves of different trees, we must first of all pay attention to their shape, size and color. There are many other distinctive features of tree leaves, but we will cover them in high school. For grade 1, it is important to be able to distinguish the shape and size of leaves of the main types of trees.

To determine the name of a tree from its leaves, you should be able to use an identification atlas, which indicates which tree these or those leaves belong to. Gradually, you should remember which trees these or those leaves belong to. For example, near the school you can often find trees such as birch, poplar, maple, and rowan.

Each of these trees has its own unique leaf shape.

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Leopo ice2 [58.1K] 2 years ago

All deciduous trees have leaves. except for conifers, which have needles. Many people know such trees as: maple, birch, chestnut, oak, linden, elm, apple, aspen, cherry, willow, rowan. All these trees have leaves. By the leaves you can determine what kind of tree grows. Let’s look at the drawing.

The top left is an oak leaf, the top right is an oak leaf, and in the center is a maple leaf.

Bottom, left – poplar and right – aspen.

To identify a tree by its foliage, you should know the characteristics of the leaves, and you also need to pay attention to the number of leaf blades and the edges of the leaf blades, petiole, shape, size.

For example, an aspen leaf has a flattened, thin and long petiole. Therefore, if a slight wind blows, the leaves begin to tremble. This is where the saying “Trembles like an aspen leaf” comes from.

Leaves are divided into simple and compound.

Simple leaves. These are those that have one leaf blade on the petiole. For example: birch, oak, maple, aspen, poplar, bird cherry, willow, linden and so on.

Leaves are called compound if there are several leaf blades on the petiole.

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Evil Owl [62.2K] 6 years ago

Sheet – one of the most important parts of the plant body. It has a very important role for the plant – the production (formation/synthesis) of organic substances from inorganic ones. That is, “cooking food” for the plant.

But plants (for example, trees) grow in different conditions, and the structural features of their leaves are associated with these conditions.

There are several characteristics by which leaves differ, and knowledge of the characteristics of which allows one to identify plants.

К so leaf characteristics include:

  1. Leaf blade shape;
  2. absence or presence of petiole on the leaf;
  3. leaf edge shape;
  4. one or more leaf blades form a leaf;
  5. how the leaves are arranged (grow) on the stem of the plant.

The color, size of the sheet, whether it is smooth or rough also matters. But these are minor features.

Trees are identified by leaf using an atlas-identifier, in which you can find all the signs that are characteristic of the leaf of a particular plant. Sometimes your own knowledge about tree leaves is enough, but for an accurate determination you need special determinants. The sheet is examined and compared on all grounds (see above) with the information in the determinant. If all the characteristics of the leaf coincide with the characteristics in the determinant, then you can read the name of the plant indicated in the same atlas-determinant.

Near school often grow: birch, maple, poplar, aspen, horse chestnut, linden, elm.

The leaves of each tree are special, for example (incomplete botanical definitions are given):

  1. maple – a large leaf, on a long stalk, the veins diverge in wide rays from the base of the petiole (from one point), the edges of the leaf have sharp large teeth, there is only one leaf blade, the shape of the leaf resembles an outstretched human hand.
  2. Linden is a medium-sized leaf, the petiole is short, the edge of the leaf has a small saw-like tooth, the leaf is heart-shaped, and has a sticky layer on top.
  3. Horse chestnut is a very large leaf, on a long petiole, consisting of 5-7 elongated oval leaf blades, which are attached at one point at the base of the petiole. The edges of the leaf are jagged.

Examples of tree leavesgrowing near the school:

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