How are tree rings formed?

Answer 1

Tree rings are fomed each growing season. Just under the bark of the tree you will find what is known as the cambium. This is the living part of the tree which on it's inner side has what is known as the xylem (uptakes water and nutrients from the root system), and the phloem (responsible for transporting the food made in the leaves back in to the tree). This cambium layer is responsible for the width growth of the tree. As the cambium divides and multiplies it's cells, the width of the tree increases. At the end of the growing season in deciduous trees (leaf shedders), the cambium slows it's services down, this in turn means all the nutrients are transported along a narrow passage (due to cell reproduction slowing down). This will leave a narrow stain giving us a ring. The following spring when the cambium re-juvinates the cells multiply rapidly and the wood appears less stained as the expansion of new wood happens quicker. Dependant on the species of tree, sunlight and rainfall and the growing conditions, the width of the rings will be determined. I could get alot more scientific but I have tried to give a simple explanation.

Answer 2

EASY EXPLANATION Trees form rings (also known as annual growth rings) because in temperate regions the vascular cambium, a type of lateral meristem that causes growth of secondary xylem, becomes dormant during the winter and later resumes growth in the spring. Because the cells are much smaller right before dormancy compared to the large cells right after dormancy, there is a clear difference, or ring, that is visible. This process occurs periodically every winter (every year), resulting in annual growth rings.

SLIGHTLY LESS EASY EXPLANATION

Vascular tissues of plants are of two types

1. Xylem

2. Phloem

And these 2 tissues are again of 2 types

1. Primary

2. Secondary

The primary vascular tissues are present in all vascular plants and are formed from a primary meristem called PROCAMBIUM . The secondary vascular tissues are found only in dicot plants because they develop from a special kind of meristem ( lateral ) called VASCULAR CAMBIUM which is seen only in dicots. The production of secondary vascular tissues is called SECONDARY GROWTH.

The vascular cambium produces secondary xylem to its inner side and secondary phloem to its outer side.

During spring, there is more activity in the plant due to the formation of new leaves, etc, hence the increased need for more water supply and thus more secondary xylem with large lumen is produced. This wood appears light in colour and is called EARLY WOOD or SPRING WOOD.

During autumn all the leaves fall off and there is not much need of xylem and hence the activity of vascular cambium decreases and less xylem with narrow lumen are produced. This wood appears dark and is called LATE WOOD or AUTUMN WOOD.

Thus every year two types of wood are formed which appear as a ring called ANNUAL RING or GROWTH RING.

Answer 3

Hi there growth are formed over hundreds of years they indicate a growth stage in a tree the more growth rings the older the tree, only slow growing trees have beautiful growth rings such as oak trees, so the rings are formed when the trees have a growth period han stop this is when the defined ring is made

Answer 4

Tree rings are fomed each growing season. Just under the bark of the tree you will find what is known as the cambium. This is the living part of the tree which on it's inner side has what is known as the xylem (uptakes water and nutrients from the root system), and the phloem (responsible for transporting the food made in the leaves back in to the tree).

This cambium layer is responsible for the width growth of the tree. As the cambium divides and multiplies it's cells, the width of the tree increases. At the end of the growing season in deciduous trees (leaf shedders), the cambium slows it's services down, this in turn means all the nutrients are transported along a narrow passage (due to cell reproduction slowing down). This will leave a narrow stain giving us a ring. The following spring when the cambium re-juvinates the cells multiply rapidly and the wood appears less stained as the expansion of new wood happens quicker.

Dependant on the species of tree, sunlight and rainfall and the growing conditions, the width of the rings will be determined.

Answer 5

Every year the bark of a tree gains a new layer of bark that grows on top of the older bark. When cut down you can see how many layers have grown over the years. When you count these you can tell how old the tree is.

Answer 6

The rings in a tree trunk are referred to as secondary growth. This is when the tree grows outward, rather than upward. The rings form once a year.

Answer 7

every year a tree rows a new layer of bark hiding the last layer in it to make the rings

Answer 8

The rings are formed each year as the tree grows.