The outer bark, which is mostly dead tissue, is the product of the cork cambium (phellogen).

Cells of cork are dead, compactly arranged and have no intercellular spaces. It forms bark of the tree, which is several layers thick. A Chemical called Suberin is present in their walls. Suberin makes it impervious to gases and water.

Answer: The characteristics of cork are as follows:

• Cells of cork are dead at maturity.
• These cells are compactly arranged.
• Cells do not posses intercellular spaces.
• Cells possess a chemical substance ‘suberin’ in their walls.
• There are several thick layers.

phellem

Cork cambium (pl. cambia or cambiums) is a tissue found in many vascular plants as a part of the epidermis. It is one of the many layers of bark, between the cork and primary phloem. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems.

A leaf that has fallen off a tree is dead, which also means not alive. This must mean dead leaves are non-living things.

Some believe that as the leaves start to receive less sunlight, the health of the leaf will decline and it will become brittle and fall off. A good wind will easily knock off the colorful dying leaves. It is not so simple. The trees actually do this on purpose.

Leaves, on the other hand, are made up of cells containing DNA. This clearly indicates leaves initially are alive. They are fragile and thus easily damaged, necessitating regular replacement. There is no pain when they are lost, since they possess no pain sensors.

brown

autumn foliage

A dark, rich shade of orange is considered the color of fall and harvest (which we can probably thank pumpkins for). Yellow is most often associated with happiness. The color of the sun is used to evoke pleasant, cheerful and optimistic feelings.

Spiritually speaking, fall represents the Harvest time of year, a time to acknowledge growth and expansion as a natural evolution of being. Our lives go through cycles of growth, harvest, death, and rebirth just as we see in nature.

Leaves change color during the autumn because the amounts of pigments change as the leaves prepare to fall from the trees. This is the most common color of autumn leaves; about 70 % of shrubs and trees at the Harvard Forest produce anthocyanins during the senescence of the leaves.

Just like people, the trees in September begin to get ready for the coming winter. The trees which will spend the winter without their leaves, called deciduous trees, will soon begin turning color.

Coniferous trees are what you might generally refer to as pine or evergreen trees; they have thin, waxy needles instead of broad leaves. In stark contrast to they’re deciduous counterparts, conifers needles don’t change colors and aren’t shed annually, but only every few years.

9 Trees With Spectacular Fall Foliage

• ASPEN. Colorado’s favorite tree turns a brilliant gold as the weather cools.
• BLACK TUPELO.
• SUGAR MAPLE.
• CANADA RED CHOKE CHERRY.
• SASSAFRAS.
• BRADFORD PEAR.
• KATSURA TREE.
• AMERICAN BEECH.

TOP TREES FOR FALL COLOR

1. VINE MAPLE (Acer circinatum)
2. FRANKLIN TREE (Franklinia alatamaha)
3. WASHINGTON HAWTHORN (Crataegus phaenopyrum)
4. APPLE SERVICEBERRY (Amelanchier x grandiflora ‘Autumn Brilliance’)
5. RED OAK (Quercus rubra)
6. QUAKING ASPEN (Populus tremuloides)
7. DOGWOOD (Cornus florida)
8. SASSAFRAS (Sassafras albidum)