There are two types of plants, monocots and dicots. Monocots have vascular bundles that are randomly distributed and dicots have their vascular bundles in an organized ring.
In young dicot and monocot stems do not increase in thickness. Xylem and phloem are arranged in vascular bundles in the cortex. In older stems and all woody stems, the vascular tissues form a cylinder between the cortex and the pith. The vascular bundles in a monocot are scattered throughout the stem.
bundles of collagenous fibers that pass into the outer circumferential lamellae of bone or the cementum of teeth.
The three layers of the wall are the outer fibrous coat, the middle vascular layer and the inner nervous layer.
the stem consists of the outer dermal tissues which has epidermis. also it has the vascular system, which is made up of xylems and pholoems. Xylems transports the liquids aroudn the plant while the pholoems transports all the food. there are different structures of the vascular tissues through out the plants. between the vascular tissues and the dermal tissues there is the ground tissue.
Vascular tissue
When xylem is surrounded by phloem from outer as well as inner sides, the vascular bundles are called amphivasal
In young dicot and monocot stems do not increase in thickness. Xylem and phloem are arranged in vascular bundles in the cortex. In older stems and all woody stems, the vascular tissues form a cylinder between the cortex and the pith. The vascular bundles in a monocot are scattered throughout the stem.
They form a ring where phloem forms an outer ring around the xylem.
In more complex diagrams they show that we have an outer core. actually we do have but not for any chemical properties but for the slight difference in temperature. It helps in forming the magnetic sphere around us.
bundles of collagenous fibers that pass into the outer circumferential lamellae of bone or the cementum of teeth.
A typical leaf has an outer (epidermal) layer, pores (stomato) surrounded by a pair of guard cells, middle tissue (mesophyll) where photosynthesis occurs and a vascular system that carries water and nutrients.
Generally speaking, monocots (such as palm) can not be grafted since the vascular cambium is distributed in discrete bundles throughout the stem instead of on the outer ring like dicots (such as apple tree)---so you can't "line up the plumbing" and the plant can't get nutrients across the graft so it dies :(
Ice crystals formed out in outer-space forming an optical halo around the moon. It's actually more common than you think.
The outer layer of the tooth is the enamel, a material composed of calcium carbonate, magnesium carbonate, proteins, etc. Bacteria then form an outer biofilm around this called plaque, if not removed the plaque mineralizes forming what is called calculus or tartar.
The main reasons of atoms forming bonds are: * To become stable * to fulfill their outer shell * to form compounds
The positive and negative are attracted
donate the electrons forming a cation.