The etymology of cotyledon takes us to a Greek word that refers to what is shaped like Cup . That term came to Latin as cotylēdon.
That Latin word we have to expose that since the first century it was used to refer to a plant called the navel of Venus. Specifically, we would have to wait until the 18th century, specifically until the year 1751, for Linnaeus to give it the meaning with which we use it today and understand it.
In the field of botany , it is called cotyledon to the first sheet that arises in the embryo of a phanerogam plant . These plants are those that have visible reproductive organs in the flower, where fertilization takes place and the development of the seeds that house the embryos of the new specimens takes place.
The first leaves of these embryos are called cotyledon. In the seedlings (denomination of plants just sprout from the seed ), cotyledons can be distinguished from the rest of the leaves by size . On the other hand, cotyledons have characteristics that secondary leaves do not have, such as the ability to develop digestion of albumen (the tissue that is around the embryo and that is used as food after germination) or the fact of having different nutrients
In addition to all of the above, we cannot ignore the fact that, depending on where these cotyledons appear, plants are classified into two different types:
-The hypogeas are those in which the aforementioned cotyledons appear underground.
-The epigeal plants are those that are characterized because those are born outside of what the earth is.
Of course, regardless of whether they leave outside or inside the earth, cotyledons still have the same function. And it is none other than feeding the seedling.
Plants that have seeds with a single cotyledon are known as monocotyledonous . Corn, wheat, orchid and bamboo They are some of the monocotyledonous plants. In this group we can also include orchids or palm trees.
The dicot Instead, you have two cotyledons. Magnolia, avocado, cinnamon and pink They are part of the whole dicotyledonous plants.
It is important to keep in mind that cotyledons have a limited life: when the plant has already managed to develop the leaves that allow it to obtain Energy , they end up falling.
In the same way, we can highlight other relevant aspects about cotyledons such as the following:
-The development of these takes place during what is known as embryogenesis, which is composed of two phases: in the first one there is mitosis, that is, the increase in the number of cells and in the second what is called cellular expansion
-Among the nutrients that have the cotyledons and that make them different from other leaves of a plant are both the starch as would be the case with oil.