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Plant growth and adaptations
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Plants have two different ways to reproduce. The first one is vegetative reproduction. With this type all the plants that have the same parent have the same genetic make-up. This also lets plants pass adaptations on that they have abtained over the years. Plants with good genetic make-up usually spread quickly and take over an area. An example of this would be the dandelion. These plants can sprout from any part of the plant. An example of this is the potato, farmers will pick the potatoes and cut them into small pieces and then plant them again so they may grow again. Scientists have also placed a branch from one tree and place it on another one; it is now possible to buy an apple tree with six different branches and six different types of apples. The more common way to reproduce is sexual reproduction. In order for this to happen gametes must be produced and fertilized. Seeds, fruits, and embryos must also be developed. The two main advantages of reproducing this way are new genetic combinations and seeds spread over a large area. The following are the reproductive parts in this process. The first part is the flower, which has four types of modified leaves. The first one is the sepal, which protects the other parts of the plant. The second is the petal, which is located inside the sepal. These are normally bright in color to attract animal pollinators. The third is the stamen, which is the male or pollen producing substance. The stamen contains anthers, which is were poll...
...ough genetic variability is generally a good quality, sometimes plant characteristics that are considered favorable by commercial propagators can be lost through genetic mutation during sexual reproduction of seed propagation. Also, sexual propagation through seeds is not always feasible for commercial propagators because of the length of time from germination until you have a fully developed plant (Horticulture, 2014).
Each plant species has a unique pattern of resource allocation that is genetically determined but not fixed. Plants can adjust there allocation pattern when they experience different environments and the presence of other species. Phenotypic plasticity goes hand in hand with resource allocation as well. When a plant has to adjust itʻs resource allocation, sometimes it uses itʻs resources to help the plant grow different characteristic so that the plant can have a greater chance of living in the environment. For example, if a plant from an environment that does not experience wind on the regular basis enters a new environment that has a lot of wind the plant may change itʻs resource allocation and spend more of itʻs resources growing deeper
Humans have long recognized that flowers are an indication of future fruits. Therefore it was vital for nomadic hunters to remember where in the wild they saw flowers. And further yet each type of flower produced a specific fruit. Thus fruits and flowers had something in common; the preference of one fruit meant the preference of a type of flower. Most often, as in modern times, the most healthy looking flower shows signs that it will produce quality fruit. The beauty of a flower told hunters that a nutritious fruits would ripen after the flowers bloomed. This concept explains how we have evolved toward preferring healthy looking flowers. But how does this explain the security of a plants reproduction? It is necessary to mention that plants not only produce fruits to stop herbivores from eating the plant, but in their own diabolic plan, plants found a new way to spread their seeds through fruits. Herbivores would eat the fruits an...
Throughout life there will always be obstacles to overcome. Whether it be personal, work related, or just trying to figure life out. There is not one person who is immune to these things. Unfortunately, there is not one person who is immune to discrimination either, which is why we, as human beings, must make a greater attempt to recognize the differences every individual has to offer, and embrace whatever it is to it’s full potential. Many feel the pressures that womanhood presents, for instance. Not to say there isn’t burdens that are exhibited with manhood, but there still remains some hefty barriers on the road to 21st century equality. It is a fact that men are met with greater confidence in the workplace, while women remain severely underrepresented
The short story "The Chrysanthemums" gives insight into the life of its author. John Steinbeck was born on February 27, 1902, in Salinas, California. The locale of the story is of key resemblance to the Salinas in which Steinbeck was born and bread. "Salinas was a typical American small town, [differing] only in location and a few distinctive features" (McCarthy 3). The protagonist of this story, Elisa Allen, also resembles Steinbeck's first wife. "Steinbeck probably based the character of Elisa Allen on his own first wife, Carol Henning Steinbeck. Like Elisa, Carol was a woman of considerable talent and energy who wore 'masculine clothes' and was 'strong, large-boned' and 'handsome rather than pretty'" (Hughes 23). Similar to the time frame in which Steinbeck lived, the theme of the story comes across as being male dominant and the rustic setting allows us to visualize this.
Acer palmatum has many different varieties that have different colors, leaf shapes, and growth habits. The tree openly pollinates, which means that seeds from a specific cultivar will not be an exact clone of the parent tree. For this reason, propagation f...
Flowering plants have two main reproductive parts; the male part is called the stamen and produces pollen, while the female part is called the pistil. For pollination to occur, the pollen must be transferred from the stamen to the pistil. This transfer can occasionally be caused by wind, but it is most often facilitated by animals called pollinators. Pollinators do not intentionally set out to fertilize flowers; rather, they unintentionally spread pollen while roaming from plant to plant in search of food. There are many different species – including birds, butterflies, and bats – that act as pollinators, and many of these species are also suffering declines in population. However, honeybees are the most pr...
Plant defences are those mechanisms employed by plants in response to herbivory and parasitism. According to Hanley et al. (2007), “the tissues of virtually all terrestrial, freshwater, and marine plants have qualities that to some degree reduce herbivory, including low nitrogen concentration, low moisture content, toxins or digestibility-reducing compounds”. The type of chemical defence may be species specific (Scott 2008). The defences that plants possess may be in the form of chemical production or in the form of physical defences such as thorns or spikes and even through reinforced, rigid leaves. “The compounds that are produced in response to herbivory can either have a direct effect on the attacker itself (e.g. toxins or digestibility reducers), or serve as indirect defenses by attracting the natural enemies of the herbivores” (Bezemer & van Dam 2005). This essay will focus on chemical plant defences and in particular the effects of terpenes, phenolics, nitrogen-based defences as well as allelopathy in plants.
Meiosis is a specialized form of nuclear division in which there two successive nuclear divisions (meiosis I and II) without any chromosome replication between them. Each division can be divided into 4 phases similar to those of mitosis (pro-, meta-, ana- and telophase). Meiosis occurs during the formation of gametes in animals.
In the lab exercise regarding plant structure and function, we examined slides containing the different kinds of roots (monocot, dicot). We labeled the parts and pointed out the different roles of each in the plant structure. Also, we examined monocot stems and dicot stems in order to familiarize ourselves with its external and internal structures. We sketched and labeled the parts of the stem and looked closely at the positions of each part. In the last part of the lab, we classified leaves into different kinds according to their leaf venation, bases of leaves, and apices of leaves. As an additional exercise, we sketched 20 animals and classified them according to phylum and class. We were also able to discover the scientific and common names of the animals. Overall, the exercises we did enabled us to familiarize ourselves with plant structure thus, gaining a better understanding for plant life and its importance.
To delve into the clockwork of this technology we must start from the beginning. A plant starts its life as a single celled organism; the sperm within pollen fertilizes an egg. This egg (cell) divides to form the tissues and organs of a species. As development proceeds cells grow unique of one another and change. Different cells make up different things (ex cells in the stalk of the plant are much different than those of the piston) and these differences are attributed to the fact the different amounts of proteins in each cell.
Insect pollination as we all know, is the process that enables reproduction and fertilization by the transfer of pollen performed by insects. Insects are some of the oldest pollinators of plants. Pollinating insects date back to 140 million years ago. Since then, due to how effective insect pollinators are, these flowering plants have become the major group of terrestrial vascular plants. Flowering plants, also known as angiosperms, have imperative roles within our ecosystems, both natural and agricultural. For instance, insects provide food, fiber and shelter for wildlife and humankind alike (2007). It is commonly know that in humans, high levels of fruit and vegetable consumption are associated with decreased risk of chronic disease (Calderone 2012). Aside from these important roles, plants have also been considered as a viable option for fuel sources (Calderone 2012). There are around 300,00 species of flowering plants in the world and without pollination, the reproductive process would be very difficult since pollination causes the production of seeds (Calderone 2012). Of the 300,000 plant species worldwide, a little over 3,000 of these plants have been used as a source of food. Close to 300 of these species are grown around the world today and only 12 of these plants make up about 90 percent of the food sources in our world. These 12 include the grains...
For many years, nature has cloned organisms. When a plant sends out a stalk and it takes root, the new ...
The plants that we know today as terrestrial organisms were not always on land. The land plants of today can be linked back to aquatic organisms that existed millions of years ago. In fact, early fossil evidence shows that the earliest land plants could have arisen some 450 million years ago (Weng & Chappie 2010). Plants that used to reside strictly in water were able to adapt in ways that allowed them to move onto land. It is speculated the need for plants to move onto land was created by water drying up, causing plants to have less room and pushing them to move onto land. Although the exact cause of plant’s need to move to a terrestrial environment is unclear, it is known that plants had to undergo several adaptations to be able to live on land. These adaptations include: lignin, cellulose, suberin, and changes to plant’s surface, including the formation of a waxy cuticle.
Tissue culture allows for the growth of a plant without the use of seeds or pollination.