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1. Explain why any one species cannot live everywhere. Any species cannot live everywhere because this would effect the natural balance. Also one species cannot adapt to all the different environments of our planet. For example a marine creature can only live underwater and cannot live on ground. 2.
Explain how the activities of some species can lead to: a) an increase b) a decrease in the population size of another species. Some species act as population controllers of other species. There must be a balance between the two and this is important to a healthy landscape. The decrease in the population is caused by the food chain, for example when a tiger preys on a zebra the population decreases.
The increase of the population of a species is caused by the predator when it stops feeding on a species lower than the predator in the food chain. So when the predator stops or reduces the amount of feeding on a species, the population of the species would start to increase. 3. It is seldom possible to count all the individuals in a given space. Explain one method by which biologists can study population densities without obtaining such data. Scientist barely ever count the amount of individuals in a certain area because it would take too much time. Instead of actually counting the number of individuals in an area they would compare it with other areas where they know the population of individuals.
In this way they can roughly estimate the number of individuals in a certain area. 4. What might happen to a rabbit population in an area where there are no predators? If there were a few rabbits in an area with no predators they would over-populate and cause serious damage to the ground. Since they are fast at reproducing there is nothing to control the population level as the predators do so they damage the eco-system and the land is unsuitable for any crops. 5.
In which way does communication assist the survival of members of a society, give examples. Communication is essential to the survival of a society. Ants and bees are the most social of all animals as they live in a complicated and well-built ranking system. In the society of ants, every ant works for the benefit of society, and not for himself alone.
To do this, it must have a highly developed way of communicating with its fellow ants, of which it does. 6. Some people regard human beings as territorial animals. Explain. The means that human beings claim their surrounding territory for their own and cultivate and nurture it into a thriving community. In the wild, most predators are territorial and not herbivores. In mammals, wild cats that are not a part of each others groups fight for territory so they have no concerns of another group taking away their food supply.
Magpies for example attack other individuals when the individual gets anywhere near their tree, this occurs especially when they have new born's. 7. Consider a classroom aquarium or a small pond as a habitat. Give examples of micro habitant's it might contain. A pond or aquarium may contain some micro habitats and different micro environments. For example, one might be the micro habitat on a plant, and this would contain all sorts of bacteria and other small life forms. 8. What is the difference between a food chain and a food web?
A food web is the process of supplying food to other groups of animals. In a food web the sun is the main source if energy in the eco-system and the light energy is absorbed by the plants and convert this energy in to chemical energy and is stored in its cells. Then the herbivores take the plants as a food supply and the energy that is within the plant is then changed to another form of energy which is then passed onto the carnivores. Then the carnivores decompose the waste products and the plants absorb the energy from the waste material left by the carnivores.
A food chain is different because it is a representation of what animals eat and what the animals that they eat. If this chain is disturbed by mass hunting, it could destroy the chain, and it could drive all creatures that are a part of the chain extinct. Food Web Food Chain PLANKTON SUN PRAWN DECOMPOSED MATERIAL PLANTS TROUT CARNIVORE HAWK HERBIVORE 9. Whats a predator / prey relationship, competition and parasitism? A predator / prey relationship is that of two different species which are on different levels on the food chain. The predator eats the prey and becomes stronger.
The predator may fight with another predator for the prey. Parasites such as ticks and pilot fish feed off the predators crumbs, leftovers or sometimes, on the predator itself making the predator the prey. 10. Describe how their non-living environment affects organisms and how organisms can affect their non-living environment. All organisms need to adapt to their nonliving environment to either survive or adapt to the climate. Organisms also affect their nonliving environment by changing it to their own liking. An example of this is man and the beaver who constructs massive dams of fallen logs. 11.
Explain one argument for conservation. Conservation is needed for many reasons, but mainly because nothing lasts forever. Fossil fuels will run out eventually, natural gas will run out also and so will timber and forest. Because of this, these resources must be used sparingly. Alternate energy sources and recycling are a great way to do this. We must be aware that we are not the only ones on this planet and we must set aside some for the other animals of this world. 12.
Brief definitions of the following. Population: is the number of individuals in an area at a particular time Community: is a group of individuals in an area Habitat: is a dwelling of any living thing Niche: is a place where a person is best fitted 13. Write brief essay on a major environmental problem facing our world today. A major environmental problem facing our world today is the Global Warming. This is the increase of the earths temperature caused by the use of fossil fuels and other industrial processes leading to the build-up of greenhouse gases in the earths atmosphere. Greenhouse gases consist of carbon dioxide, methane, nitrous oxide and chlorofluorocarbons.
The increasing amount of carbon dioxide in the earths atmosphere is decreasing the amount of radiation to pass through to get back to space. This is causing the earths temperature to rise gradually, this is called the Greenhouse Effect. The Greenhouse effect is mainly caused by the use of fossil fuels and other chemicals that are released into the air. The amount of carbon dioxide in the atmosphere has nearly doubled during the past one hundred years. The main problem which has caused this is the excessive use of fossil fuels and the number of trees that are cut down has made the problem worse. As trees remove carbon dioxide from the air as a part of their natural processes but humans are cutting down too many forests and too much usage of fossil fuels.
As humans have been cutting down trees, the capacity of trees to remove carbon dioxide from the air has heavily decreased. There also more problems that the Greenhouse effect can cause Global Warming. If Global Warming causes a bit too much increase in the earths temperature it can melt the Polar Ice caps. This is one major problem. If the ice caps melt they can cause floods on the coastal cities all over the world, destroying homes and major towns. Since 1850 the earths temperature has risen about 1 |C on average.
This was thought to be a natural fluctuation but they were still unsure if it was Global Warming or natural fluctuation. Then in 1995 the British Meteorological Office claimed the year to be the warmest year recorded. United Nations group of scientists attributed the cause of the rise of temperature on the humans usage of fossil fuels. They had also predicted a 1 |C to 3. 5 |C. They also estimated by 2100 to be a 2. 0 |C increase, if this is a fact the sea level will rise by 50 centimetres, and obviously more Global Warming will follow with the sea level to rise more. The possible consequences of Global Warming are so great, the worlds top scientists have urged immediate action and have called for international cooperation on the problem.
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Research essay sample on Amount Of Carbon Dioxide Fossil Fuels
