• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month


Extracts from this document...


THE IMPORTANCE OF BEING THE RIGHT SIZE Different organisms are of different sizes. If I take an example of two organisms such as an amoeba, which is a single celled organism and an elephant, which is a multicellular organism I can see that they are obviously of different sizes. AMOEBA ELEPHANT Since an amoeba is small it has a large surface area compared to its volume. Since an elephant is large its surface area is small in comparison with its volume. As can be seen below if one increases the surface area of an object, the total volume increases but the surface area: volume ratio decreases. 3cm 2cm 1cm Total SA= 6 24 54 Total Vol= 1 8 27 SA:Vol= 6:1 3:1 2:1 An amoeba exchanges with the environment by occurring across the entire body surface through the cell membrane. ...read more.


Fish use gills to take the dissolved oxygen from the water. However the process is not easier, this is because the water is much heavier and thicker than air, so it takes a lot of energy to extract. Since fish are cold blooded they do not need oxygen that much. But warm-blooded animals such ourselves and whales are in demand of more oxygen so they have lungs to get oxygen from the air. There are advantages for organisms being large such as they can avoid being eaten because they are too large to be eaten. They can eat more things because they are large. They can move longer distances to new food sources or more favourable environments. They can be endothermic, which means that they can generate their own heat to maintain their body temperature, typically above the temperature of their surroundings. ...read more.


For large organisms they have a small surface area so they do not lose heat by radiation therefore most of their heat is kept in. Endothermy is also possible in large organisms so they are kept warm and so can survive in cold climates. This is why they are found at high latitudes because high altitudes have low temperatures. Allen's Law Within any one group of organisms, those at the highest latitudes have smaller extremities than those in the tropics. Transpiration rates Large leaves get more water needed for photosynthesis, which makes food for the plant. Large leaves are needed to catch more light to trap the chlorophyll needed for photosynthesis. Large leaves can cause more water to be lost by transpiration because surface area: volume ratio is decreased. ?? ?? ?? ?? Vaaheesan Sundaraanantham 1 Dr Dixon ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    First the glucose is converted to pyruvate through a series of biochemical pathways collectively known as glycolysis, which occurs in the cytoplasm of the cell. The pyruvate is then decarboxylated and dehydrogenated to acetyl coenzyme A, which subsequently binds to oxaloacetate to form citrate.

  2. Ecology of leaves

    I believe the use of a 1cm grid square and the presence of perforated leaves led to anomalies in my results. To counter these problems I could have used a more accurate method to measure the leaves surface area, such as using a computer scanner and software to measure the leaves surface area.

  1. Why the Body Needs Energy? Every living cell within the ...

    The Structure of the Alveoli * The alveoli are made of thin layers of squamous epithelial cells and are surrounded by a capillary network. The Function of the Alveoli * The exchanges of gases between the circulatory and respiratory systems.

  2. The Importance of Being The Right Size.

    Every organism varies considerably in size. For example, the size of amoeba (protozoa) and is 10�m, whereas the size of blue whale (animal) is 30m, which is 30 million �m. We are able to recognize that blue whale is 3 million times bigger than amoeba.

  1. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic for Vertebrates.

    Endotherms are an inverse of ectotherms; where ectotherms rely upon thermal conductance to increase body temperature, endotherms control their body temperature by heat produced from metabolism, and they have a low thermal conductance to retain this heat. Endotherms have up to five times more mitochondria than ectotherms, and in addition,

  2. Discuss the Advantages and Disadvantages of being Ectothermic and Endothermic in the Vertebrates.

    Man is a homeothermic endotherm, while some fish are homeothermic ectotherms. Heterotherms are capable of varying degrees of endothermic heat production, but they generally do not regulate body temperature within a narrow range. Temporal heterotherms are generally facultative endotherms who relax their metabolic production of heat at certain times, for example during hibernation.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work