Monthly Archives: May 2012

5.5B Classification

Data-based question: a simple food web

1. Both are part of the highest trophic levels of the food web. However, B. bakeri is more productive

2. Ranatra montezuma and Belostoma bakeri

3a. Metaphyton –> Hyalella montezuma –> Telebasis salva –> Belostoma bakeri

3b. Telebasis salva

5. -95%

6. Some organisms can be considered to be in more than one trophic level. Also, some organisms, as they grow older and bigger, move up trophic levels.

5.5a Classification

Data-Based Question: Classifying Cartilaginous Fish

1a. 2 orders are needed to classify the 8 species of fish. They ca be separated s we  into two  groups–the flat (stingray) fish and the thin streamlined fish (shark-like).

2. The fish on the right in the middle row, since this fish seems like a cross between the streamlined fish and flat/square fish. It has a flat body but a streamlined tail.

5.3 Populations

1. One factor could be limited food sources. Another factor could be increased competition within the population.


5.4b Evolution

Data-based question: Galapagos finches

1a. Since 1995, the population increases until 2003, from which it starts to decrease.

1b. Firstly, both populations peak at 2003 and then start to decline. Secondly, the G. fortis population is much higher than the G. magnirostris population. Lastly,

2. Minimun= 294 birds per km2

maximum= 4411 birds per km2

5.4a Evolution

Data-based question: domestication of corn 

1. 1114% increase in length

2. 2633% increase in yield

3. There are several factors that will be selected for farmers such as the texture of the seed and the color.