New York State Chemistry RegentsNew York State Earth Science Regents

 
Ecology
Living Environment Regents June 2003 Question 07 PDF Print E-mail
Ecology

lejun03q07

Correct Answer: (2) Community

Community is a collection of population of species living in a certain area at the same time. This community includes various organisms interacting with each other.

Incorrect Answers:

Ecosystem is made up of communities interacting with each other. The picture only captures one area; therefore it is just a community.

A population is composed of a number of organism belong to the same species which interbreed, live in the same area at the same time.

Species is a living individual controlled by the abiotic factors in its environment.

 
Living Environment Regents June 2003 Question 13 PDF Print E-mail
Ecology

lejun03q13

Correct Answer: (3) organic compounds

Heterotrophs, particularly chemoheterotrophs consume organic molecules for both energy and carbon.

Incorrect Answers:

No heterotroph consumes energy from water molecules.

No heterotroph consumes energy from oxygen molecules.

Chemoautotrophs obtain energy by oxidizing inorganic substances.

 
Living Environment Regents June 2003 Question 20 PDF Print E-mail
Ecology

lejun03q20

Correct Answer: (2) A population of organisms few variations living in an unstable environment

A population is a group of organisms of one species that interbreed and live in the same place at the same time. The population described in option 2 will find it hard to maintain their existence because of the less number of characters that can enable the population to survive in the unstable environment.

Incorrect option:

The population described in option 4 is the population that will most likely to survive the longest. Having many variations mean that they have a wide range of characters that can enable them to survive. Added to this condition, their environment is stable, thus, there is less effort to compete and be the fittest population in the community where they belong.

 
Living Environment Regents June 2003 Question 27 PDF Print E-mail
Ecology

lejun03q27

Correct Answer: (3) natural selection does not occur

Natural selection refers to differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment. If natural selection does not occur over a long period of time, certain traits of the species will deteriorate and further become vestigial in function.

 
Living Environment Regents June 2003 Question 29 PDF Print E-mail
Ecology

lejun03q29

Correct Answer: (3) carnivores

Carnivores are organisms that feed on other animals only. The polar bears planned to eat the human, which is another animal.

Incorrect Answers:

Herbivores feed on plants only.

Parasites are organisms that survive because of int complete dependence on another organism.

Producers are organisms that can produce their own food by the use of sunlight. Examples of producers are plants and chlorophytes.

 
Living Environment Regents June 2003 Question 30 PDF Print E-mail
Ecology

lejun03q30

Correct Answer: (4) the process of ecological succession

This is an example of primary succession. Primary succession refers to the colonization of new areas by living organisms.

Incorrect Answers:

Option 1 is incorrect because it is a false statement. If a new island is formed, there must be n increase in the amount of organic material in that area.

Decrease in the levels of abiotic factors will not lead to colonization by many living organisms.

 
Living Environment Regents June 2003 Question 32 PDF Print E-mail
Ecology

lejun03q32

Correct Answer: (1) convert large molecules into simpler molecules that can then be recycled

Decomposers such as saprotrophic fungi and bacteria absorb nutrients from nonliving organic material such as corpses, fallen plant parts, and the wastes of living organisms, and transform them into inorganic forms.

Incorrect Answers:

Heat cannot be recycled.

Not all decomposers can fix carbon dioxide to make their own food source. Those that has the ability to do such are autotrophs.

The decomposers recycle and breakdown molecules of dead organisms and returned to the abiotic environment in forms that can be used by plants.

 
Living Environment Regents June 2003 Question 33 PDF Print E-mail
Ecology

lejun03q33

Correct Answer: (2) carrying capacity

Carrying capacity (K) refers to the maximum population size that can be supported by the available resources like energy, minerals, and oxygen.

Incorrect Answers:

Biological feedback is a method of metabolic control in which the end-product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.

Homeostasis is the steady-state physiological condition of the body.

Biological diversity refers to the variety of the living organism in a specific area.

 
Living Environment Regents June 2003 Question 37 PDF Print E-mail
Ecology

lejun03q37

Correct Answer: (3) at pH 4 and pH 10 the environment is too acidic or too basic for the bacteria to grow.

Populations flourish whenever the abiotic factors are favorable. In this case, the optimum pH level for the growth of the bacteria is pH 8.

Incorrect Answers:

Bacteria do not undergo fertilization in order to form colonies. Most bacteria reproduce asexually by binary fission.

 
Living Environment Regents June 2003 Question 40 PDF Print E-mail
Ecology

lejun03q40

Correct Answer: (3) It consumes preformed organic molecules.

Heterotrophs are organisms that obtain organic food molecules by eating other organisms or their by-products.

Incorrect Answers:

Organisms that produce their own food by photosynthesis are called photoautotrophs.

Heterotrophs usually do not stay in one place for its entire lifetime because they need to hund for food unlike the autotrophs. Example of a heterotroph is the eagle.

 
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