Question

exam
part a: multiple choice (10 questions, 3 points each = 30 points total)

1. which element is found in all organic molecules?

a) nitrogen
b) carbon
c) phosphorus
d) oxygen

1. which correctly lists the levels of biological organization from smallest to largest?

a) organism → population → community → ecosystem → biosphere
b) cell → organ → tissue → organism → population
c) population → community → biosphere → ecosystem → organism
d) organ → cell → tissue → organism → ecosystem

1. succession involves a pioneer species?

a) secondary
b) primary
c) tertiary
d) quaternary

1. which cycle returns nitrogen to the atmosphere?

a) carbon cycle
b) water cycle
c) nitrogen cycle
d) phosphorus cycle

1. which level of ecological organization includes both living and nonliving components?

a) population
b) community
c) ecosystem
d) biosphere

1. which of the following is an example of a density - dependent limiting factor?

a) earthquake
b) flood
c) predation
d) wildfire

1. a group of the same species living in the same area at the same time is called a:

a) ecosystem
b) population
c) community
d) habitat

Explanation:

1. Organic molecules are defined by the presence of carbon.
2. The correct biological - organization hierarchy from smallest to largest is cell - tissue - organ - organism - population - community - ecosystem - biosphere.
3. Primary succession involves a pioneer species colonizing a previously uninhabited area.
4. The nitrogen cycle returns nitrogen to the atmosphere through processes like denitrification.
5. An ecosystem includes both living (biotic) and non - living (abiotic) components.
6. Predation is a density - dependent limiting factor as it is influenced by population density.
7. A group of the same species living in the same area at the same time is a population.

Answer:

1. b) Carbon
2. B) Cell → Tissue → Organ → Organism → Population
3. b) Primary
4. c) Nitrogen cycle
5. c) Ecosystem
6. c) Predation
7. B) Population