NSCI 115 Chapter 4
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- Which substance was not a part of the primitive atmosphere of the Earth?
- oxygen gas
- The subunits that bond together in a protein are
- amino acids
- The main part of the definition of a species by biologists involves
- reproduction
- Select the broadest, most general taxonomic category. a. class b. genus c. kingdom d.phylum
- kingdom
- Select the most specific taxonomic category existing among he following choices a.class b.family c.genus d.order
- genus
- Select the family name for humans
- hominidae
- Eukaryotic cells evolved approximately
- 1.5 billion years ago
- The explosion of life on the Earth corresponds with that appearance of ____ in the atmosphere
- oxygen
- We currently live in the ____ era
- Cenozoic
- The "Age of Dinosaurs" occurred in the ____ era
- mesozoic
- The fist fish species inhabited Earth during the ____ era
- paleozoic
- Select the largest level of the biosphere
- ecosystem
- The most common method of determining biodiversity is to count the number of ____ in an area
- species
- Taxonomists mainly ____
- classify organisms
- The largest number of species on the Earth are ____
- insects
- Estimates of the world's biodiversity are skewed because most biologists live in ____
- North America and Europe
- The most species are found in the ____ regions
- tropic
- In terms of biodiversity, which of the following two areas are least known?
- the tropics and oceans
- On the species are curve as the number of species counted increases the curve ____
- flattens out
- Areas of the tropical rain forests have over ____ times the number of species found in temperate regions
- 100
- One valid estimate of the species number on the Earth is
- 5 million to 100 million
- Which two land biomes experience the most extreme conditions?
- desert and tundra
- The predominant biome of the southwestern United States is ____
- semidesert
- Which of the following is not an adaptation of desert plants?
- broad leafs
- What percentage of the Great Plains in estimated to have been drastically modified over the last two hundred years?
- more than 95%
- There is little tundra in the southern hemisphere because
- the southern hemisphere is mostly ocean
- More of the surfaces of the Earth is covered by ____
- saltwater
- The most complex and diverse biome is the ____
- tropical rainforest
- Select the incorrect description of the grassland biome a. fires are common b. many grazing animals are present c. rainfall is scarce d. the soil in infertile
- the soil is infertile
- Which biome is composed of predominantly coniferous vegetation?
- taiga
- Select the biome among the following that has the most abundant rainfall a. grassland b. taiga c. temperate forest d. tundra
- temperate forest
- The concentration of oxygen ____ with more depth in the lake
- decreases
- The slower-moving stretches usually have ____ oxygen in the water of a stream.
- less
- Free swimming organisms are found in the ____ part of a lake.
- pelagic
- What is needed in a population along with natural selection for the population to evolve
- the individuals of the population must exhibit variation
- What has been the overall trend for species throughout the ages of Earth's evolutions?
- the number of species has been increasing
- Define the term biodiversity
- it is the variety and variability among living organisms and the ecological complexes in which they occur
- What is the method called that uses well-studied groups to predict the diversity of less studies groups
- ecological ratios
- List two reason why icon did not organize the grasslands on a large and long term scale
- Bison were migratory and could be more selective about what they ate
- Which as more diversity, a temperate forest or a coniferous forest?
- a temperate forest
- Why does taiga make poor cropland in general?
- the soil in very acidic, the growing season is too short, there's too little precipitation, and the climate is too cold
- List two factors that affect the distribution of terrestrial biomes on the Earth
- temperate and latitude
- List the depth zones of bent his communities
- littoral, continental shelf, and abyssal