exam 4

the major components of Earth's atmosphere from the lowest concentration to the greatest concentration are

carbon dioxide, oxygen, and nitrogen

today, the major danger to species is

destruction of habitats

arrange the following stages in order: 1. secondary oocyte 2. oogonium 3. ovum 4. primary oocyte

2>4>1>3

the _______ realm has long been separated from other landmasses and is the area in which marsupials are particularly common

Australian

what is a typical feature of k-selected organisms

a low reproductive rate

which of the following is a characteristic of desesrt plants

adaptations that conserve water

what environment is characterized by high nutrient inputs and by relatively great fluctuations in salinity and temperature

an estuary

in males, gonadotrophin-releasing hormone stimulates the ______ to secrete _______

anterior pituitary; FSH and LH

marine snow is a major source of energy for the _______ region of the ocean

aphotic

_______ is an index of the variety of living organisms in an ecosystem

biological diversity

stratuspheric ozones is important because it

blocks solar UV radiation

in the female, the _________ serves as a temporary endocrine gland and secretes

corpus luteum, progesterone and estrogen

the world human population has increased due to

decreased death rates

A(n) _______ is the transition zone where two ecosystems meet and intergrade

ecotone

a species numbers are so severely reduced that it is in imminent danger of extinction throughout all or a significant part of its range. This species would be considered

endangered

the ability to meet humanity's current needs without compromising the ability of future generations to meet their needs is

environmental sustainability

sexual reproduction invovles which of the following processes

fertilization

one primary spermatocyte ultimately produces

four mature sperm

building. roads, parking lots, building and bridges all contribute to

habitat destruction

which of the following is NOT a shared characteristic that makes threatened. and endangered species vulnerable to extinction

having a broad range

the tropical rain forest biome is characterized by

high density of plants, but nutrient poor soil

______Includes the establishment of parks and reserves, concentrates on preserving biological diversity in nature

in situ conservative

the southern hemisphere has no equivalent of the borded forest of the North. WHy

it has very little land in the corresponding latitudes

what hormone stimulates ovulation

luteinizing hormone

a population that is divided into several local populations among which individuaals occasionally disperse is known as

metapopulation

some animals are facing extinction as a direct result of deliberate efforts to exterminate them because of their perceived harm to economically useful species. Examples include

mountain lions and wolves

which process is not involved in the hydrologic cycle

nitrification

nitrogen is a critical requirement for living organisms because it is a compnent of

nucleic acids and proteins

biotic pollution(invasive species) has been particularly harmful to native species

on islands

fertilization normally occurs in the

oviducts

an example of a density-dependent factor that influence size of a population is

parasites

the effect of DDT on birds is a result of which characteristics of DDT

persistence, bioaccumulation, anad biological magnificaation

fixation of carbon is accomplished by

photosynthetic organisms

which of the following series correctly represent the hieerarchial organization

population, community, ecosystem, biosphere

natural selection acts most directly on

populations

in large measure, differences in_______ that are due to variations in the amount of ________ at different locations on Earth drive the circulation of the atmosphere

rainfall; solar energy

one function of the developing follicle is to

secrete estrogens

which of the following is NOT a condition that is likely to lead to clumped population dispersion

severe competition among indivuals

one advantage of sexual reproduction over asexual reproduction is that

sexual reproduction promotes genetic diversity

an example of primary sex charactersitc in males is

spermataogens

the logist equation

takes into account the carrying capacity of the environment

the greatest proportion of which two biomes have been converted to agriculte

temperate deciduious forest and temperate grassland

near the poles, what. is generally the overriding climate factor

temperature

what two abitoic factors are considered to most affect organisms

temperature and water

which trophic level would contain the lowest quantity of energy

tertiary consumers

net primary producitivty represents

the amount of biomass in excess of that needed to support cell respiration

which statement reflects a key concept about ecosystems?

there is a one-way flow of energy through the foods web of ecosystem

which of the following characteristics applies to biomes

they encompass interacting landscapes

the earths carrying capacity is

unknown

when. r=-0.00057, the population size

will decrease