Ecology Exam Practice Questions - Samer

What is the primary mechanism for heat exchange in plants to reduce solar radiation?

Evaporation

Which adaptation helps a plant located in high temperatures to decrease heat absorption?

Waxy cuticle and curled leaf orientation

In an environment where daily mean temperatures fluctuate from 15°C to 30°C, how many days would it take for an organism requiring 80 degree-days above a threshold of 20°C at a daily mean temperature of 25°C?

10 days

What factor is most critical in determining how animals regulate their body temperature?

Surface area-to-volume ratio

If an endotherm is exposed to extreme cold, what mechanism is most likely to help it maintain its body temperature?

Insulation through fur or fat

What does a desert plant with deep, wide-spreading roots adapt to in its environment?

High water availability

What is a potential drawback of relying on high metabolic rates to regulate temperature?

Increased energy expenditure

What metabolic change is an animal undergoing hibernation most likely to experience?

A substantial decrease in metabolic rate

During extreme heat, which mechanism helps plants maintain water balance?

Evapotranspiration

Why might a large ectotherm in a hot climate have difficulty maintaining its body temperature?

It cannot effectively use evaporative cooling.

What features would a researcher studying the tropical rainforest biome expect to find?

Evergreen trees with little light reaching the forest floor

What adaptation would you expect to find in many desert plants?

Thick, waxy leaves

What climatic conditions would a researcher observing a Mediterranean biome expect?

Hot, dry summers and mild, rainy winters

What characteristic would most likely be found in a temperate deciduous forest during winter?

Leaf loss due to cold winters and low precipitation

What would be most common in the vegetation of a temperate grassland biome?

Grasses with extensive root systems

Which feature is most likely found in the tundra biome?

Permafrost with low temperatures year-round

In a freshwater lentic system, which zone is dominated by phytoplankton?

Photic zone of the pelagic zone

Which biome is characterized by low temperatures and evergreen conifers at 50° to 65°N latitude?

Boreal forest (taiga)

Which zone in a marine ecosystem supports the highest density of organisms?

Photic zone of the pelagic zone

What would you expect to find in an estuary biome where fresh and saltwater mix?

High biodiversity with fish species in their juvenile stages

What term refers to the largest category of ecosystem often associated with global climate patterns?

Biome

What is the zone in a river system where organisms are classified as nekton?

Pelagic zone

What process allows organisms in marine environments to obtain energy from falling detritus?

Detritus feeding

What describes the low-temperature, high-pressure environment found on the ocean floor?

Benthic zone

What climate type is characterized by mild, rainy winters and hot, dry summers?

Mediterranean

Which zone in a lake or pond is where light penetrates and supports phytoplankton growth?

Photic zone

What is the permanent layer of frozen soil found in boreal forests and tundra?

Permafrost

What is the habitat type at the junction between terrestrial and marine ecosystems?

Intertidal zone

What biome is characterized by high species diversity, high biomass, and located near the equator?

Tropical rainforests

What does 'lotic' refer to in a freshwater ecosystem?

Flowing water systems like rivers and streams

How does proximity to a mountain range influence precipitation?

The windward slope receives high precipitation, while the leeward slope receives little.

What factor would likely cause a significant decrease in precipitation?

The region is located at 30°N or 30°S latitude.

How would an El Niño event affect the Eastern Pacific climate?

It would experience more rain and flooding than normal.

What is the primary cause of climate variation between tropical and polar regions?

The amount of solar radiation received, which varies based on latitude.

Why do coastal areas have a smaller variation in temperature compared to continental interiors?

Water has a higher specific heat than land, which means it heats and cools more slowly.

What occurs at approximately 0° latitude in the Hadley cell?

Air rises, cools, and forms precipitation.

How does the Coriolis effect influence wind patterns?

It deflects winds to the east in the Northern Hemisphere and west in the Southern Hemisphere.

What happens during the summer solstice at 23.5°N due to Earth's tilt?

The Northern Hemisphere would experience the longest day.

What might happen to Earth's climate if the shape of its orbit becomes more elliptical?

Earth’s climate would fluctuate more, experiencing colder winters and warmer summers.

What is a main consequence of deforestation in tropical regions regarding climate?

Decreased precipitation and warmer local temperatures.

Which factor contributes to amphibian limb deformities?

Exposure to pesticides, which weakened the amphibians' ability to resist parasites.

What helps ensure the reliability of results in the case study of amphibian limb deformities?

Randomly assigning treatments to the experimental groups.

How does the presence of trout in a lake influence frog populations?

It reduces the frog density, likely due to predation.

What would be the best approach for ecologists to study the effects of pesticides on amphibians?

Field observations in areas with and without pesticide exposure.

Why were ponds divided into those with small mesh and large mesh cages for tadpoles?

To prevent parasites from passing into some of the ponds.

What does 'organismal ecology' refer to?

The study of how organisms adapt to their abiotic (nonliving) environment.

What best defines 'population ecology'?

The study of the factors that affect population dynamics, such as density and growth.

What is the focus of 'community ecology'?

The study of the interactions between all species within a given area.

What does 'ecosystem ecology' study?

The study of energy flow and nutrient cycling within an ecosystem.

What does 'biosphere ecology' focus on?

The study of the global distribution of ecosystems and the processes influencing them.

What is the main difference between weather and climate?

Weather refers to the current conditions; climate refers to long-term weather patterns.

What does the 'Coriolis effect' refer to?

The deflection of wind patterns due to Earth’s rotation.

What is the 'Hadley cell' in atmospheric circulation?

A large-scale wind pattern between the equator and 30° latitude that causes tropical climates.

What is the 'rain-shadow effect'?

The drying effect caused by winds descending from the windward side of mountains.

What is 'ocean salinity'?

The concentration of dissolved salts in ocean water.

What is 'lake stratification'?

The formation of layers in a lake based on temperature and salinity differences.

What is 'atmospheric uplift'?

The process by which air rises due to heat, cools, and forms clouds.

What does 'subsidence' refer to in atmospheric circulation?

Air descending after cooling, leading to dry conditions.

What is the definition of 'continental climate'?

A climate found in the interior of continents with greater temperature variation.

What does 'seasonal variation in climate' mean?

The changes in climate patterns over the course of a year due to Earth's tilt.

What describes the amount of heat an organism exchanges due to liquid to gas conversion?

Latent heat

What is the role of enzymes in temperature-dependent physiological processes?

They catalyze reactions faster at higher temperatures.

What is the boundary layer in relation to plant heat exchange?

The air layer next to a leaf that influences heat exchange.

What does 'physiological age' refer to?

The time it takes an organism to reach a specific developmental stage based on accumulated degree-days.

What describes when an organism’s body temperature aligns closely with the surrounding environment?

Torpor

What does 'supercooling' help prevent in cold-adapted organisms?

Freezing of body fluids by lowering their freezing point.

What describes heat exchange through direct contact between solid objects?

Conduction

What process releases excess heat through conversion of liquid to vapor?

Evaporation

What defines 'ectotherms' in terms of body temperature regulation?

Their body temperature is controlled by environmental factors.

What describes the heat generated internally by some animals through metabolic processes?

Metabolic heat.