Ecology

In sustainable soil management, farmers alternate cereal crops with legumes such as cowpeas or groundnuts in successive seasons. Which of the following environmental management outcomes is primarily achieved by this crop rotation practice?

Match each ecological succession stage or scenario listed on the left with its corresponding characteristic colonizer or community attribute on the right.

During a field study of a tropical rainforest ecosystem, ecologists examine the breakdown of fallen leaf litter on the forest floor by bracket fungi. Which of the following statements correctly describes the functional role and mode of nutrition of these fungi within the ecosystem structure?

Atmospheric pollution by industrial emissions can lead to terrestrial ecosystem degradation through acid deposition. Arrange the following sequential steps in the correct order to illustrate how acid rain forms and subsequently causes forest decline, starting from initial pollutant emission to final biological effect.

Which of the following gaseous atmospheric pollutants is primarily responsible for the depletion of the stratospheric ozone layer, leading to increased exposure to harmful ultraviolet radiation?

An ecology student placed a $0.5\text{ m}^2$ quadrat $10$ times at random within a plot in Okomu National Park to estimate the population of Siam weed (*Chromolaena odorata*). If a total count of $120$ Siam weed plants was recorded across all sample throws, what is the estimated population density of Siam weed in plants per square metre?

In a freshwater pond ecosystem, bacteria and fungi decompose organic detritus on the pond bed, releasing inorganic nutrients into the water. Which ecological role best describes these microorganisms, and what is their primary contribution to ecosystem stability?

Match each environmental pollution control technique on the left with its corresponding primary ecological mitigation impact on the right.

In nitrogen cycling within terrestrial ecosystems, distinct groups of prokaryotes fix atmospheric nitrogen ($N_2$) under specific environmental conditions. Which of the following free-living, anaerobic microorganisms is directly responsible for fixing atmospheric nitrogen gas in soil?

During a marine ecology survey, research scientists record organisms possessing heavy calcareous shells, strong muscular foot attachment mechanisms, and flexible holdfasts capable of enduring wave turbulence and periodic atmospheric exposure during low tide. Which marine aquatic zone do these organisms inhabit?

A volcanic eruption deposits a thick layer of lava over a coastal woodland, destroying all existing vegetation and organic soil. Over several centuries, lichens colonize the cooled basalt rock, followed sequentially by mosses, ferns, shrubs, and ultimately a climax rainforest. Which of the following best explains why succession on this lava substrate takes significantly longer to reach a climax community than succession on abandoned agricultural land?

During a field study on population dynamics in a secondary forest plot in Ogun State, $80$ African giant land snails (*Archachatina marginata*) were captured, tagged, and released back into their habitat. A fortnight later, a second sample of $50$ snails was collected, revealing that $16$ of them bore the original tags. What is the estimated total population size of these snails in the forest plot using the Lincoln Index?

Match each organism or plant group with its characteristic morphological or physiological adaptation to its environmental habitat.

In a tropical savanna river valley, two bird species live within the same geographic locality. The Cattle Egret feeds primarily on terrestrial insects disturbed by grazing mammals, whereas the African Fish Eagle hunts aquatic fish from the river. Which of the following ecological terms best describes the distinct functional roles and resource utilization patterns of these two species?

Match each biological organism or indicator listed on the left with its corresponding ecological application or environmental pollution condition on the right.

In Nigeria, transitioning northward from the tropical rainforest into the Guinea savanna zone presents organisms with prolonged dry periods and frequent seasonal fires. Which of the following morphological adaptations is most characteristic of dominant tree species established in the Guinea savanna biome?

During an ecological survey of a newly formed coastal sand dune (psammosere), researchers monitor changes in plant community structure, soil organic content, and microclimatic conditions over a period of 150 years. Which of the following trends accurately describes the ecological changes that occur as this primary succession progresses toward a climax community?

A power plant routinely discharges high-temperature cooling water into a freshwater stream, raising the mean water temperature by several degrees. Which of the following best describes the primary immediate ecological consequence of this thermal pollution on the stream's fish population?

Match each ecological sampling instrument or technique with its most appropriate sampling application in field biology studies.

Match each seral stage of hydrarch succession (hydrosere) in a freshwater habitat on the left with its corresponding characteristic vegetation or ecological role on the right.