All practice questions

A single ancestral bird species colonizes an isolated oceanic archipelago featuring diverse ecological habitats ranging from dense rainforests to arid rocky volcanic slopes. Over time, descendant populations evolve distinct beak structures specialized for crushing hard seeds, probing tubular flowers, and snatching flying insects, eventually losing the ability to interbreed when their geographical ranges overlap. Which evolutionary process and reproductive isolating mechanism are primarily demonstrated in this scenario?

Arrange the following events in the correct chronological sequence during sexual reproduction (zygospore formation) in the bread mould (*Rhizopus*), from the initial contact of hyphae to the formation of a mature zygospore.

During the complete aerobic oxidation of $1$ molecule of glucose in a eukaryotic cell, what is the net number of $\text{ATP}$ molecules produced specifically via substrate-level phosphorylation inside the mitochondrial matrix?

Pair each primary factor of production listed on the left with its corresponding economic reward and operational characteristic on the right.

Paleontological evidence demonstrates that different organism groups appeared at distinct geological times, creating a recognizable biostratigraphic sequence in undisturbed rock layers. Arrange the following fossil groups in chronological order of their first appearance in the fossil record, starting from the oldest (deepest rock stratum) to the most recent (shallowest rock stratum).

Industrial supply chains involve multiple distinct stages of economic production and utility creation. Match each economic activity listed in Column A with its corresponding stage of production or economic utility created in Column B.

In a pure command economy, the fundamental economic decision of 'for whom to produce' is primarily resolved through which of the following mechanisms?

A population of desert pocket mice primarily displays light coat coloration. Following a volcanic eruption, dark basalt rock is exposed in their habitat, creating a new environment. Arrange the following steps describing the evolutionary adaptation of dark fur in this population according to Charles Darwin's theory of natural selection in their correct sequence, from first to last.

A soft-bodied marine organism collected during a field expedition features an unsegmented body, a muscular foot for crawling, and a specialized chitinous rasping structure called a radula. To which phylum does this specimen belong, and what is the chief role of its surrounding mantle tissue?

Match each organism group on the left with its key structural evolutionary innovation on the right.

In economic analysis, markets are classified along multiple structural dimensions including transaction timing, exchange media, regulatory compliance, and market power. Match each market scenario on the left with its correct economic classification on the right.

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?

An agro-processing enterprise operates in the short run with a fixed processing plant and variable labor ($L$). When $3$ units of labor are employed, the average product ($AP$) of labor is $21\text{ units}$. Adding a $4\text{th}$ unit of labor yields a marginal product ($MP$) of $25\text{ units}$. When a $5\text{th}$ unit of labor is hired, the average product ($AP$) declines to $21\text{ units}$. Finally, employing a $6\text{th}$ unit of labor results in a total product ($TP$) of $114\text{ units}$. What is the marginal product ($MP$) of the $6\text{th}$ unit of labor?

An economy recorded a Gross Domestic Product ($\text{GDP}$) of $\text{N}3,500\text{ million}$ and a Capital Consumption Allowance of $\text{N}250\text{ million}$ in a given year. During the same period, factor income earned by citizens residing abroad was $\text{N}180\text{ million}$, while factor income earned by foreign residents within the country was $\text{N}240\text{ million}$. What is the Net National Product ($\text{NNP}$) of this economy?

The table below shows the input requirement in labor-hours to produce one unit of Cassava and one unit of Rubber in Country X and Country Y:

Based on David Ricardo's theory of comparative advantage, what is the maximum number of units of Cassava that Country X would be willing to pay to import $1$ unit of Rubber from Country Y?

In a plant population growing in soil contaminated with heavy metals, a rare pre-existing gene mutation enables certain individuals to tolerate high toxicity. According to the modern synthetic theory of evolution, how does this trait become predominant in subsequent generations?

In public finance, government revenue is categorized based on its structural characteristics and financial sources. Match each government revenue category on the left with its corresponding example on the right.

A government collects payments from private mining companies for the commercial extraction of natural resources from state-owned land. Under which category of public revenue are these payments classified?

During a prolonged drought on an isolated island, small soft seeds became scarce, while large hard-shelled seeds remained abundant. Researchers observed that birds with deeper, stronger beaks survived and reproduced at higher rates than those with shallower beaks. Over subsequent generations, the average beak depth in the population increased. According to Charles Darwin's theory of natural selection, which mechanism best accounts for this evolutionary change?

Under the Petroleum Industry Act (PIA) of 2021, the former Nigerian National Petroleum Corporation (NNPC) was restructured into NNPC Limited (NNPCL) to operate strictly as a commercially viable, profit-driven enterprise regulated by corporate governance standards rather than relying on direct state subsidies. Which economic policy reform best describes this institutional transformation?