POST UTME UNIOSUN 2025 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a tropical rainforest, the energy flow from producers to primary consumers is typically described by which of the following trophic levels?
A. Producers → Primary Consumers → Secondary Consumers
B. Producers → Primary Consumers → Decomposers
C. Producers → Primary Consumers → Tertiary Consumers
D. Producers → Decomposers → Primary Consumers
Question 2
A plant with a mutation in the gene encoding the enzyme RuBisCO has a 50% reduction in photosynthetic rate. If the plant is grown in a controlled environment with a CO2 concentration of 400 ppm, what is the new rate of photosynthesis?
A. 50% of original rate
B. 75% of original rate
C. 25% of original rate
D. 0% of original rate
Question 3
A species of bird has a beak shape that is well-suited for cracking open seeds. This is an example of which of the following types of adaptations?
A. Mimicry
B. Camouflage
C. Specialized feeding structure
D. Migration pattern
Question 4
A 40-year-old man presents with a 1-year history of progressive shortness of breath and fatigue. His chest X-ray shows a large, homogeneous mass in the left lung. What is the most likely diagnosis?
A. Pulmonary embolism
B. Lung cancer
C. Pneumonia
D. Pulmonary edema
Question 5
A population of 1000 individuals is divided into 10 groups of 100 individuals each. If 20% of the individuals in each group are type A, what is the probability that a randomly selected individual is type A?
A. 0.02
B. 0.04
C. 0.06
D. 0.08
Question 6
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and lowest at pH 5, what is the most likely explanation for this tr\end?
A. The bacteria are more sensitive to acidic environments.
B. The bacteria are more sensitive to basic environments.
C. The bacteria are more sensitive to high temperatures.
D. The bacteria are more sensitive to low temperatures.
Question 7
In a photosynthetic pathway, which of the following is the primary acceptor of electrons in the light-dep\endent reactions?
A. P680
B. P700
C. Pheophytin
D. Plastocyanin
Question 8
A plant is placed in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours light and 12 hours dark. What is the expected effect on the plant's growth?
A. Increased growth rate
B. Decreased growth rate
C. No effect on growth rate
D. Increased leaf size
Question 9
A 30-year-old woman presents with a 6-month history of progressive weakness and fatigue. Her physical examination reveals a palpable goiter. What is the most likely diagnosis?
A. Thyroiditis
B. Thyroid cancer
C. Hyperthyroidism
D. Hypothyroidism
Question 10
A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is permeable to glu\cose, what is the concentration of glu\cose inside the cell after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 11
A 25-year-old male patient presents with symptoms of diarrhea, abdominal pain, and weight loss. Stool examination reveals the presence of blood and mucus. Which of the following microorganisms is most likely responsible for this patient's condition?
A. Escherichia coli
B. Salmonella Typhi
C. Shigella dysenteriae
D. Campylobacter jejuni
Question 12
A 35-year-old woman presents with a 2-year history of progressive dyspnea and fatigue. Her chest X-ray shows a large, homogeneous mass in the right lung. What is the most likely diagnosis?
A. Pulmonary embolism
B. Lung cancer
C. Pneumonia
D. Pulmonary edema
Question 13
In a tropical rainforest e\cosystem, the primary consumers are primarily composed of which of the following groups?
A. Herbivorous insects
B. Fruit-eating bats
C. Fungi-feeding nematodes
D. Carnivorous spiders
Question 14
In the context of tissue organization, what is the primary function of the basement membrane?
A. To provide structural support to the tissue
B. To facilitate the exchange of nutrients and waste products
C. To regulate the movement of cells and molecules
D. To produce extracellular matrix components
Question 15
A 40-year-old woman presents with a 5-year history of progressive shortness of breath. On examination, her oxygen saturation is 85% on room air, and her lung fields are clear. What is the most likely diagnosis?
A. Chronic obstructive pulmonary disease (COPD)
B. Pulmonary embolism
C. Pneumonia
D. Pulmonary hypertension

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