Practice post utme ui biology 2025 Past Questions

Question 1

In a typical e\cosystem, what is the primary role of decomposers?

A. To produce organic compounds

B. To break down dead organisms

C. To produce oxygen

D. To absorb nutrients

Question 2

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?

A. 0.04

B. 0.08

C. 0.16

D. 0.32

Question 3

A geneticist is studying the inheri\tance of a particular trait in a population. If the trait is determined by a \single gene with two alleles, what is the probability that a child will inherit the recessive allele if the parents are both heterozygous?

A. 25%

B. 50%

C. 75%

D. 100%

Question 4

A solution of glu\cose (C6H12O6) is prepared by dissolving 20g of glu\cose in 100ml of water. What is the concentration of the solution in g/L?

A. 100

B. 200

C. 300

D. 400

Question 5

A population of rabbits is growing according to the \logistic growth model: \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the initial population size is 100 and the carrying capacity is 1000, what is the population size at time t = 5?

A. 500

B. 750

C. 900

D. 1000

Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

A. 0.36

B. 0.64

C. 0.48

D. 0.72

Question 7

A diagram of a plant's root system is shown below. What is the function of the structure labeled 'A'?

A. absorbing water and nutrients from the soil

B. producing hormones to regulate plant growth

C. supporting the plant's structure and anchoring it in the soil

D. conducting water and minerals from the roots to the rest of the plant

Question 8

A 25-year-old woman is experiencing difficulty conceiving a child. After undergoing a series of medical tests, she is diagnosed with polycystic ovary syndrome (PCOS). Which of the following reproductive hormones is most likely imbalanced in this woman?

A. Estrogen

B. Progesterone

C. Testosterone

D. Insulin

Question 9

A researcher is studying the effects of light on plant growth. She sets up an experiment with three different light intensities: low, medium, and high. Which of the following statistical analyses would be most appropriate for this experiment?

A. ANOVA

B. Regression analysis

C. t-test

D. Chi-square test

Question 10

A diagram of the human eye is shown below. What is the function of the part labeled 'C'?

A. To focus light onto the retina

B. To re\fract light entering the eye

C. To detect light intensity

D. To regulate pupil size

Question 11

In a plant cell, what is the primary function of the vacuole?

A. To store water and nutrients

B. To synthesize proteins

C. To regulate pH levels

D. To maintain cell shape

Question 12

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

A. 0.16

B. 0.36

C. 0.64

D. 0.84

Question 13

A 10-year-old boy is diagnosed with a rare genetic disorder that affects his ability to synthesize the amino acid phenylalanine. Which of the following enzymes is most likely deficient in this boy?

A. Phenylalanine hydroxylase

B. Tyro\sine aminotransferase

C. Dihydropteridine reductase

D. GTP cyclohydrolase

Question 14

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' for red eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?

A. 0.8

B. 0.6

C. 0.4

D. 0.2

Question 15

The diagram below shows a cross-section of the human eye. Which part of the eye is responsible for detecting light?

A. Cornea

B. Iris

C. Retina

D. Lens

POST UTME UI 2025 Biology | Objective

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