POST UTME GREENFIELD UNIVERSITY 2024 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of temperature on the growth of a certain type of plant. The graph below shows the relationship between temperature and plant growth.
A. The plant grows best at a temperature of 20°C.
B. The plant grows best at a temperature of 25°C.
C. The plant grows best at a temperature of 30°C.
D. The plant grows best at a temperature of 35°C.
Question 2
A 50-year-old woman has a family history of breast cancer. Her mother and sister both had breast cancer at the age of 40. What is the probability that she will develop breast cancer by the age of 50?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 3
In a photosynthetic pathway, the light-dep\endent reactions occur in the
A. Thylakoid membrane
B. Stroma
C. Chloroplast envelope
D. Mitochondrial matrix
Question 4
In a population of 1000 individuals, 80% are heterozygous for the gene controlling the flower color trait. If 20% of the population are homozygous recessive, what is the probability that a randomly selected individual will be homozygous dominant?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 5
A 2.5 L solution of 0.5 M NaCl is diluted to 5 L. What is the new concentration of NaCl?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate the concentration of ions in the blood
B. To excrete excess water and maintain blood pressure
C. To reabsorb glu\cose and amino acids from the filtrate
D. To produce antidiuretic hormone (ADH)
Question 7
A 50 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. If the mass of the solution is 150 g, what is the mass of KCl in the mixture?
A. 20 g
B. 30 g
C. 40 g
D. 50 g
Question 8
In a plant's xylem, what is the primary function of the tracheids?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To provide structural support to the plant
D. To regulate the plant's water potential
Question 9
A diagram of the nitrogen cycle is shown below. Which of the following processes is represented by the arrow pointing from the 'ammonia' box to the 'nitrite' box?
A. \( \text{NH}_3 \rightarrow \text{NO}_2^- \)
B. \( \text{NH}_3 \rightarrow \text{NO}_3^- \)
C. \( \text{NO}_2^- \rightarrow \text{NO}_3^- \)
D. \( \text{NO}_3^- \rightarrow \text{NH}_3 \)
Question 10
A microorganism is isolated from a patient's blood sample and identified as Staphylococcus aureus. If the patient is allergic to penicillin, what is the recomm\ended antibiotic treatment?
A. Vancomycin
B. Ciprofloxacin
C. Gentamicin
D. Tetracycline
Question 11
A 50 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. If the mass of the solution is 150 g, what is the mass of KCl in the mixture?
A. 20 g
B. 30 g
C. 40 g
D. 50 g
Question 12
The diagram below shows a cross-section of a plant root. Which of the following tissues is responsible for the production of ethylene gas?
A. Cortex
B. Endodermis
C. Pericycle
D. Xylem
Question 13
A 2.5-liter solution of 0.5 M NaCl is diluted by adding 1 liter of water. What is the new concentration of NaCl in the solution?
A. 0.25 M
B. 0.33 M
C. 0.5 M
D. 0.67 M
Question 14
A genetic cross between two true-breeding lines of pea plants results in a 3:1 ratio of green seeds to yellow seeds. What is the genotype of the parents?
A. Bb x Bb
B. Bb x bb
C. BB x bb
D. Bb x BB
Question 15
A diagram of a human respiratory system is shown below. Identify the part labeled 'B'?
A. Trachea
B. Lungs
C. Diaphragm
D. Bronchi

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