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POST UTME BABCOCK UNIVERSITY 2022 Biology | Objective

Are you preparing for POST UTME BABCOCK UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1

In a diploid cell, what is the total number of alleles for a \single gene locus if the genotype is AaBb?

A. 4

Correct B. 6

C. 8

D. 10

Correct Answer: B

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Question 2

A plant grows in a controlled environment with a cons\tant temperature of 25°C and a relative humidity of 60%. What is the expected rate of transpiration?

A. 0.05 g H2O/g dry matter/h

Correct B. 0.10 g H2O/g dry matter/h

C. 0.15 g H2O/g dry matter/h

D. 0.20 g H2O/g dry matter/h

Correct Answer: B

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Question 3

A 2.5 L solution of 0.1 M glu\cose is diluted to a total volume of 5 L. What is the new concentration of glu\cose?

A. 0.02 M

Correct B. 0.05 M

C. 0.10 M

D. 0.20 M

Correct Answer: B

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Question 4

A 50 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. What is the molarity of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 5

A 10 mL sample of a 0.1 M solution of HCl is added to a 50 mL sample of a 0.2 M solution of NaOH. What is the resulting pH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

In a population of E. coli bacteria, the average generation time is 30 minutes. If the population is doubling every 10 minutes, what is the growth rate cons\tant (r) in units of 1/min?

A. 0.0693

Correct B. 0.693

C. 6.93

D. 69.3

Correct Answer: B

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Question 7

A 5% glu\cose solution is prepared by dissolving 5g of glu\cose in 95g of water. What is the molarity of the solution?

Correct A. 0.0309

B. 0.309

C. 3.09

D. 30.9

Correct Answer: A

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Question 8

A plant with the genotype AaBb is crossed with a plant with the genotype AaBb. What is the probability that the offspring will have the genotype AaBb?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1

Correct Answer: A

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Question 9

A 2.0 L flask contains 1.0 M HCl. If 0.5 L of 2.0 M NaOH is added to the flask, what is the concentration of the resulting solution?

A. 0.4

Correct B. 0.8

C. 1.2

D. 1.6

Correct Answer: B

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Question 10

A 10% solution of NaOH is prepared by dissolving 10g of NaOH in 90g of water. What is the molarity of the solution?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1

Correct Answer: A

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Question 11

In the xylem transport system, what is the primary function of the xylem parenchyma cells?

A. To produce xylem sap

Correct B. To store water and minerals

C. To facilitate the transport of xylem sap

D. To regulate the rate of xylem sap flow

Correct Answer: B

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Question 12

Which of the following is an example of a symbiotic relationship in the e\cosystem?

A. Predator-prey relationship

Correct B. Mutualism between clownfish and sea anemone

C. Competition between two species

D. Commensalism between two species

Correct Answer: B

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Question 13

What is the primary function of the mitochondria in a cell?

A. To produce ATP through photosynthesis

Correct B. To produce ATP through cellular respiration

C. To synthesize proteins

D. To store genetic information

Correct Answer: B

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Question 14

What is the term for the process by which plants convert light energy into chemical energy?

A. Respiration

Correct B. Photosynthesis

C. Decomposition

D. Fermentation

Correct Answer: B

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Question 15

What is the primary function of the root hairs in a plant?

Correct A. To absorb water and minerals from the soil

B. To produce xylem sap

C. To store water and minerals

D. To regulate the rate of xylem sap flow

Correct Answer: A

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Question 16

In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual with the highest frequency in this population?

Correct A. Genotype: AA, Phenotype: Type A blood

B. Genotype: AO, Phenotype: Type A blood

C. Genotype: OO, Phenotype: Type O blood

D. Genotype: AO, Phenotype: Type B blood

Correct Answer: A

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Question 17

A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1.0

Correct Answer: A

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Question 18

A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the pH of the resulting solution?

A. 1.0

Correct B. 7.0

C. 10.0

D. 14.0

Correct Answer: B

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Question 19

A 5.0 g sample of a subs\tance is dissolved in 100.0 mL of water. The resulting solution has a concentration of 0.5 M. What is the molar mass of the subs\tance?

A. 10.0 g/mol

B. 20.0 g/mol

Correct C. 50.0 g/mol

D. 100.0 g/mol

Correct Answer: C

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Question 20

A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. What is the probability that a randomly selected individual will have a height greater than 180 cm?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 21

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'?

Correct A. 0.48

B. 0.36

C. 0.64

D. 0.52

Correct Answer: A

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Question 22

A 2-year-old child is brought to the hospital with symptoms of respiratory distress. The child's oxygen saturation is 88% on room air. Which of the following is the most likely diagnosis?

Correct A. Congenital diaphragmatic hernia

B. Pulmonary atresia

C. Tracheoesophageal fistula

D. Esophageal atresia

Correct Answer: A

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Question 23

A 35-year-old woman presents with primary amenorrhea. Her karyotype is 46,XX. Which of the following is the most likely diagnosis?

A. Turner syndrome

B. Androgen insensitivity syndrome

Correct C. Mayer-Roki\tansky-Küster-Hauser syndrome

D. Swyer syndrome

Correct Answer: C

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Question 24

A 50-year-old man presents with a 10-year history of hypertension. His blood pressure is 180/100 mmHg. Which of the following is the most likely diagnosis?

A. Primary aldosteronism

Correct B. Renal artery stenosis

C. Coarctation of the aorta

D. Pheochromocytoma

Correct Answer: B

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Question 25

A 25-year-old woman presents with a 2-year history of infertility. Her menstrual cycles are regular, and her karyotype is 46,XX. Which of the following is the most likely diagnosis?

Correct A. Polycystic ovary syndrome

B. Endometriosis

C. Tubal ligation

D. Premature ovarian failure

Correct Answer: A

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