POST UTME DELSU 2018 Biology | Objective

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Question 1 View Details
In the context of cell division, what is the primary function of the spindle fibers during anaphase?
Correct A. To separate the sister chromatids
B. To align the chromosomes at the metaphase plate
C. To form the nuclear envelope around the daughter cells
D. To condense the chromatin

Correct Answer: A

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Question 2 View Details
A population of Drosophila melanogaster is being studied for its genetic variation. Which of the following types of genetic variation would be most difficult to detect u\sing morpho\logical characteristics?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Genetic variation due to allelic differences

Correct Answer: D

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Question 3 View Details
A diagram of the human kidney is shown below. What is the primary function of the renal corpuscle in the nephron?
Correct A. To filter the blood
B. To regulate blood pressure
C. To produce urine
D. To absorb nutrients

Correct Answer: A

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Question 4 View Details
A diagram of the human heart is shown below. What is the primary function of the atrioventricular (AV) node?
Correct A. To regulate heart rate
B. To pump blood to the lungs
C. To pump blood to the body
D. To regulate blood pressure

Correct Answer: A

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Question 5 View Details
A diagram of the human eye is shown below. What is the primary function of the lens?
Correct A. To focus light on the retina
B. To regulate pupil size
C. To produce tears
D. To detect light

Correct Answer: A

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Question 6 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
Correct A. 0.8
B. 0.6
C. 0.4
D. 0.2

Correct Answer: A

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Question 7 View Details
A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. If 1.5 mol of the gas is added to the flask, what is the new pressure?
A. 1.5 atm
Correct B. 2.0 atm
C. 2.5 atm
D. 3.0 atm

Correct Answer: B

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Question 8 View Details
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'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 9 View Details
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 10 View Details
A 5.0 g sample of a compound is analyzed by combustion analysis. The sample is found to contain 3.2 g of carbon and 1.8 g of hydrogen. What is the empirical formula of the compound?
Correct A. CH2O
B. C2H4O
C. C3H6O
D. C4H8O

Correct Answer: A

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Question 11 View Details
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. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 12 View Details
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1.0

Correct Answer: A

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Question 13 View Details
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Mitochondria
B. Nucleus
C. Cell wall
D. Plastid

Correct Answer: A

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Question 14 View Details
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
Correct B. Iris
C. Retina
D. Lens

Correct Answer: B

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Question 15 View Details
A diagram of a human brain is shown below. Identify the part labeled 'C'.
A. Cerebrum
B. Cerebellum
Correct C. Brainstem
D. Spinal cord

Correct Answer: C

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Question 16 View Details
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on genetic variation?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Differential reproduction

Correct Answer: D

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Question 17 View Details
A population of fruit flies is exposed to a toxic subs\tance that kills 20% of the population. What is the expected change in the population's allele frequency for the gene that codes for resis\tance to the toxin?
A. Increase
Correct B. Decrease
C. No change
D. Stable

Correct Answer: B

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Question 18 View Details
Asexual reproduction in bacteria involves the process of
Correct A. Binary fission
B. Mitosis
C. Meiosis
D. Budding

Correct Answer: A

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Question 19 View Details
The process of excretion in humans involves the removal of waste products from the body through the
Correct A. Kidneys
B. Liver
C. Lungs
D. Skin

Correct Answer: A

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Question 20 View Details
Photosynthesis in plants involves the conversion of light energy into chemical energy in the form of
Correct A. Glu\cose
B. Starch
C. Protein
D. Fat

Correct Answer: A

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Question 21 View Details
The process of meiosis results in the production of four haploid daughter cells from a \single diploid parent cell. Which of the following is a characteristic of the daughter cells produced during meiosis?
A. They have the same number of chromosomes as the parent cell
Correct B. They have half the number of chromosomes as the parent cell
C. They have a mix of paternal and maternal chromosomes
D. They have a different ploidy level than the parent cell

Correct Answer: B

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Question 22 View Details
A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?
A. The trachea
B. The diaphragm
Correct C. The lungs
D. The bronchi

Correct Answer: C

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Question 23 View Details
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation in the absence of certain factors. Which of the following is a factor that can cause the frequency of alleles to change?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Natural selection

Correct Answer: D

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Question 24 View Details
A diagram of the human digestive system is shown below. Which of the following structures is responsible for the absorption of nutrients?
A. The stomach
Correct B. The small intestine
C. The pancreas
D. The liver

Correct Answer: B

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Question 25 View Details
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following is a characteristic of the daughter cells produced during mitosis?
Correct A. They have the same number of chromosomes as the parent cell
B. They have half the number of chromosomes as the parent cell
C. They have a mix of paternal and maternal chromosomes
D. They have a different ploidy level than the parent cell

Correct Answer: A

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