POST UTME UNN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'rr'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 2
Which of the following biomes is characterized by a high level of rainfall and a dense, evergreen forest?
A. Tropical rainforest
B. Temperate rainforest
C. Desert
D. Grassland
Question 3
In a forest e\cosystem, the primary producers are plants that undergo photosynthesis to produce glu\cose and oxygen. Which of the following is a byproduct of the light-dep\endent reactions in photosynthesis?
A. ATP
B. NADPH
C. Oxygen
D. Glu\cose
Question 4
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. No natural selection
Question 5
A diagram shows a simple harmonic motion with a period of 2 seconds. If the amplitude is 5 cm, what is the angular frequency?
A. 1.57 rad/s
B. 3.14 rad/s
C. 5.71 rad/s
D. 10.42 rad/s
Question 6
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
Question 7
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'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 8
In the context of evolutionary theories, what is the primary mechanism driving the adaptation of populations to changing environments?
A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation
Question 9
What is the process by which an organism's genetic information is passed from one generation to the next?
A. Heritability
B. Mutation
C. Genetic drift
D. Natural selection
Question 10
In the context of cell structure, what is the primary function of the mitochondria?
A. To synthesize proteins
B. To store genetic information
C. To generate energy for the cell
D. To regulate cell growth
Question 11
A patient is diagnosed with chronic obstructive pulmonary disease (COPD). The patient's lung function tests show a forced expiratory volume (FEV1) of 1.2 L and a forced vital capacity (FVC) of 3.5 L. What is the patient's FEV1/FVC ratio?
A. 0.34
B. 0.50
C. 0.67
D. 0.80
Question 12
A species of bird has a beak length of 5 cm. If the beak length is normally distributed with a mean of 6 cm and a s\tandard deviation of 1 cm, what is the probability that a randomly selected bird will have a beak length greater than 7 cm?
A. 0.25
B. 0.50
C. 0.75
D. 0.90
Question 13
In a population of 1000 bacteria, 80% are susceptible to a particular antibiotic. If 200 bacteria are exposed to the antibiotic, what is the expected number of resis\tant bacteria?
A. 160
B. 240
C. 320
D. 400
Question 14
A solution of sodium hydroxide (NaOH) is placed in a beaker and left to s\tand for several days. What is the expected outcome?
A. The sodium hydroxide will decompose into sodium and oxygen.
B. The sodium hydroxide will react with the air to form a brown precipitate.
C. The sodium hydroxide will remain unchanged.
D. The sodium hydroxide will dissolve in the beaker.
Question 15
A population of 100 individuals has a frequency of the dominant allele of 0.8 and a frequency of the recessive allele of 0.2. What is the expected frequency of the homozygous dominant genotype?
A. 0.64
B. 0.72
C. 0.8
D. 0.88

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