POST UTME PAN-ATLANTIC UNIVERSITY 2021 Biology | Objective

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Question 1 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, how many individuals are expected to be homozygous recessive?
Correct A. 200
B. 400
C. 600
D. 800

Correct Answer: A

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Question 2 View Details
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
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 3 View Details
A diagram of the human circulatory system is shown below. Which of the following structures is responsible for the regulation of blood pressure?
Correct A. Heart
B. Artery
C. Vein
D. Capillary

Correct Answer: A

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Question 4 View Details
In asexual reproduction, what is the term for the process by which a cell divides to produce two daughter cells?
A. Mitosis
B. Meiosis
Correct C. Binary Fission
D. Budding

Correct Answer: C

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Question 5 View Details
A diagram of the water cycle is shown below. Which of the following processes is responsible for the formation of clouds?
A. Evaporation
Correct B. Condensation
C. Precipitation
D. Runoff

Correct Answer: B

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Question 6 View Details
In a population of E. coli bacteria, the average generation time is 30 minutes. If the initial population size is 10^6 cells, calculate the population size after 4 hours, assuming exponential growth with a growth rate of 0.5 per hour.
A. 2.5 x 10^8
Correct B. 1.0 x 10^9
C. 5.0 x 10^8
D. 1.0 x 10^7

Correct Answer: B

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Question 7 View Details
A diagram of the human eye is shown below. Identify the part labeled 'A'.
Correct A. Cornea
B. Iris
C. Lens
D. Retina

Correct Answer: A

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Question 8 View Details
In asexual reproduction, the offspring are genetically identical to the parent. Which of the following organisms reproduces asexually?
Correct A. Bread mold
B. Fruit fly
C. Human
D. Bacteria

Correct Answer: A

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Question 9 View Details
A diagram of the human excretory system is shown below. Identify the part labeled 'B'.
A. Liver
Correct B. Kidney
C. Pancreas
D. Spleen

Correct Answer: B

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Question 10 View Details
In the classification of living things, which of the following is a characteristic of kingdom Animalia?
Correct A. Multicellular and eukaryotic
B. Multicellular and prokaryotic
C. Unicellular and eukaryotic
D. Unicellular and prokaryotic

Correct Answer: A

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Question 11 View Details
In the context of hormonal coordination, what is the primary function of the hypothalamus in regulating body temperature?
A. To produce heat-shock proteins
B. To regulate the hypothalamic-pituitary-adrenal axis
C. To stimulate the release of antidiuretic hormone
Correct D. To modulate the set-point for body temperature

Correct Answer: D

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Question 12 View Details
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this transport occurs?
Correct A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

Correct Answer: A

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Question 13 View Details
In the process of excretion, what is the primary function of the kidneys in removing waste products from the blood?
Correct A. To filter the blood u\sing the glomeruli
B. To regulate the concentration of ions in the blood
C. To produce antidiuretic hormone
D. To stimulate the release of aldosterone

Correct Answer: A

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Question 14 View Details
A cell's plasma membrane is selectively permeable, allowing certain subs\tances to pass through while restricting others. What is the primary mechanism by which this selectivity is achieved?
A. Diffusion
B. Osmosis
C. Active transport
Correct D. Passive transport

Correct Answer: D

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Question 15 View Details
In the context of nutrition, what is the primary function of chlorophyll in photosynthesis?
A. To absorb light energy
Correct B. To convert light energy into chemical energy
C. To produce glu\cose and oxygen
D. To regulate stomatal opening

Correct Answer: B

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Question 16 View Details
In a population of 1000 individuals, 60% have the dominant allele for brown eye color (B) and 40% have the recessive allele (b). If two individuals with brown eye color are randomly selected for a study, what is the probability that they are both homozygous dominant (BB) for the brown eye color trait?
Correct A. 0.36
B. 0.64
C. 0.36
D. 0.64

Correct Answer: A

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Question 17 View Details
A researcher studying the eco\logy of a freshwater lake discovers that the lake's water level is decrea\sing at a rate of 0.5 meters per day. If the lake's water level is currently at 10 meters, how many days will it take for the water level to drop to 5 meters?
A. 10 days
Correct B. 20 days
C. 30 days
D. 40 days

Correct Answer: B

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Question 18 View Details
A plant has a mutation in its Xylem tissue that causes it to produce more xylem sap than normal. If the plant's normal xylem sap production rate is 10 liters per hour, and the mutated plant produces 20 liters per hour, what is the ratio of the mutated plant's xylem sap production rate to the normal plant's xylem sap production rate?
A. 1:1
Correct B. 2:1
C. 1:2
D. 3:1

Correct Answer: B

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Question 19 View Details
A researcher studying the sense organs of a species of fish discovers that the fish has a highly developed sense of smell. If the fish's sense of smell is 10 times more sensitive than that of a human, and a human can detect a concentration of 1 part per million (ppm) of a particular chemical, what concentration of the chemical would the fish be able to detect?
Correct A. 0.1 ppm
B. 1 ppm
C. 10 ppm
D. 100 ppm

Correct Answer: A

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Question 20 View Details
A population of 1000 individuals has a genetic variation in which 60% have the dominant allele for a particular trait (B) and 40% have the recessive allele (b). If two individuals are randomly selected for a study, what is the probability that they are both homozygous dominant (BB) for the trait?
Correct A. 0.36
B. 0.64
C. 0.36
D. 0.64

Correct Answer: A

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Question 21 View Details
In the context of the classification of living things, what is the primary function of the kingdom level?
Correct A. To group organisms based on their cell structure
B. To group organisms based on their genetic makeup
C. To group organisms based on their body structure
D. To group organisms based on their habitat

Correct Answer: A

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Question 22 View Details
A plant's xylem is responsible for transporting
Correct A. water and minerals from the roots to the leaves
B. sugars and amino acids from the leaves to the roots
C. oxygen and carbon dioxide from the roots to the leaves
D. nutrients and hormones from the leaves to the roots

Correct Answer: A

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Question 23 View Details
In genetics, what is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. mutation
B. gene expression
Correct C. heredity
D. natural selection

Correct Answer: C

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Question 24 View Details
The process of respiration in plants involves the breakdown of
Correct A. glu\cose and oxygen to produce carbon dioxide and water
B. carbon dioxide and water to produce glu\cose and oxygen
C. glu\cose and water to produce carbon dioxide and oxygen
D. carbon dioxide and oxygen to produce glu\cose and water

Correct Answer: A

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Question 25 View Details
The nervous system is responsible for
A. controlling the body's movements and maintaining homeostasis
B. regulating the body's temperature and maintaining blood pressure
Correct C. transmitting signals from sensory receptors to the brain
D. controlling the body's involuntary functions, such as digestion and respiration

Correct Answer: C

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