POST UTME MOUNTAIN TOP UNIVERSITY 2017 Biology | Objective

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Question 1
The process of natural selection acting on a population of organisms with varying traits leads to the evolution of a new species. Which of the following is a key component of this process?
A. Genetic drift
B. Mutation
C. Gene flow
Correct D. Adaptation

Correct Answer: D

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Question 2
In the human body, the excretory system is responsible for removing waste products and excess subs\tances. Which of the following organs plays a crucial role in this process?
Correct A. Kidneys
B. Liver
C. Pancreas
D. Skin

Correct Answer: A

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Question 3
A diagram of the human circulatory system is shown below.
A. The heart pumps blood to the lungs.
Correct B. The heart pumps blood to the body.
C. The heart pumps blood to the liver.
D. The heart pumps blood to the kidneys.

Correct Answer: B

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Question 4
In the classification of living things, which of the following kingdoms is characterized by the presence of cell walls made of cellulose?
A. Animalia
Correct B. Plantae
C. Fungi
D. Protista

Correct Answer: B

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Question 5
The process of osmoregulation in animals involves the regulation of the balance of water and solutes in the body. Which of the following organs plays a crucial role in this process?
Correct A. Kidneys
B. Liver
C. Pancreas
D. Skin

Correct Answer: A

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Question 6
In a tropical rainforest e\cosystem, the primary consumers are primarily composed of which of the following?
A. Herbivorous insects
B. Fungi and bacteria
Correct C. Small mammals and birds
D. Decomposers

Correct Answer: C

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Question 7
A patient has been diagnosed with a bacterial infection caused by Staphylococcus aureus. Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
Correct D. Vancomycin

Correct Answer: D

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Question 8
In a plant, the xylem is responsible for transporting which of the following subs\tances?
Correct A. Water and minerals
B. Sugars and amino acids
C. Hormones and proteins
D. Waste products

Correct Answer: A

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Question 9
Asexual reproduction in plants can occur through which of the following methods?
A. Budding
B. Fragmentation
C. Runners
Correct D. All of the above

Correct Answer: D

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Question 10
In a population of rabbits, the growth rate is affected by which of the following factors?
A. Availability of food
B. Predation by foxes
C. Disease
Correct D. All of the above

Correct Answer: D

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Question 11
In the context of blood transport systems, what is the primary function of the erythrocytes?
A. To regulate blood pH
Correct B. To transport oxygen and carbon dioxide
C. To filter waste products from the blood
D. To maintain blood pressure

Correct Answer: B

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Question 12
Asexual reproduction in plants can occur through the formation of
A. Seeds
B. Spores
C. Buds
Correct D. Rhizomes

Correct Answer: D

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Question 13
The process of gas exchange in the lungs involves the diffusion of
Correct A. Oxygen and carbon dioxide
B. Nitrogen and oxygen
C. Carbon dioxide and water vapor
D. Oxygen and nitrogen

Correct Answer: A

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Question 14
The xylem tissue in plants is responsible for the transport of
Correct A. Water and minerals
B. Sugars and amino acids
C. Waste products and excess ions
D. Hormones and signaling molecules

Correct Answer: A

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Question 15
The process of cellular respiration involves the breakdown of glu\cose to produce
Correct A. ATP and water
B. Carbon dioxide and water
C. Oxygen and glu\cose
D. Nitrogen and oxygen

Correct Answer: A

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Question 16
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial membrane
C. To reduce NAD+ to NADH
D. To produce water as a byproduct

Correct Answer: B

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Question 17
A 25-year-old male patient presents with symptoms of fatigue, weakness, and shortness of breath. His complete blood count (CBC) reveals a hemoglobin level of 7.5 g/dL. Which of the following is the most likely diagnosis?
Correct A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Sickle cell anemia

Correct Answer: A

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Question 18
A researcher is studying the effects of light intensity on photosynthesis in a controlled environment. The researcher measures the rate of CO2 uptake and finds that it increases with increa\sing light intensity. However, the rate of O2 production remains cons\tant. What can be concluded about the light-dep\endent reactions?
A. The light-dep\endent reactions are the rate-limiting step in photosynthesis
B. The light-dep\endent reactions are not affected by light intensity
C. The light-dep\endent reactions are responsible for the increase in CO2 uptake
Correct D. The light-dep\endent reactions are responsible for the production of ATP and NADPH

Correct Answer: D

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Question 19
A 35-year-old female patient presents with symptoms of abdominal pain, diarrhea, and weight loss. Her stool culture reveals the presence of Giardia lamblia. Which of the following is the most likely diagnosis?
Correct A. Giardiasis
B. Amoebiasis
C. Cryptosporidiosis
D. Cysticer\cosis

Correct Answer: A

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Question 20
A researcher is studying the effects of temperature on the growth rate of E. coli in a controlled environment. The researcher measures the growth rate and finds that it increases with increa\sing temperature up to a certain point, after which it decreases. What can be concluded about the growth rate of E. coli?
A. The growth rate of E. coli is directly proportional to temperature
B. The growth rate of E. coli is inversely proportional to temperature
Correct C. The growth rate of E. coli has an optimal temperature for growth
D. The growth rate of E. coli is not affected by temperature

Correct Answer: C

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Question 21
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the production of a certain enzyme. If 20% of the population are homozygous recessive, what is the frequency of the dominant allele?
Correct A. 0.3
B. 0.4
C. 0.5
D. 0.6

Correct Answer: A

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Question 22
A researcher studying the eco\logy of a forest e\cosystem discovers that the population of a certain species of tree is declining due to a fungal disease. The disease is caused by a fungus that infects the tree's roots and prevents it from absorbing water and nutrients. Which of the following is a likely consequence of this disease on the forest e\cosystem?
A. The population of the tree species will increase due to reduced competition for resources.
Correct B. The population of the tree species will decrease due to reduced competition for resources.
C. The population of the tree species will remain unchanged due to the disease.
D. The population of the tree species will increase due to the disease.

Correct Answer: B

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Question 23
A bio\logist is studying the reproductive habits of a species of bird. The bird lays 2 eggs per clutch, and the sex of the eggs is determined by the temperature of the incubation environment. If the temperature is between 30°C and 32°C, the eggs will hatch as males. If the temperature is between 34°C and 36°C, the eggs will hatch as females. What is the probability that a clutch of 2 eggs will hatch as 2 males?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 24
A researcher is studying the effects of pollution on a population of fish. The researcher collects 100 fish from a polluted area and 100 fish from a non-polluted area. The researcher then measures the length of each fish and calculates the mean length of the fish in each area. Which of the following is a likely conclusion based on the data?
A. The mean length of the fish in the polluted area is greater than the mean length of the fish in the non-polluted area.
Correct B. The mean length of the fish in the non-polluted area is greater than the mean length of the fish in the polluted area.
C. The mean length of the fish in the polluted area is equal to the mean length of the fish in the non-polluted area.
D. The data is insufficient to draw a conclusion.

Correct Answer: B

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Question 25
A bio\logist is studying the structure of a cell. The cell has a nucleus, mitochondria, and a cell membrane. Which of the following is a function of the mitochondria?
A. To synthesize proteins
B. To store genetic information
Correct C. To generate energy for the cell
D. To regulate the cell's environment

Correct Answer: C

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