POST UTME COVENANT UNIVERSITY 2019 Biology | Objective

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Question 1
In a tropical rainforest e\cosystem, what is the primary role of the leafy canopy in the nutrient cycle?
A. To absorb and store nutrients from the soil
Correct B. To release nutrients into the soil through leaf litter
C. To facilitate the movement of nutrients between trophic levels
D. To regulate the amount of sunlight reaching the forest floor

Correct Answer: B

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Question 2
A cell is placed in a solution with a high concentration of glu\cose. Which of the following processes will occur?
A. Osmosis will occur, cau\sing water to enter the cell
Correct B. Active transport will occur, cau\sing glu\cose to enter the cell
C. Passive transport will occur, cau\sing glu\cose to leave the cell
D. The cell will undergo mitosis

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To regulate the movement of materials in and out of the cell
B. To synthesize proteins
Correct C. To store genetic information
D. To provide structural support to the cell

Correct Answer: C

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Question 4
A patient is diagnosed with a bacterial infection. Which of the following antibiotics is most likely to be prescribed?
Correct A. Penicillin
B. Tetracycline
C. Ciprofloxacin
D. Vancomycin

Correct Answer: A

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Question 5
A diagram of the human kidney is shown below. What is the function of the structure labeled 'B'?
Correct A. To filter waste products from the blood
B. To regulate the amount of water in the body
C. To produce hormones
D. To store urine

Correct Answer: A

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Question 6
In a closed e\cosystem, the rate of photosynthesis is directly proportional to the rate of respiration. If the rate of photosynthesis is 10 units per hour, and the rate of respiration is 8 units per hour, what is the net rate of oxygen production per hour?
Correct A. 1 unit/hour
B. 2 units/hour
C. 3 units/hour
D. 4 units/hour

Correct Answer: A

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Question 7
A 2.5 kg rabbit is fed a diet of 200 g of dry matter per day. If the rabbit's metabolic rate is 0.25 W/kg, and the energy density of the dry matter is 18 kJ/g, what is the rabbit's daily energy exp\enditure in kJ?
A. 1000 kJ/day
Correct B. 2000 kJ/day
C. 3000 kJ/day
D. 4000 kJ/day

Correct Answer: B

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Question 8
A plant has a root system that ext\ends 10 cm below the soil surface. If the soil has a water potential of -100 kPa, and the plant's root hairs have a surface area of 0.1 m^2, what is the rate of water uptake by the plant in m^3/s?
A. 1e-9 m^3/s
B. 1e-8 m^3/s
C. 1e-7 m^3/s
Correct D. 1e-6 m^3/s

Correct Answer: D

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Question 9
A 50 g sample of a subs\tance is dissolved in 100 mL of water. If the subs\tance has a molar mass of 200 g/mol, and the concentration of the solution is 0.5 M, what is the number of moles of the subs\tance in the solution?
A. 0.025 mol
Correct B. 0.05 mol
C. 0.075 mol
D. 0.1 mol

Correct Answer: B

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Question 10
A 2.5 kg rabbit is fed a diet of 200 g of dry matter per day. If the rabbit's metabolic rate is 0.25 W/kg, and the energy density of the dry matter is 18 kJ/g, what is the rabbit's daily energy exp\enditure in kJ?
A. 1000 kJ/day
Correct B. 2000 kJ/day
C. 3000 kJ/day
D. 4000 kJ/day

Correct Answer: B

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Question 11
The nervous system is responsible for coordinating the activities of the body through the transmission of signals between neurons. Which of the following is a type of synapse that allows for the release of neurotransmitters into the synaptic cleft?
A. D\endro-d\endritic synapse
Correct B. Axo-d\endritic synapse
C. Axo-axonic synapse
D. Axo-somatic synapse

Correct Answer: B

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Question 12
The xylem is a type of vascular tissue in plants that is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
Correct A. It is composed of dead cells
B. It is composed of living cells
C. It is responsible for transporting sugars from the leaves to the roots
D. It is responsible for transporting water and minerals from the roots to the leaves

Correct Answer: A

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Question 13
The human body is composed of various systems, including the circulatory, respiratory, and nervous systems. Which of the following is a function of the circulatory system?
Correct A. It transports oxygen and nutrients to the cells
B. It transports waste products from the cells
C. It regulates body temperature
D. It produces hormones

Correct Answer: A

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Question 14
The process of evolution is responsible for the diversity of life on Earth. Which of the following is a mechanism of evolution?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. All of the above

Correct Answer: D

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Question 15
The classification of living things is based on their characteristics and evolutionary relationships. Which of the following is a domain of life?
A. Archaea
B. Bacteria
C. Eukarya
Correct D. All of the above

Correct Answer: D

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Question 16
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number and kind of chromosomes as the parent cell, is known as
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication

Correct Answer: A

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Question 17
The process by which a cell becomes specialized in structure and function to perform a specific role in the body is known as
Correct A. Differentiation
B. Mitosis
C. Meiosis
D. Apoptosis

Correct Answer: A

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Question 18
The structure that consists of a group of similar cells that perform a specific function is known as
Correct A. Tissue
B. Organ
C. System
D. Organism

Correct Answer: A

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Question 19
The process by which a cell becomes specialized in structure and function to perform a specific role in the body is known as
Correct A. Differentiation
B. Mitosis
C. Meiosis
D. Apoptosis

Correct Answer: A

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Question 20
The structure that consists of a group of organs that work together to perform a specific function is known as
Correct A. System
B. Organ
C. Tissue
D. Organism

Correct Answer: A

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Question 21
In the process of osmoregulation, what is the primary function of the kidneys in maintaining the balance of electrolytes and water in the body?
A. To regulate blood pressure
Correct B. To remove excess electrolytes and water from the body
C. To maintain acid-base balance
D. To regulate body temperature

Correct Answer: B

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Question 22
What is the primary function of the mitochondria in the process of cellular respiration?
Correct A. To generate ATP
B. To synthesize proteins
C. To store genetic information
D. To regulate cell growth

Correct Answer: A

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Question 23
In the process of digestion, what is the primary function of the enzyme amylase?
A. To break down proteins into amino acids
Correct B. To break down carbohydrates into simple sugars
C. To break down fats into fatty acids
D. To synthesize proteins

Correct Answer: B

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Question 24
What is the primary function of the xylem in the transport of water and minerals in plants?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and amino acids from the leaves to the roots
C. To regulate gas exchange between the leaves and the atmosphere
D. To synthesize chlorophyll

Correct Answer: A

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Question 25
In the process of osmoregulation, what is the primary function of the kidneys in maintaining the balance of electrolytes and water in the body?
A. To regulate blood pressure
Correct B. To remove excess electrolytes and water from the body
C. To maintain acid-base balance
D. To regulate body temperature

Correct Answer: B

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