POST UTME AFE BABALOLA UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The theory of evolution by natural selection was first proposed by which of the following scientists?
A. Charles Darwin
B. Gregor M\endel
C. Jean-Baptiste Lamarck
D. Alfred Russel Wallace
Question 2
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant vegetation. Which of the following is a characteristic of these primary consumers?
A. They have a high metabolic rate
B. They have a low reproductive rate
C. They have a large body size
D. They have a specialized digestive system
Question 3
In a typical xylem vessel, what is the primary function of the lignin component?
A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To prevent the collapse of the vessel
Question 4
In a tropical rainforest, the primary consumers are primarily composed of which of the following groups?
A. Herbivorous insects
B. Fruit-eating bats
C. Omnivorous birds
D. Carnivorous mammals
Question 5
Which of the following types of muscle fibers is responsible for sustained, long-duration contractions?
A. Type I
B. Type IIa
C. Type IIb
D. Type III
Question 6
A river flows through a region with a 50% chance of heavy rainfall. If the river has a 20% chance of overflowing during heavy rainfall, what is the probability that the river will overflow?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 7
A person has a blood urea nitrogen (BUN) level of 20 mg/dL. What is the approximate percentage of nitrogen in the blood?
A. 0.5%
B. 1%
C. 2%
D. 5%
Question 8
The xylem in plants is responsible for transporting which of the following subs\tances?
A. Water and minerals
B. Sugars and amino acids
C. Oxygen and carbon dioxide
D. Hormones and nutrients
Question 9
The xylem tissue in plants is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
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
Question 10
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Water
D. Glu\cose
Question 11
A diagram shows a plant with a root system that has a large number of fine roots. What is the likely function of these fine roots?
A. To absorb water and nutrients from the soil
B. To store food and water
C. To support the plant's structure
D. To produce hormones
Question 12
A patient with a severe case of diabetes mellitus is experiencing symptoms of hyperglycemia. Which of the following hormones is primarily responsible for the breakdown of glycogen to glu\cose in the liver?
A. Glucagon
B. Insulin
C. Adrenaline
D. Growth hormone
Question 13
In a diploid cell, what is the ratio of heterozygous to homozygous genotypes for a particular gene?
A. 1:1
B. 2:1
C. 3:1
D. 4:1
Question 14
A patient with a malfunctioning kidney is unable to excrete excess water. What is the likely effect on the patient's blood osmolality?
A. Increased osmolality
B. Decreased osmolality
C. No change in osmolality
D. Variable osmolality
Question 15
In a xylem vessel, water is transported from the roots to the leaves through a process called
A. osmosis
B. active transport
C. diffusion
D. transpiration pull

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