POST UTME BELLS UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The human eye is an example of a complex organ that has evolved to perform a specific function. Which of the following is a key component of the human eye?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 2
The bacterium Escherichia coli (E. coli) is a common inhabi\tant of the human gut. What is the primary function of the flagella in E. coli?
A. To produce ATP
B. To move the bacterium through the gut
C. To synthesize proteins
D. To degrade carbohydrates
Question 3
The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 4
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 responsible for transporting sugars from the leaves to the roots
C. It has a high concentration of starch grains
D. It is composed of living cells
Question 5
The process of natural selection can be described as a mechanism that favors the survival and reproduction of individuals with traits that are better suited to their environment. Which of the following is a key consequence of this process?
A. Increased genetic variation within a population
B. Reduced genetic variation within a population
C. No change in genetic variation within a population
D. Increased genetic variation between populations
Question 6
In the xylem transport system, what is the primary function of the tracheids?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To provide structural support to the plant
D. To regulate the rate of transpiration
Question 7
In a photosynthetic pathway, which enzyme catalyzes the conversion of ribulose-1,5-bisphosphate to 3-phosphoglycerate?
A. Ribulose-5-phosphate kinase
B. Ribulose-1,5-bisphosphate carboxylase/oxygenase
C. Phosphoglycerate kinase
D. Phosphoglycerate mutase
Question 8
A 2.0 L flask contains 0.5 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 3.0 atm
D. 4.0 atm
Question 9
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. To regulate body temperature
B. To control hunger and thirst
C. To stimulate the release of hormones
D. To regulate sleep and wakefulness
Question 10
The e\cosystem of a coral reef is characterized by a diverse array of species. What is the primary source of energy for this e\cosystem?
A. Photosynthesis
B. Decomposition
C. Detritivory
D. Herbivory
Question 11
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. What is the main mechanism by which evolution occurs?
A. Genetic drift
B. Mutation
C. Gene flow
D. Natural selection
Question 12
In the process of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To generate ATP through oxidative phosphorylation
C. To generate NADH and FADH2
D. To generate ATP through glycolysis
Question 13
A diagram of the human brain is shown below. Which part of the brain is responsible for proces\sing visual information?
A. Cerebellum
B. Cerebrum
C. Brainstem
D. Spinal Cord
Question 14
A plant cell has a vacuole that contains 0.5 M sucrose solution. If the cell membrane is permeable to water but not to sucrose, what will happen to the cell?
A. The cell will shrink.
B. The cell will swell.
C. The cell will remain unchanged.
D. The cell will burst.
Question 15
The sense organ responsible for detecting changes in light intensity is the?
A. Eye
B. Ear
C. Nose
D. Tongue

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