POST UTME UNILORIN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A river flows through a valley and eventually empties into a lake. What is the primary mechanism by which the river's water is purified?
A. Photosynthesis
B. Respiration
C. Filtration
D. Oxidation
Question 2
A 50.0-mL sample of a solution containing 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the resulting solution after the addition of 50.0 mL of NaOH?
A. 7.00
B. 8.00
C. 9.00
D. 10.00
Question 3
In the context of eco\logical succession, what is the term for the process by which a community of organisms becomes established in a new area?
A. Primary succession
B. Secondary succession
C. Eco\logical drift
D. Species invasion
Question 4
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 photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Water
D. Nitrogen
Question 5
A plant has a high concentration of chloroplasts in its leaves. What is the primary function of these chloroplasts?
A. To regulate the plant's temperature
B. To store water
C. To exchange gases
D. To synthesize glu\cose
Question 6
The process of photosynthesis occurs in specialized organelles called chloroplasts, which are present in plant cells. What is the primary function of chlorophyll in photosynthesis?
A. To absorb light energy from the sun
B. To convert light energy into chemical energy
C. To transport water and minerals from the roots to the leaves
D. To regulate the opening and clo\sing of stomata
Question 7
The process of meiosis in eukaryotic cells involves the reduction of the number of chromosomes in the reproductive cells. Which of the following stages of meiosis is responsible for the separation of homo\logous chromosomes?
A. Meiosis I
B. Meiosis II
C. Prophase I
D. Metaphase I
Question 8
A 10.0-mL sample of a solution containing 0.50 M NaCl is diluted to 50.0 mL. What is the concentration of the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.10 M
D. 0.20 M
Question 9
A 10.0-mL sample of a solution containing 0.50 M CaCl2 is diluted to 50.0 mL. What is the concentration of the resulting solution?
A. 0.01 M
B. 0.05 M
C. 0.10 M
D. 0.20 M
Question 10
A plant has a high concentration of stomata on its leaves. What is the primary function of these stomata?
A. To regulate the plant's temperature
B. To store water
C. To exchange gases
D. To protect the plant from excessive light
Question 11
The theory of evolution by natural selection was first proposed by Charles Darwin in his book 'On the Origin of Species'. Which of the following is a key component of this theory?
A. Gradualism
B. Punctuated equilibrium
C. Natural selection
D. Gene flow
Question 12
The concept of eco\logical niches refers to the specific role or position that an organism occupies within its environment. Which of the following is an example of a competitive exclusion principle?
A. The presence of two species with identical eco\logical niches in the same environment
B. The presence of two species with different eco\logical niches in the same environment
C. The presence of a \single species with a unique eco\logical niche in an environment
D. The absence of a species in an environment due to the presence of a competing species
Question 13
The diagram below shows a cross-section of a plant root. Which of the following tissues is responsible for the absorption of water and minerals from the soil?
A. Cortex
B. Endodermis
C. Pericycle
D. Xylem
Question 14
In a photosynthetic pathway, which of the following pigments is primarily responsible for absorbing light in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Phycobiliproteins
Question 15
The process of meiosis in eukaryotic cells involves the reduction of the chromosome number by half. Which of the following stages of meiosis is responsible for this reduction?
A. Prophase I
B. Metaphase I
C. Anaphase I
D. Telophase II

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