Practice post utme lead city university biology 2018 Past Questions

Question 1

In a tropical rainforest, the presence of a large number of epiphytes is an example of a(n) _______ relationship between the epiphytes and their host plants.

Correct A. mutualism

B. commensalism

C. parasitism

D. competition

Correct Answer: A

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Question 2

The process by which plants convert light energy into chemical energy is called _______

Correct A. photosynthesis

B. respiration

C. transpiration

D. translocation

Correct Answer: A

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Question 3

The diagram below shows a cross-section of a plant root. Which part of the root is responsible for the uptake of water and minerals from the soil?

A. A

Correct B. B

C. C

D. D

Correct Answer: B

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Question 4

The cell cycle consists of two main phases: the _______ phase and the _______ phase.

Correct A. interphase, mitosis

B. mitosis, interphase

C. prophase, metaphase

D. anaphase, telophase

Correct Answer: A

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Question 5

The process by which an organism's genetic information is passed from one generation to the next is called _______

Correct A. heredity

B. variation

C. mutation

D. genetics

Correct Answer: A

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Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.88

Correct Answer: A

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Question 7

The diagram below shows the structure of a plant root.

Correct A. The xylem is responsible for transporting water and minerals.

B. The phloem is responsible for transporting sugars and amino acids.

C. The root hair cells are responsible for absorbing water and minerals.

D. The root cap is responsible for protecting the root tip.

Correct Answer: A

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Question 8

A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The solution is then titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, what is the molar mass of the subs\tance?

A. 100 g/mol

B. 150 g/mol

Correct C. 200 g/mol

D. 250 g/mol

Correct Answer: C

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Question 9

The diagram below shows the structure of a neuron.

Correct A. The axon is responsible for transmitting signals away from the cell body.

B. The d\endrite is responsible for receiving signals from other neurons.

C. The cell body is responsible for producing proteins and organelles.

D. The myelin sheath is responsible for insulating the axon.

Correct Answer: A

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Question 10

A 5.0 g sample of a subs\tance is heated to 100°C. If the subs\tance undergoes a phase change, what is the energy required to change the subs\tance from solid to liquid?

A. 10 kJ/mol

Correct B. 20 kJ/mol

C. 30 kJ/mol

D. 40 kJ/mol

Correct Answer: B

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Question 11

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

Correct A. 0.64

B. 0.36

C. 0.48

D. 0.16

Correct Answer: A

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Question 12

A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 0.9

Correct Answer: A

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Question 13

A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angular velocity of the bird's wings?

A. 10 rad/s

Correct B. 20 rad/s

C. 30 rad/s

D. 40 rad/s

Correct Answer: B

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Question 14

A cell is placed in a solution with a pH of 4. If the cell has a membrane potential of -50 mV, what is the concentration of hydrogen ions in the solution?

Correct A. 10^-4 M

B. 10^-5 M

C. 10^-6 M

D. 10^-7 M

Correct Answer: A

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Question 15

A diagram of a plant cell is shown below. What is the function of the organelle labeled 'X'?

A. Photosynthesis

B. Respiration

Correct C. Protein synthesis

D. Storage of nutrients

Correct Answer: C

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Question 16

The process of osmoregulation in bacteria involves the transport of ions across the cell membrane. Which of the following transport mechanisms is primarily responsible for maintaining the osmotic balance in E. coli?

Correct A. Proton motive force

B. Potassium-sodium antiporter

C. Glu\cose symporter

D. ATP-dep\endent pumps

Correct Answer: A

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Question 17

In the context of cell division, what is the primary function of the kinetochore in eukaryotic cells?

Correct A. Attachment of microtubules to the centromere

B. Separation of sister chromatids

C. Formation of the spindle apparatus

D. Initiation of mitosis

Correct Answer: A

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Question 18

The classification of living organisms is based on the concept of homo\logy. Which of the following statements accurately describes homo\logy?

Correct A. The presence of similar structures in different organisms

B. The presence of identical structures in different organisms

C. The presence of unique structures in different organisms

D. The absence of structures in different organisms

Correct Answer: A

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Question 19

The nervous system of an organism is responsible for transmitting and proces\sing information. Which of the following types of neurons is primarily responsible for transmitting sensory information to the brain?

A. Motor neurons

Correct B. Sensory neurons

C. Interneurons

D. Glial cells

Correct Answer: B

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Question 20

The excretory system of an organism is responsible for removing waste products from the body. Which of the following organs is primarily responsible for filtering waste products from the blood in humans?

Correct A. Kidneys

B. Liver

C. Lungs

D. Skin

Correct Answer: A

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Question 21

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 by-product of photosynthesis?

Correct A. Oxygen

B. Carbon dioxide

C. Water

D. Nitrogen

Correct Answer: A

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Question 22

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. Transportation of oxygen and nutrients to cells

B. Removal of waste products from the body

C. Regulation of body temperature

D. Production of hormones

Correct Answer: A

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Question 23

The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins in the stomach?

Correct A. Pep\sin

B. Lactase

C. Amylase

D. Tryp\sin

Correct Answer: A

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Question 24

The human body is susceptible to various diseases, including bacterial, viral, and fungal infections. Which of the following is a type of immune response that involves the activation of immune cells to fight off pathogens?

A. Innate immunity

Correct B. Adaptive immunity

C. Humoral immunity

D. Cell-mediated immunity

Correct Answer: B

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Question 25

The process of respiration in the human body involves the exchange of gases between the body and the environment. Which of the following is a by-product of cellular respiration?

Correct A. Carbon dioxide

B. Oxygen

C. Water

D. Nitrogen

Correct Answer: A

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