Practice Post UTME CALEB UNIVERSITY biology 2023 Past Questions

Question 1

In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?

A. Regulation of body temperature

B. Stimulation of the immune system

Correct C. Maintenance of homeostasis through the release of hormones

D. Regulation of appetite and satiety

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2

A diagram of a plant cell is shown below. Identify the structure labeled 'A'.

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3

A population of rabbits is growing according to the \logistic growth model. If the initial population size is 100 and the carrying capacity is 1000, what is the population size after 5 generations?

A. 500

B. 750

C. 900

Correct D. 950

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4

A diagram of the human digestive system is shown below. Identify the structure labeled 'B'.

A. Esophagus

Correct B. Stomach

C. Small intestine

D. Large intestine

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5

A diagram of the human excretory system is shown below. Identify the structure labeled 'C'.

A. Liver

B. Pancreas

Correct C. Kidney

D. Bladder

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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'?

A. 0.36

Correct B. 0.64

C. 0.72

D. 0.84

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7

A diagram of the human respiratory system is shown below. Which of the following structures is responsible for the exchange of oxygen and carbon dioxide?

A. Trachea

Correct B. Lungs

C. Diaphragm

D. Bronchi

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8

The diagram below shows a cross-section of the human eye. Which of the following structures is responsible for detecting light?

A. Cornea

B. Iris

Correct C. Retina

D. Lens

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9

A population of E. coli is growing in a nutrient-rich environment. If the initial population size is 10^5 cells and the growth rate is 0.5 per hour, what is the population size after 5 hours?

A. 10^6

B. 10^7

Correct C. 10^8

D. 10^9

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 10

A diagram of the human circulatory system is shown below. Which of the following structures is responsible for pumping blood from the heart to the lungs?

Correct A. Heart

B. Pulmonary Artery

C. Pulmonary Vein

D. Lungs

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11

In the context of blood transport systems, what is the primary function of the erythrocytes?

A. To regulate blood pH

Correct B. To transport oxygen and carbon dioxide

C. To filter waste products from the blood

D. To maintain blood pressure

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12

A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this occurs?

Correct A. Transpiration pull

B. Root pressure

C. Capillary action

D. Osmosis

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 13

The nervous system is responsible for transmitting signals throughout the body. What is the primary type of cell that makes up the nervous system?

A. Epithelial cells

B. Connective tissue cells

C. Muscle cells

Correct D. Neurons

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14

The human body is composed of various types of tissues, including epithelial, connective, muscle, and nervous tissues. What is the primary function of epithelial tissue?

A. To provide structural support

Correct B. To facilitate the exchange of nutrients and waste products

C. To produce hormones

D. To regulate body temperature

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 15

The human body is classified into different systems, including the circulatory, respiratory, and digestive systems. What is the primary function of the circulatory system?

Correct A. To transport oxygen and nutrients to cells

B. To remove waste products from the body

C. To regulate body temperature

D. To produce hormones

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16

A population of Drosophila melanogaster is maintained in a laboratory for genetic studies. The population is initially 100 individuals and is allowed to grow exponentially. After 5 generations, the population has increased to 1000 individuals. Assuming a cons\tant growth rate, calculate the intrinsic growth rate (r) of the population.

A. 0.05

Correct B. 0.10

C. 0.15

D. 0.20

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17

In a certain e\cosystem, the primary producers (plants) are the only source of energy for the herbivores. If the primary producers are removed, what will happen to the herbivores?

A. They will increase in number

Correct B. They will decrease in number

C. They will remain the same

D. They will disappear

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18

A 25-year-old woman is diagnosed with a genetic disorder that affects her ability to digest lactose. Which of the following enzymes is most likely deficient in her body?

Correct A. Lactase

B. Amylase

C. Tryp\sin

D. Pep\sin

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19

A certain species of bacteria has a generation time of 2 hours. If the initial population is 1000 individuals, how many bacteria will there be after 5 generations?

A. 10000

B. 20000

Correct C. 40000

D. 80000

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20

A 30-year-old man is diagnosed with a genetic disorder that affects his ability to produce melanin. Which of the following genes is most likely mutated in his body?

Correct A. TYR

B. TYRP1

C. SLC24A4

D. SLC45A2

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21

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'?

A. 0.36

Correct B. 0.64

C. 0.48

D. 0.52

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and then released from rest. What is the maximum speed of the block as it oscillates?

Correct A. 0.5\sqrt{10}

B. 0.5\sqrt{20}

C. 0.5\sqrt{30}

D. 0.5\sqrt{40}

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23

A solution containing 0.1 M glu\cose and 0.1 M fructose is separated by a semipermeable membrane. If the concentration of glu\cose on the other side of the membrane is 0.2 M, what is the concentration of fructose?

Correct A. 0.1

B. 0.2

C. 0.3

D. 0.4

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24

A 5-year-old child is brought to the doctor with a complaint of fever and cough. The doctor orders a chest X-ray, which shows a consolidation in the right lower lobe. What is the most likely diagnosis?

Correct A. Pneumonia

B. Asthma

C. Cystic Fibrosis

D. Tuberculosis

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25

A 30-year-old woman presents with a 2-year history of infertility. Her husband has a normal semen analysis. What is the most likely cause of her infertility?

Correct A. Endometriosis

B. Polycystic Ovary Syndrome (PCOS)

C. Tubal Ligation

D. Uterine Fibroids

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

POST UTME CALEB UNIVERSITY 2023 Biology | Objective

Master the Exam!

Help others prepare! Share this practice hub: