Unknown Facts: Hardest Biology Quiz!

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  • 1/126 Questions

    What is the biggest organ in the human body?

    • Skin
    • Heart
    • Brain
    • Lungs
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About This Quiz


Do you believe that you can pass this most challenging biology quiz? There are so many applications of biology in solving health problems. For example, analgesics affect calming pain while antiseptics reduce or halt micro-organisms' growth. From biology, vaccines have been created to fight against diseases, reducing mortality rates. This remarkable hardest biology quiz is the ideal way to test See moreyour knowledge; good luck.

Unknown Facts: Hardest Biology Quiz! - Quiz

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  • 2. 

    How many lobes does a human brain have?

    • 4

    • 2

    • 6

    • 10

    Correct Answer
    A. 4
    Explanation
    The human brain has four lobes: the frontal lobe, parietal lobe, temporal lobe, and occipital lobe. Each lobe has its own specific functions and plays a crucial role in various cognitive processes such as thinking, perception, memory, and sensory integration. The frontal lobe is responsible for decision-making and problem-solving, the parietal lobe for sensory information processing, the temporal lobe for auditory processing and memory, and the occipital lobe for visual processing.

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  • 3. 

    What is the largest muscle in the human body?

    • Gluteus Maximus

    • Calf muscles

    • Bursae

    • Biceps

    Correct Answer
    A. Gluteus Maximus
    Explanation
    The gluteus maximus is the largest muscle in the human body. It is located in the buttocks and is responsible for hip extension, thigh abduction, and external rotation of the hip joint. It is a powerful muscle that helps in various movements such as walking, running, and climbing stairs. Its size and strength make it the largest muscle in the body.

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  • 4. 

    Which of these is the largest bone in the human body?

    • Femur

    • Tibia

    • Humorous

    • Ulna

    Correct Answer
    A. Femur
    Explanation
    The femur is the largest bone in the human body. It is located in the thigh and extends from the hip to the knee. The femur is responsible for supporting the weight of the body and plays a crucial role in walking, running, and other lower body movements. It is also the strongest bone in the body, designed to withstand the forces exerted on it during daily activities.

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  • 5. 

    What are your nails made of?

    • Keratin

    • Gelatin

    • Cholesterol

    • Calcium

    Correct Answer
    A. Keratin
    Explanation
    Nails are made of keratin, a tough and protective protein that is also found in hair and the outer layer of our skin. Keratin provides strength and structure to the nails, allowing them to grow and protect the sensitive nail bed underneath. Gelatin, cholesterol, and calcium do not play a role in the composition of nails.

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  • 6. 

    How many lungs in a human body?

    • 2

    • 1

    • 4

    • 8

    Correct Answer
    A. 2
    Explanation
    The correct answer is 2 because a human body typically has two lungs. The lungs are essential organs responsible for breathing, oxygenating the blood, and removing carbon dioxide. Each lung is located in the chest cavity, with the right lung having three lobes and the left lung having two lobes. Together, they enable the exchange of gases and play a vital role in the respiratory system.

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  • 7. 

    A baby has 270 bones. How many bones does an adult have?

    • 206

    • 256

    • 306

    • 356

    Correct Answer
    A. 206
    Explanation
    As a person grows from a baby to an adult, some of their bones fuse together. This process, known as ossification, reduces the overall number of bones in the body. Therefore, an adult has 206 bones, which is the correct answer.

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  • 8. 

    A fetus acquires fingerprints at what age?

    • Three months

    • Nine months

    • Six months

    • Immediately

    Correct Answer
    A. Three months
    Explanation
    Fingerprints start to form on a fetus at around three months of gestation. By this time, the ridges and patterns on the fingertips have developed enough to create unique fingerprints. The development of fingerprints is a result of the interaction between genetic factors and the environment within the womb. At three months, the fetus has reached a stage where the skin has developed enough for the formation of these distinct patterns.

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  • 9. 

    About how many pints of blood are in the human body?

    • 8

    • 18

    • 28

    • 1

    Correct Answer
    A. 8
    Explanation
    The human body contains approximately 8 pints of blood.

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  • 10. 

    Bananas contain the natural chemical serotonin. How does it make a person feel?

    • Happy

    • Sleepy

    • Angry

    • Sad

    Correct Answer
    A. Happy
    Explanation
    Bananas contain the natural chemical serotonin, which is known as the "happy hormone." Serotonin helps regulate mood, emotions, and contributes to feelings of well-being and happiness. Therefore, consuming bananas can boost serotonin levels in the brain, leading to a happier mood.

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  • 11. 

    Genetic information is transferred from parent to daughter cells through what?

    • Nucleus

    • Mitochondria

    • Centrioles

    • Blood

    Correct Answer
    A. Nucleus
    Explanation
    The nucleus is responsible for storing and transmitting genetic information from parent to daughter cells. It contains the DNA, which carries the genetic instructions for the development and functioning of organisms. During cell division, the DNA is replicated and then distributed equally into the daughter cells. This process ensures that the genetic information is passed down accurately and allows for the continuity of traits from one generation to the next.

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  • 12. 

    How many chambers is the heart divided into?

    • 4

    • 3

    • 2

    • 6

    Correct Answer
    A. 4
    Explanation
    The heart is divided into four chambers: two atria and two ventricles. The atria receive blood from the body and lungs, while the ventricles pump blood out to the body and lungs. This division of chambers allows for efficient circulation of oxygenated and deoxygenated blood throughout the body.

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  • 13. 

    How many chromosomes are in the human gene?

    • 46

    • 24

    • 36

    • 61

    Correct Answer
    A. 46
    Explanation
    The correct answer is 46 because humans typically have 23 pairs of chromosomes, for a total of 46 chromosomes. Each pair consists of one chromosome inherited from the mother and one from the father. These chromosomes contain the genetic information that determines our traits and characteristics.

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  • 14. 

    How many joints are in the human body?

    • 230

    • 567

    • 198

    • 410

    Correct Answer
    A. 230
    Explanation
    The human body has 230 joints. Joints are the areas where two or more bones meet and allow movement. They are found in various parts of the body, including the fingers, toes, knees, elbows, and spine. These joints enable us to perform a wide range of movements, such as bending, twisting, and rotating. Each joint is surrounded by connective tissues, such as ligaments and tendons, which provide stability and support.

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  • 15. 

    How many pairs of chromosomes are in a human cell?

    • 23

    • 46

    • 14

    • 102

    Correct Answer
    A. 23
    Explanation
    A human cell contains 23 pairs of chromosomes. Each pair consists of two chromosomes, one inherited from the mother and one from the father. These chromosomes carry genetic information and determine various traits and characteristics of an individual. The total number of chromosomes in a human cell is 46, with 23 coming from each parent. Therefore, the correct answer is 23.

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  • 16. 

    How many pairs of cranial nerves are there?

    • 12

    • 8

    • 4

    • 2

    Correct Answer
    A. 12
    Explanation
    There are 12 pairs of cranial nerves in the human body. These nerves originate from the brain and are responsible for various functions such as sensory perception, motor control, and the regulation of many bodily processes. Each pair of cranial nerves serves a specific purpose and innervates different areas of the head, neck, and organs. Therefore, the correct answer is 12.

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  • 17. 

    How much does the average human brain weigh?

    • 1,400 grams

    • 2,400 grams

    • 400 grams

    • 3,400 grams

    Correct Answer
    A. 1,400 grams
    Explanation
    The average human brain weighs approximately 1,400 grams. This weight is based on the average adult brain and can vary slightly depending on factors such as age, sex, and overall health. The brain is a vital organ responsible for processing information, controlling bodily functions, and enabling cognitive abilities. It is composed of neurons, glial cells, and various structures that contribute to its weight.

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  • 18. 

    If you take a class in Mycology, what are you studying?

    • Fungi

    • Flowers

    • Spider webs

    • Clouds

    Correct Answer
    A. Fungi
    Explanation
    If you take a class in Mycology, you are studying fungi. Mycology is the branch of biology that deals with the study of fungi, including their identification, classification, and biology. Fungi are a diverse group of organisms that include mushrooms, yeasts, molds, and lichens. They play important roles in various ecosystems, as decomposers, pathogens, and symbiotic partners. By studying fungi, scientists can gain a better understanding of their ecological significance, their impact on human health, and their potential applications in various industries such as medicine and agriculture.

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  • 19. 

    In what part of the body are the Betz cells found?

    • Brain

    • Ears

    • Heart

    • Eyes

    Correct Answer
    A. Brain
    Explanation
    Betz cells are found in the brain. These cells are large pyramidal neurons located in the primary motor cortex, specifically in the precentral gyrus. They are responsible for initiating voluntary muscle movements and play a crucial role in motor control.

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  • 20. 

    Motor nerves carry nerve impulses to the muscles from what?

    • The senses

    • The brain

    • The heart

    • The muscles

    Correct Answer
    A. The senses
    Explanation
    Motor nerves carry nerve impulses from the brain to the muscles, allowing for voluntary movement and control. The senses, such as sight, touch, and hearing, provide information to the brain about the environment, which is then processed and sent to the muscles via motor nerves to initiate the appropriate motor response. Therefore, the correct answer is "the senses".

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  • 21. 

    Sensory nerves carry nerve impulses from the senses to what?

    • Brain

    • Motor nerves

    • Muscles

    • Heart

    Correct Answer
    A. Brain
    Explanation
    Sensory nerves carry nerve impulses from the senses to the brain. The brain is responsible for processing and interpreting sensory information, allowing us to perceive and make sense of our surroundings. Sensory nerves transmit signals from sensory receptors located throughout the body to the brain, where they are processed and integrated with other information to generate appropriate responses. This enables us to experience sensations such as touch, taste, smell, sight, and hearing.

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  • 22. 

    The death of an entire species is called what?

    • Extinction

    • Evolution

    • Extermination

    • Infection

    Correct Answer
    A. Extinction
    Explanation
    Extinction refers to the death or disappearance of an entire species. It occurs when there are no remaining individuals of a particular species alive. This can happen due to various reasons such as habitat destruction, climate change, natural disasters, or human activities. Extinction is a natural process that has been occurring throughout the history of life on Earth, but it is currently happening at an alarming rate due to human-induced factors.

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  • 23. 

    The pH value of human blood is?

    • 7.4

    • 6.1

    • 8.5

    • 9.8

    Correct Answer
    A. 7.4
    Explanation
    The correct answer is 7.4. The pH value of human blood is slightly alkaline, with a pH range of 7.35 to 7.45. This pH range is important for maintaining the body's homeostasis and ensuring that various physiological processes can function properly. Any significant deviation from this pH range can lead to health issues and disrupt the body's normal functioning.

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  • 24. 

    What absorbs most of the water in the alimentary tract?

    • The large intestine

    • The small intestine

    • The esophagus

    • The stomach

    Correct Answer
    A. The large intestine
    Explanation
    The large intestine absorbs most of the water in the alimentary tract. This is because the main function of the large intestine is to reabsorb water from the indigestible food residue that passes through it. The small intestine primarily absorbs nutrients from the food, while the esophagus and stomach are not involved in water absorption. Therefore, the large intestine is the correct answer as it plays a crucial role in maintaining water balance in the body by absorbing water from the undigested food.

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  • 25. 

    What are leukocytes?

    • White blood cells

    • Red blood cells

    • Liver cells

    • Platelets

    Correct Answer
    A. White blood cells
    Explanation
    Leukocytes, also known as white blood cells, are an essential part of the immune system. They play a crucial role in defending the body against infections and diseases. Unlike red blood cells, which carry oxygen, leukocytes are responsible for identifying and destroying harmful pathogens, such as bacteria and viruses. They are produced in the bone marrow and circulate throughout the body, patrolling for any signs of infection or inflammation. Therefore, leukocytes are the correct answer to the question.

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  • 26. 

    What are the oldest, most widely cultivated and used nuts in the world?

    • Almonds

    • Peanuts

    • Walnuts

    • Cashews

    Correct Answer
    A. Almonds
    Explanation
    Almonds are considered the oldest, most widely cultivated, and used nuts in the world. They have a long history of cultivation, dating back thousands of years. Almonds are highly versatile and can be consumed in various forms, including raw, roasted, or as an ingredient in various dishes and desserts. They are also rich in nutrients such as healthy fats, protein, fiber, and vitamin E, making them a popular choice among health-conscious individuals. Additionally, almonds have been used in traditional medicine and skincare products for their potential health benefits.

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  • 27. 

    What bone is located in the collar region?

    • Clavicle

    • Hyoid

    • Temporal

    • Frontal

    Correct Answer
    A. Clavicle
    Explanation
    The bone located in the collar region is the clavicle. The clavicle, also known as the collarbone, is a long bone that connects the shoulder to the sternum. It is easily visible and palpable, forming a prominent bump at the top of the chest. The clavicle plays a crucial role in stabilizing the shoulder joint and allowing for a wide range of arm movements.

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  • 28. 

    What bone is located in the upper jaw?

    • Maxilla

    • Clavicle

    • Femur

    • Frontal

    Correct Answer
    A. Maxilla
    Explanation
    The maxilla is the correct answer because it is a bone that is located in the upper jaw. It is a paired bone that forms the upper part of the jaw and contains the upper teeth. The maxilla also contributes to the formation of the nasal cavity, orbits, and the roof of the mouth. The clavicle is a bone that is located in the shoulder region, the femur is the thigh bone, and the frontal bone is located in the forehead region of the skull.

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  • 29. 

    What cell component is commonly used for personal identification?

    • DNA

    • RNA

    • REM

    • Amino Acid

    Correct Answer
    A. DNA
    Explanation
    DNA is commonly used for personal identification because it contains unique genetic information that is specific to each individual. DNA profiling, also known as DNA fingerprinting, compares specific regions of an individual's DNA to determine their identity. This method is highly accurate and reliable, making it a widely used tool in forensic science, paternity testing, and other applications where personal identification is required. RNA, REM, and amino acids do not possess the same level of uniqueness and specificity as DNA, making them less suitable for personal identification purposes.

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  • 30. 

    What disease causes rapid and uncontrolled growth of abnormal cells?

    • Cancer

    • Leprosy

    • Hemophilia

    • Malaria

    Correct Answer
    A. Cancer
    Explanation
    Cancer is a disease that causes rapid and uncontrolled growth of abnormal cells. These cells divide and spread uncontrollably, forming tumors that can invade nearby tissues and spread to other parts of the body. Cancer can affect any part of the body and is caused by a combination of genetic mutations, environmental factors, and lifestyle choices. It is a serious and potentially life-threatening condition that requires medical intervention for diagnosis, treatment, and management.

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  • 31. 

    What disease causes yellowing of the eyes, skin and urine?

    • Jaundice

    • Malaria

    • Cancer

    • Cholera

    Correct Answer
    A. Jaundice
    Explanation
    Jaundice is a condition that causes yellowing of the eyes, skin, and urine. It occurs when there is a buildup of bilirubin, a yellow pigment, in the bloodstream. This can happen due to various reasons such as liver disease, hepatitis, or obstruction of the bile ducts. The yellowing of the eyes, skin, and urine is a characteristic symptom of jaundice, making it the correct answer to the question. Malaria, cancer, and cholera do not typically cause yellowing of the eyes, skin, and urine.

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  • 32. 

    What do animal cells NOT contain?

    • Cell walls

    • Ribosomes

    • Plasma

    • Mitochondria

    Correct Answer
    A. Cell walls
    Explanation
    Animal cells do not contain cell walls. Cell walls are a rigid layer that surrounds the cell membrane in plant cells, fungi, and bacteria. However, animal cells do have a plasma membrane, ribosomes, and mitochondria. The plasma membrane is a selectively permeable barrier that controls the movement of substances in and out of the cell. Ribosomes are responsible for protein synthesis, and mitochondria are the powerhouse of the cell, producing energy in the form of ATP.

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  • 33. 

    What filters the blood to excrete harmful substances in the form of urine?

    • Kidneys

    • Lungs

    • Intestines

    • Gallbladder

    Correct Answer
    A. Kidneys
    Explanation
    The kidneys are responsible for filtering the blood to remove harmful substances and waste products, which are then excreted in the form of urine. The kidneys play a crucial role in maintaining the body's overall balance of fluids, electrolytes, and pH levels. They filter the blood by removing toxins, excess water, and metabolic waste products, while reabsorbing essential substances like glucose and amino acids. The filtered waste is then transported to the bladder as urine, which is eventually eliminated from the body.

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  • 34. 

    What helps keep the human body cool?

    • Perspiration

    • Urination

    • Mastication

    • Respiration

    Correct Answer
    A. Perspiration
    Explanation
    Perspiration helps keep the human body cool by evaporating heat from the skin's surface. When we sweat, the moisture on our skin evaporates, which cools down the body. This is an important mechanism for regulating body temperature, especially during physical activity or in hot environments. Urination, mastication, and respiration do not directly contribute to cooling the body.

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  • 35. 

    What is 70% of the human body made of?

    • Water

    • Skin

    • Blood

    • Muscle

    Correct Answer
    A. Water
    Explanation
    The human body is made up of approximately 70% water. Water is essential for various bodily functions such as maintaining body temperature, transporting nutrients, lubricating joints, and removing waste. It is present in cells, tissues, and organs, and plays a vital role in overall health and well-being. Therefore, water is the correct answer to the question.

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  • 36. 

    What is a fertilized human egg initially called?

    • Zygote

    • Fetus

    • Embryo

    • A baby

    Correct Answer
    A. Zygote
    Explanation
    A fertilized human egg is initially called a zygote. After fertilization, when the sperm and egg combine, the resulting single cell is known as a zygote. It is the earliest stage of human development and marks the beginning of the formation of a new individual. The zygote will undergo multiple cell divisions and eventually develop into an embryo, which further develops into a fetus and eventually a baby.

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  • 37. 

    What is a single piece of coiled DNA called?

    • Chromosome

    • Atom

    • Node

    • Nucleoli

    Correct Answer
    A. Chromosome
    Explanation
    A single piece of coiled DNA is called a chromosome. Chromosomes are structures that contain genetic information in the form of genes. They are found in the nucleus of cells and are responsible for carrying and transmitting hereditary traits from one generation to another. Chromosomes are made up of DNA molecules that are tightly coiled and organized. Each species has a specific number of chromosomes, and they are visible during cell division when they become more condensed and easily observable under a microscope.

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  • 38. 

    What is Botany the study of?

    • Plants

    • Insects

    • Bottles

    • Seeds

    Correct Answer
    A. Plants
    Explanation
    Botany is the study of plants. It involves the scientific study of plant life, including their structure, growth, reproduction, physiology, and classification. Botanists study various aspects of plants, such as their anatomy, genetics, ecology, and evolution. They also investigate plant diseases, develop new plant varieties, and explore the potential uses of plants in medicine, agriculture, and industry.

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  • 39. 

    What is glucose?

    • Monosaccharide

    • Disaccharide

    • Polysaccharide

    • Lipid

    Correct Answer
    A. Monosaccharide
    Explanation
    Glucose is a type of sugar that is classified as a monosaccharide. Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar molecule. Glucose is an essential source of energy for living organisms and is commonly found in foods such as fruits, honey, and some vegetables. It is also a key component in the process of cellular respiration, where it is broken down to release energy.

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  • 40. 

    What is the cell membrane made of?

    • Phospholipids

    • Glycocolax

    • Prokaryotes

    • Glucose

    Correct Answer
    A. Phospholipids
    Explanation
    The cell membrane is made up of phospholipids. Phospholipids are a type of lipid molecule that have a hydrophilic (water-loving) head and hydrophobic (water-fearing) tails. These molecules arrange themselves in a double layer, with the hydrophilic heads facing outward towards the watery environment and the hydrophobic tails facing inward, creating a barrier between the inside and outside of the cell. This structure allows the cell membrane to be selectively permeable, controlling the movement of substances in and out of the cell.

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  • 41. 

    What is the correct name for the nerve cell?

    • The neuron

    • The nerve

    • The responder

    • The neural link

    Correct Answer
    A. The neuron
    Explanation
    The correct name for the nerve cell is the neuron. The term "neuron" refers to the specialized cells in the nervous system that transmit information through electrical and chemical signals. Neurons are responsible for processing and transmitting information, allowing for communication between different parts of the body and the brain.

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  • 42. 

    What is the fastest-growing plant?

    • Bamboo

    • Ferns

    • Coconut

    • Palms

    Correct Answer
    A. Bamboo
    Explanation
    Bamboo is the fastest-growing plant because it can grow up to 91 cm (35 inches) in a single day. This rapid growth is due to its unique rhizome system, which allows it to quickly spread and establish new shoots. Additionally, bamboo has a high growth rate because it is a grass, and grasses are known for their fast growth compared to other plant types such as trees or shrubs.

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  • 43. 

    What is the green color in plants named?

    • Chlorophyll

    • Starch

    • Sebum

    • Sap

    Correct Answer
    A. Chlorophyll
    Explanation
    Chlorophyll is the correct answer because it is the pigment responsible for the green color in plants. It plays a crucial role in photosynthesis, the process by which plants convert sunlight into energy. Chlorophyll absorbs light energy from the sun and uses it to produce glucose, which is necessary for the plant's growth and survival. Without chlorophyll, plants would not be able to perform photosynthesis and would not appear green.

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  • 44. 

    What is the largest and longest bone in the human body?

    • The femur

    • The spinal cord

    • The humorous

    • The patella

    Correct Answer
    A. The femur
    Explanation
    The femur is the largest and longest bone in the human body. It is located in the thigh and extends from the hip to the knee. The femur is responsible for supporting the weight of the body and plays a crucial role in walking, running, and other movements. Its size and length make it the largest bone, while its strength and structure allow it to withstand the forces exerted on it during daily activities.

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  • 45. 

    What is the largest artery in the body?

    • Aorta

    • Coronary Artery

    • Pulmonary Artery

    • Renal Artery

    Correct Answer
    A. Aorta
    Explanation
    The aorta is the largest artery in the body. It is responsible for carrying oxygenated blood from the heart to all parts of the body. It originates from the left ventricle of the heart and branches out into smaller arteries to supply blood to various organs and tissues. The aorta plays a crucial role in maintaining blood circulation and delivering oxygen and nutrients to the body's cells.

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  • 46. 

    What is the largest organ in the human body?

    • Skin

    • Bone

    • Gland

    • Liver

    Correct Answer
    A. Skin
    Explanation
    The largest organ in the human body is the skin. It covers the entire body and acts as a protective barrier against external factors such as bacteria, viruses, and physical injuries. The skin also helps regulate body temperature, excretes waste through sweat, and contains sensory receptors that allow us to feel touch, pain, and temperature. Additionally, the skin plays a role in synthesizing vitamin D when exposed to sunlight.

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  • 47. 

    What is the most common element in the human body?

    • Oxygen

    • Calcium

    • Carbon

    • Helium

    Correct Answer
    A. Oxygen
    Explanation
    Oxygen is the most common element in the human body because it plays a vital role in cellular respiration, the process by which cells convert nutrients into energy. Oxygen is necessary for the production of ATP, the molecule that provides energy for various cellular processes. Additionally, oxygen is a key component of water, which makes up a significant percentage of the human body. Oxygen is also found in other molecules such as proteins, lipids, and carbohydrates, further emphasizing its importance in the human body.

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  • 48. 

    What is the most common human blood type?

    • O Positive

    • O Negative

    • AB Positive

    • AB Negative

    Correct Answer
    A. O Positive
    Explanation
    O Positive is the most common human blood type because it is compatible with all other blood types, making it the universal donor. This means that O Positive blood can be given to patients of any blood type in emergency situations when there is no time to determine the recipient's blood type. Additionally, O Positive blood is more common in the population, with around 37% of people having this blood type.

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  • 49. 

    What is the movement of organisms away from sunlight known as?

    • Negative phototaxis

    • Autotrophism

    • Photoperiodism

    • Positive phototaxis

    Correct Answer
    A. Negative phototaxis
    Explanation
    Negative phototaxis is the movement of organisms away from sunlight. This means that when exposed to light, the organisms will move in the opposite direction, trying to avoid the light source. This behavior is commonly observed in many organisms, such as certain bacteria and insects, as they have evolved to seek shelter or protection from harsh sunlight. Autotrophism refers to the ability of organisms to produce their own food, while photoperiodism is the physiological response of organisms to changes in the duration of light and darkness. Positive phototaxis, on the other hand, refers to the movement of organisms towards sunlight.

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  • Mar 21, 2023
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