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Biology Trivia Questions and Answers

Biology Trivia Questions and Answers

Biology Trivia Questions and Answers

Biology Trivia Questions Part 1

1. Invertebrates have no:
a) Temperature b) Means of reproduction c) Internal skeleton

Answer: C.

Invertebrates are a broad category of animals that lack a vertebral column. This includes animals such as gastropods, mollusks, arthropods, and worms. The nervous systems of invertebrates are very different from those of vertebrates with their ventral nerve cords and no spinal chord.
Most invertebrates are small but some can grow to be extremely large (for example the giant squid or the Japanese spider crab). All invertebrate groups can be found in water except for the sponges which need air to breathe and must live either on land or in shallow water.

2. The three groups of mammals are:

Answer: Placentals, monotremes and marsupials.

Placentals are a large group of mammals that make up the largest number of species. It is divided into two sub-groups: monotremes and marsupials.
The word placentals come from the Latin word “placenta” meaning flat cake. This refers to the placenta [a nutritive organ for nourishing the growing embryo in some animals] that these mammals have.

Placentals are believed to have first emerged around the late Paleocene period, about 65 million years ago, just after the demise of non-avian dinosaurs.


Monotremes are mammals that occur only in Australasia. They are unique in the following ways: they lay eggs, have incompletely developed snouts (micro-snor condition), and there is no formation of a proper hard tooth enamel tissue.


Marsupial animals are mammals with a pouch, like the Koala and the opossum. Marsupials that live in South America are called marsupials as well.
Marsupials are mammals that have a pouch on their belly where they keep their babies. They have very short life expectancies compared to other mammals. The kangaroo is one example of a marsupial animal.

3. Insects, arachnids, centipedes and crustaceans are grouped together as:

Answer: Arthropods.

Arthropods are a phylum (Arthropoda) of invertebrate animals which includes insects, arachnids, myriapods and crustaceans. Arthropods possess jointed limbs and cuticles made of chitin, unlike other phyla such as molluscs and annelids which have flexible skins. The word “arthropod” comes from the Greek words ἄρθρον (“joint”) and πούς (“foot”).
Arthropods are bilaterally symmetrical, segmented animals with a body comprising many repeated segments. Their body consists of a head, thorax, and abdomen.

4. The bones of the lower arm are:

Answer: The radius and the ulna.

The radius is the larger of the two lower arm bones and the ulna is smaller. The radius and ulna meet at a joint called the distal radioulnar joint. An important nerve called the radial nerve runs between radius and ulna. The muscle action flexes and supinates forearm (turns palm up).

5. If a purebred brown-eyed man marries a purebred blue-eyed woman, what colour is most likely for their children’s eye colour?

Answer: Brown.

6. The tube between the mouth and the stomach is the:

Answer: Oesophagus.

Oesophagus is the muscular tube that acts as a passage between the pharynx and stomach. It also allows food to pass from the mouth into the stomach.

The oesophagus has three parts:
a) The upper part of oesophagus, after it passes through the pharynx, is called cervical part (about 20 cms) or upper thoracic oesophagus.
b) The first 15-18 cm of oesophagus after passing through diaphragm is called upper mediastinum.
c)The rest of the oesophagus is called true or adult oesophagus (about 5-8 cms).

The contractions that push food along the oesophagus are controlled by a special group of muscles called peristaltic. Dysfunction of these muscles results in difficulty in swallowing or oesophageal obstruction.

7. What is respiration?

Answer: Respiration is the process where air enters the body and uses oxygen to produce energy. Oxygen enters the lungs through the respiratory system. Then it goes into the blood stream. The heart pumps oxygen-rich blood throughout the body. Energy is produced when oxygen combines with food in cells that break down food to provide energy for our bodies to do things.
Respiration refers to breathing which is used for getting oxygen and giving off carbon dioxide by animals, plants, and other living organisms.

8. The liquid part of blood is:

Answer: Plasma.

Plasma ( Greek for “formed thing” ) is a straw-colored liquid that makes up 55 to 60% of the total blood volume in the body. Plasma contains 93% water, 7% blood cells,
1% proteins and trace amounts of other substances.

What does plasma do? How does it help your body?

The plasma carries food and oxygen to cells and takes away waste products, such as carbon dioxide. It also helps control bleeding. The plasma is separated into blood cells by spinning a tube in a centrifuge. Often, red blood cells are given to people who need them in transfusions because they carry oxygen from the lungs to all parts of the body.

9. How many atria are in the human heart?

Answer: Two.

The atria is a collection of chambers in the heart. Each atrium collects blood returning from the body and channels it to the left or right side of the heart, according to what blood vessels it must move into. The ventricle is a single chamber in which blood collects and then pushes outward into circulation.

The left atrium is smaller than the right and is located near the top of the heart. The left atrium receives oxygen-rich blood from two small veins that are actually part of its own structure — the coronary sinus and the great cardiac vein.

Biology Trivia Questions Part 2

10. The study of the interrelationships of living organisms and their environment is:

Answer: Ecology.

Ecology is the study of relationships among organisms and between organisms and their environment. The word “ecology” comes from the Greek oikos, which means “home,” and logos, which means “science,” so ecology can be thought of as a scientific study of home or the natural place where an organism lives.

Studies in ecology attempt to discover why an organism or group of organisms has a particular pattern of behavior.

11. When a person has a heart attack, what artery is blocked?

Answer: Coronary.

Coronary artery disease:
Coronary artery disease is a major cause of myocardial infarction, angina, heart attack, and sudden cardiac death. It is a progressive disease that may lead to complete blockage of one or more coronary arteries. The resulting ischemia can become severe enough that it precipitates one of these events. The most common symptom is angina pectoris, which typically presents as diffuse chest pain or discomfort during physical activity caused by inadequate blood supply to the heart muscle due to obstruction in one or more arteries that supply the myocardium (i.e. the muscle of the heart).

12. What is the name of the circular muscle that controls the flow of urine from the body?

Answer: Sphincter muscle.

Sphincter muscle is a ring composed of smooth muscle that controls the release of a substance. There are sphincters around the anus, urethra, and vagina. A sphincter is controlled voluntarily or involuntarily by stretching it or relaxing it.

13. The gap between one nerve cell and the next is the:

Answer: Synapse.

Synapses are gaps between neurons, or nerve cells, over which a chemical called a neurotransmitter is released.

The electrochemical signals that pass through the synapse are electrical and can be measured as voltage changes in the cell. The neurotransmitter is a chemical that “activates” the next neuron in line to be able to initiate its own signal. This means that if you give a certain neurotransmitter, it will only “activate” the next neuron with the same type of receptor and not others (the activation of other neurons via different receptors by one chemical is known as heterosynaptic modulation).

14. A chemical that is secreted by an endocrine gland and carried in the blood to a target organ to perform a particular function is called:

Answer: A hormone.

Hormones are chemical messengers produced by different glands in the body, such as the thyroid gland, the pituitary gland and the adrenal gland. They can travel in the bloodstream to reach their target cells. Hormones control many of our body’s activities, such as growth and development, blood pressure, metabolism and libido.

Hormones act on different target cells by binding to special molecules in these cells called receptors. For example, insulin is produced by beta cells in the pancreas. It travels around your body to reach muscle and fat cell receptors so it can tell these cell what to do.

15. The relationship where two different organisms live closely together for long periods of time is called:

Answer: Symbiosis.

“Symbiosis is a close, long-term, and often relatively stable relationship between two different biological organisms.”
A host organism is the organism in which a symbiont lives. Symbionts have a greater or lesser effect on the host organism.

Examples of symbiosis include lichens (a symbiotic union of fungi with algae or cyanobacteria), mycorrhizal relationships (a symbiotic relationship between fungi and plants), and mutualism (a relationship between two species in which each benefits from the activity of the other).

16. To induce childbirth, what hormone can be injected intravenously?

Answer: Oxytocin.

Oxytocin is a hormone that’s released by the brain in response to physical contact, especially skin-to-skin. In mammals, it plays a role in maternal bonding and affection. It’s also known as the “love hormone” for its role in human relationships.

What Does Oxytocin Do?

Oxytocin is a peptide neurotransmitter that plays many different roles throughout the body including reproduction, pregnancy, childbirth, nursing and alloparenting (parenting). When our brains become flooded with oxytocin during birth, it promotes relaxation, reduces stress and fear while increasing feelings of warmth and trust for our new-borns. After birth, oxytocin stimulates bonding between mother and infant.

17. An example of a disease that is spread by droplet transmission is:

Answer: Influenza.

Influenza (flu) is a contagious respiratory illness caused by influenza viruses.
Symptoms are similar to other types of respiratory illnesses, and may include fever, cough, sore throat, runny or stuffy nose, muscle aches, headache, chills and fatigue. In some people more severe disease can occur.

While flu viruses are different each year, the flu vaccine is updated yearly to protect against the three or four strains of influenza virus that research suggests will be most common.

18. Examples of amphibians are:

Answer: Frogs and toads.

An amphibian is a cold-blooded animal that lives both on land and in water. They have a long body and short limbs. There are many different types of amphibians, such as frogs, salamanders, toads and newts. Salamanders have four legs (like frogs) but can swim underwater (like fish). Frogs are kind of shaped like humans but they have long back legs for jumping around. Amphibians breathe through their skin, which makes them moist. This means that if you touch an amphibian you can feel them breathe!

19. In a flowering plant, the male sex cell is the:

Answer: Pollen.

Pollen, also called microgametophyte -gametophyte (Figure 1), is a microspore, and refers to the male sex of seed plants.

Pollen consists of pollen grains containing sperm cells. The pollen grain in the plant’s ovule was formed and released by its anther. Pollen grains are dispersed by wind or water to other members of the same plant species or to other plants with compatible pollination requirements (see below). Plants that produce such structures are referred to as gymnosperms (Greek: naked seeds).

20. The muscle that contracts when the forearm is lowered is the:

Answer: Triceps.

The triceps are a group of three muscles that makes up most of the back of the upper arm. The 3 muscles are the long head, lateral head and medial head. It is attached to the scapula via the rear deltoids at its lower end. Triceps also connect to the humerus by attaching to teres minor and infraspinatus at it’s upper end.


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Written by Wicky

My name is Angel Wicky, I'm from Bangalore (India). I am a teacher & I love teaching. Teaching is the best job in the world. Education is the basic and essential part of any human being and teachers are the base of any education system. I'm really happy to be a part of it.

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