Olete.in – MCQs, Mock Tests & Government Job Prep | Biology MCQs Question and Answer -Biology Set I

Which of the following is a large blood vessel that carries blood away from the heart?

1. Vein
2. Artery
3. Capillary
4. Nerve

✅ Correct Answer: 2

Which of the following is not a member of the vitamin B complex?

1. Thiamine
2. Riboflavin
3. Folic acid
4. Ascorbic acid

✅ Correct Answer: 4

Fungi are plants that lack:

1. Oxygen
2. Carbon dioxide
3. Chlorophyll
4. None of these

✅ Correct Answer: 3

What makes a reptile a reptile?

1. Cold blooded
2. Warm Blooded
3. Non-Hearing
4. Egg-laying

✅ Correct Answer: 4

Which blood vessels have the smallest diameter?

1. Capillaries
2. Arterioles
3. Venules
4. Lymphatic

✅ Correct Answer: 1

Which of the following is an air-borne disease?

1. Measles
2. Typhoid
3. Pink eye
4. None of the above

✅ Correct Answer: 1

A yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life. What is this dust called?

1. Pollen
2. Sperm
3. Spore
4. Sporocyst

✅ Correct Answer: 1

Which organ of the body produces the fluid known as bile?

1. Liver
2. Pancreas
3. Gall bladder
4. Kidney

✅ Correct Answer: 1

Which of the following hormones is a steroid?

1. Estrogen
2. Glucagon
3. Insulin
4. Oxytocin

✅ Correct Answer: 1

Which one of the following is not a function of the liver?

1. Regulation of blood sugar
2. Enzyme activation
3. Detoxification
4. Reproduction

✅ Correct Answer: 4

Greatest number of Sweat glands are present in which part of the human body?

1. Forehead
2. Forearm
3. Palm of the hand
4. Back

✅ Correct Answer: 3

Vaccination was started by.......

1. Jonas E. Salk
2. Paul Muller
3. Edward Jenner
4. Robert Frost

✅ Correct Answer: 3

Proteins are made up of .......

1. Sugars
2. Amino acids
3. Fatty acids
4. Nucleic acids

✅ Correct Answer: 2

Mention the source of Liver, milk, egg yolk, fish liver oil?

1. Vitamin A
2. Vitamin B2
3. Vitamin D
4. Vitamin C

✅ Correct Answer: 3

Which of the following name of scientist and their field of work is correctly matched?

1. DNA/Double helix: F. Crick J. Watson, M. Wilkins
2. Modern classification of plants and animals based on a system: Harvey
3. Bacteria: Linnaeus
4. Blood travels in a continuous circuit: Leuwenhock

✅ Correct Answer: 1

Heart is made up of

1. Non-striated muscle
2. Cardiac muscle
3. Adipose tissue
4. Striated muscle

✅ Correct Answer: 2

Hargobind Khorana had researched on .....

1. Synthesis of simple DNA
2. Understanding the genetic code
3. Reduction of mutation
4. Synthesis of RNA from bacterial cell

✅ Correct Answer: 2

Name the corona virus that kills human?

1. AIDS
2. FAIDS
3. SARS
4. HIV

✅ Correct Answer: 3

In which part of the body digestion of protein starts?

1. Mouth
2. Stomach
3. Duodenum
4. Intestine

✅ Correct Answer: 2

Name the acid that is secreted in the stomach?

1. HCl
2. H2S04
3. H2C03
4. HNO3

✅ Correct Answer: 1

Which vitamin is needed to prevent Xero-phthalmia?

1. A
2. B
3. C
4. D

✅ Correct Answer: 1

Why the white blood corpuscles are popularly called "soldiers of the body”?

1. March at a regular pace
2. Appear uniform
3. Defend the body
4. Disciplined

✅ Correct Answer: 3

Hepatitis is a general term for a disease that is caused by:

1. Viruses
2. Bacteria
3. Parasites
4. All the above

✅ Correct Answer: 1

Which among the following is not an example of carbohydrate?

1. Maltose
2. Fructose
3. Glycogen
4. Glycine

✅ Correct Answer: 4

Which one of the following is not correctly matched?

1. Haemoglobin: Skin
2. Vitamin C: Scurvy
3. Carbohydrate: Potato
4. Fat: Butter

✅ Correct Answer: 1

Which is a communicable disease?

1. Asthma
2. Scurvy
3. Measles
4. Diabetes

✅ Correct Answer: 3

Which one of the following is not correctly matched?

1. Tuberculosis: Lungs
2. Filaria: Lymph nodes
3. Encephalitis: Heart
4. Leukaemia: Blood cells

✅ Correct Answer: 3

Which of the following has the highest protein content per gram?

1. Groundnut
2. Soyabean
3. Apple
4. Wheat

✅ Correct Answer: 2

Which of the following have Alpha-keratin as protein?

1. Blood
2. Eggs
3. Skin
4. Wool

✅ Correct Answer: 4

Mushrooms are/can be:

1. A variety of fungus
2. Fleshy, fruiting bodies of the fungus
3. Grown in small sheds or plots
4. All the above

✅ Correct Answer: 4

Which of the following is not a primary food product?

1. Vegetables
2. Milk
3. Cereals
4. Fruits

✅ Correct Answer: 2

Which of the vegetables have abundance of Vitamins A and C?

1. Brinjal
2. Lady's finger
3. Potato
4. Tomato

✅ Correct Answer: 4

Which of the following defence of the human body against bacteria?

1. Haemoglobin
2. Phagocytes
3. Red blood cells
4. Blood platelets

✅ Correct Answer: 2

Which of the following nerves connected from the eyes to ears?

1. Cerebrum
2. Cerebellum
3. Medulla
4. Spinal cord

✅ Correct Answer: 2

Leukaemia is a disease that results from some kind of disorder in the blood. Precisely, leukaemia occurs due to:

1. Haemoglobin increase in blood
2. Marked increase of white corpuscles in blood
3. Marked increase of protein and calcium
4. Marked reduction of proteins in blood

✅ Correct Answer: 2

What is blood pressure?

1. It is the pressure that the blood clot exerts over the brain.
2. It is the pressure that blood receives on account of faulty commands from the brain.
3. It is the pressure that fatness or old age exerts on the body's circulatory system.
4. It is the amount of pressure on the blood as a result of the heart's pumping function and the resistance of the arterial walls.

✅ Correct Answer: 4

Select the correct pair of disease and its causes:

1. Trichinosis - Bacterial infections
2. Sleeping sickness - Eating uncooked Pork
3. Athlete’s foot- Fungus
4. Meningitis - Protozoan (bite of tsetse fly)

✅ Correct Answer: 3

Which of the following blood vessel that carries deoxygenated blood?

1. Aorta
2. Pulmonary artery
3. Hepatic artery
4. Pulmonary vein

✅ Correct Answer: 2

Which of the following growth of human body affected by somatotrophic hormone?

1. Bones
2. Hair
3. Muscles
4. Connective tissue

✅ Correct Answer: 1

Select the correct match of the disease and its affected part.

1. Caries          - Epidermal tissue of the body
2. Ring worm    - Brain and Spinal cord
3. Meningitis     - Teeth
4. Pneumonia   - Lungs

✅ Correct Answer: 4

Hay fever is an allergic reaction to the presence of the following in the air:

1. Dust
2. Smoke
3. Pollen
4. Moisture

✅ Correct Answer: 3

The behavioural pattern of which one of the following organisms may upset when DOT is used as pesticide?

1. Earthworm
2. Snake
3. Fish
4. Frog

✅ Correct Answer: 3

What causes the 'mad-cow disease' (Jakob-Creutzfeldt disease)?

1. Bacterium
2. Virus
3. Viroid
4. Prion

✅ Correct Answer: 4

What is another name of Vitamin K?

1. Nicotinic acid
2. Riboflavin
3. Thiamine
4. 2 Methyl-1, 4-naphthoquinone

✅ Correct Answer: 4

Which of the following hormone controlled the blood pressure?

1. Vasopressin
2. Oxytocin
3. Estrogens
4. Testosterone

✅ Correct Answer: 1

Brain and the spinal cord are invested by membranes called:

1. Arachnoids
2. Pleural membrane
3. Meninges
4. None of these

✅ Correct Answer: 3

Which one of the following organisms has a role in converting nitrates to free nitrogen?

1. Pseudomonas
2. Nitrosomonas
3. Nitrobacter
4. Rhizobium

✅ Correct Answer: 4

Select correct match of the Biological theories or laws and Scientists.

1. Laws of Inheritance                      - Lamarck
2. Theories of Organic Evolution       - Darwin
3. Theories of Natural Selection        - Mendel
4. Germplasm Theory                    - Weismann

✅ Correct Answer: 4

Which one of the following is the richest source of vitamin C?

1. Guava
2. Pineapple
3. Orange
4. Tomato

✅ Correct Answer: 3

Which one of the following pairs is not correctly matched?

1. Becquerel: Radioactivity
2. Alexander Fleming: Penicillin
3. Louis Pasteur: Blood groups
4. William Harvey: Blood circulation

✅ Correct Answer: 3

Which of the following is a sexually transmitted disease?

1. Leukaemia
2. Hepatitis
3. Colour Blindness
4. All of the above

✅ Correct Answer: 3

Which one of the following systems of the body is primarily attacked by the HIV?

1. Cardiovascular
2. Immune
3. Respiratory
4. Reproductive

✅ Correct Answer: 2

In the human body, the blood enters the aorta of the circulatory system from the:

1. Left atrium
2. Left ventricle
3. Right atrium
4. Right ventricle

✅ Correct Answer: 2

Which one of the following plant nutrients is not supplemented in the soil for growing legumes?

1. Nitrogen
2. Potassium
3. Phosphorus
4. None of these

✅ Correct Answer: 2

Which of the following are known as the suicide bags of cells?

1. Ribosomes
2. Golgi bodies
3. Lysosomes
4. Nucleoli

✅ Correct Answer: 3

Chromosome complement in Turner's syndrome is

1. 47; XXY
2. 45; XO
3. 46; XX
4. 47; XYY

✅ Correct Answer: 2

Excess of amino acids is broken down to form urea in:

1. Kidney
2. Liver
3. Spleen
4. Rectum

✅ Correct Answer: 1

If a person can see an object clearly when it is placed at about 25cm away from him, he is suffering from:

1. Myopia
2. Hyper- myopia
3. Astigmatism
4. None of the above

✅ Correct Answer: 4

Who among the following discovered the anti-rabies vaccine?

1. Edward Jenner
2. James Lind
3. Louis Pasteur
4. Robert Koch

✅ Correct Answer: 3

Which of the following teeth of child (3-4 Years) is not a part of the milk teeth?

1. Incisors
2. Canines
3. Molars
4. Premolars

✅ Correct Answer: 3

Who said this statement? "I flatter myself having discovered the method that nature employs to purify air. It is vegetation."

1. Antonine Laurent Lavoisier
2. Joseph Priestley
3. Louis Pasteur
4. William Harvey

✅ Correct Answer: 2

Why it is not advisable to sleep under a tree at night?

1. Release of less oxygen
2. Release of more oxygen
3. Release of carbon dioxide
4. Release of carbon monoxide

✅ Correct Answer: 3

What is the averages rate of the heart beats (per minute) in an adult?

1. 60
2. 72
3. 84
4. 96

✅ Correct Answer: 2

Which of the following is the volume of the urine produced in an adult human every 24 hours?

1. 1 litre
2. 1.5 litres
3. 3.0 litres
4. 5.0 litres

✅ Correct Answer: 2

Which of the following pigment causes eye colour of person (brown eyes, blue eyes or black eyes)?

1. Cornea
2. Choroid
3. Iris
4. Vitreous body

✅ Correct Answer: 3

Which of the following led to the expulsion of milk from the breast during suckling?

1. Prolactin
2. Oxytocin
3. Vasopressin
4. Estrogen and Progesterone

✅ Correct Answer: 2

Where does fertilization occurs in the female?

1. Fallopian tube
2. Uterus
3. Cervix
4. Vagina

✅ Correct Answer: 1

Which of the following is the universal recipient blood group?

1. A
2. B
3. AB
4. O

✅ Correct Answer: 3

What proportion of children is likely to be colour blindness when their parent (mother has normal vision & father has colour-blindness)?

1. 0 per cent
2. 25 per cent
3. 50 per cent
4. 100 per cent

✅ Correct Answer: 1

Which of the following blood group is considered as Universal Donor?

1. A
2. AB
3. B
4. O

✅ Correct Answer: 4

What part of the Quinine plant is commonly used drug for Malaria?

1. Leaves
2. Fruits
3. Root
4. Stem bark

✅ Correct Answer: 4

Which of the following disease occur when the replacement of breast feeding by less nutritive food, low in proteins and calories, infants below the age of one year?

1. Kwashiorkor
2. Marasmus
3. Rickets
4. Pellagra

✅ Correct Answer: 2

What happen when the exposure to carbon monoxide (from coal gas) is extremely dangerous and can kill a patient?

1. The compound carboxy-haemoglobin (COHb) it forms with haemoglobin can gradually clot the blood resulting in circulatory failure.
2. COHb reduces the ability of blood to transport oxygen by rupturing a vast majority of erythrocytes.
3. COHb is stable compound and thus deprives blood of its ability to transport oxygen.
4. COHb greatly modifies the structure of haemoglobin thus making it lose its affinity for oxygen.

✅ Correct Answer: 3

In how many times human will lose their consciousness if blood will stop flowing to the brain?

1. 2 sec
2. 5 sec
3. 15 to 20 sec
4. 5 min

✅ Correct Answer: 2

How many bones comprise the adult human skeleton?

1. 204 bones
2. 206 bones
3. 206 bones
4. 214 bones

✅ Correct Answer: 2

Which of the following statement is related with the 'Sulphur shower'?

1. Discharge of large quantities of Crocus (yellow kesar) pollen grains into the air.
2. Discharge of large quantities of pinus pollen grains into the air forming yellowish clouds.
3. Release of a large amount of sulphur particles into the air from factories processing sulphur.
4. Release of a large amount of sulphur particles into the air near sulphur mines.

✅ Correct Answer: 2

In the given item consist of two statements, one labelled as 'Assertion (A)' and the other labelled as 'Reason (R)'. Assertion (A): Persons with AB blood group can accept blood from any blood group. Reason (R): They are universal acceptor Select your answers to these items using the codes given below.Codes:

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

✅ Correct Answer: 1

In the given item consist of two statements, one labelled as 'Assertion (A)' and the other labelled as 'Reason (R)'. Assertion (A): Saturated fats are more reactive as compared to unsaturated fats. Reason (R): Molecules of unsaturated fats have double bonds. Select your answers to these items using the codes given below. Codes:

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

✅ Correct Answer: 4

In the given item consist of two statements, one labelled as 'Assertion (A)' and the other labelled as 'Reason (R)'. Assertion (A): The sons of a colour blind woman are always colour blind but not the daughters. Reason (R): Colour blindness is a sex-linked character and such characters are transferred from mother to son only. Select your answers to these items using the codes given below. Codes:

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true and R is the correct explanation of A
3. A is true but R is false
4. A is false but R is true

✅ Correct Answer: 2