BIOLOGY MCQs

                          Biology Set I

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

A. Vein

B. Artery

C. Capillary

D. Nerve

Ans. B

Explanation: The pulmonary artery carries blood from the right side of the heart to the lungs to pick up a fresh supply of oxygen.

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

A. Thiamine

B. Riboflavin

C. Folic acid

D. Ascorbic acid

Ans. D

Explanation: Vitamin b complex consists of 8 vitamins namely B1, B2, B3, B5, B6, B7, B 9 and B12. Vitamin B1 is Thiamine, Vit B2 is Riboflavin, Vit B3 is Niacin, Vit B5 is pantothenic acid, Vit B6 is pyridoxine, biotin, folic acid and Vit B12 is cyanocobalamin.

3. Fungi are plants that lack:

A. Oxygen

B. Carbon dioxide

C. Chlorophyll

D. None of these

Ans. C

Explanation: We know plants prepare their own food and so are known as autotrophs. With the help of photosynthesis they make food in which they produce glucose from carbon dioxide and sunlight. Also, oxygen is released by plants which is further used by humans and other animals. But Fungi lack chlorophyll and do not engage in photosynthesis.

4. What makes a reptile a reptile?

A. Cold blooded

B. Warm Blooded

C. Non-Hearing

D. Egg-laying

Ans. D

Explanation: Reptiles skin is covered with hard, dry scales and most repltiles lay eggs. Those animals which are cold-blooded don't automatically maintain a constant body temperature. They have to lay out their eggs in the sun to keep their body heat up.

5. Which blood vessels have the smallest diameter?

A. Capillaries

B. Arterioles

C. Venules

D. Lymphatic

Ans. A

Explanation: Blood is carried through the body by Blood Vessels. With the help of perfusion process capillaries supplies blood to the tissues. The diameter of capillary ranges from 5-10 micrometers. The diameter of arteriole is approx. 30 micrometer.

6. Which of the following is an air-borne disease?

A. Measles

B. Typhoid

C. Pink eye

D. None of the above

Ans. A

Explanation: Airborne diseases are the infections spread by airborne transmissions including Chickenpox, Anthrax, Influenza, Measles, Smallpox, Cryptococcosis and Tuberculosis.

7.  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?

A. Pollen

B. Sperm

C. Spore

D. Sporocyst

Ans. A

Explanation: The yellow powder is called pollen and the stick that holds it is known as stamen.

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

A. Liver

B. Pancreas

C. Gall bladder

D. Kidney

Ans. A

Explanation: Liver produces a digestive fluid known as bile. Liver releases Bile into Gall Bladder, a small, pear-shaped organ located just below your liver in the upper right side of your abdomen.

 9. Which of the following hormones is a steroid?

A. Estrogen

B. Glucagon

C. Insulin

D. Oxytocin

Ans. A

Explanation: Steroid hormone is produced by three endocrine organs. The testes, produces testosterone; the ovaries, produces estrogen; and the adrenal cortex, produces steroid hormones such as cortisol and aldosterone. Steroid hormones are derived from cholesterol and are lipid-soluble molecules.

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

A. Regulation of blood sugar

B. Enzyme activation

C. Detoxiation

D. Reproduction

Ans. D

Explanation: Liver is the body's largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production. It also detoxifies chemicals and metabolizes drugs.

                   Biology Set II

1. Which part of human body skin has greatest number Sweat glands?

A. Forehead

B. Forearm

C. Palm of the hand

D. Back

Ans: C

2. Who among the following had started vaccination?

A. Jonas E. Salk

B. Paul Muller

C. Edward Jenner

D. Robert Frost

Ans: C

3. Proteins are consists of:

A. Sugars

B. Amino acids

C. Fatty acids

D. Nucleic acids

Ans: B

4. Liver, milk, egg yolk, fish liver oil is the source of:  

A. Vitamin A

B. Vitamin B2

C. Vitamin D

D. Vitamin C

Ans: C

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

A. DNA/Double helix: F. Crick J. Watson, M. Wilkins

B. Modern classification of plants and animals based on a system: Harvey

C. Bacteria: Linnaeus

D. Blood travels in a continuous circuit: Leuwenhock

Ans: A

6.  Heart is made up of

A. Non-striated muscle

B. Cardiac muscle

C. Adipose tissue

D. Striated muscle

Ans: B

7. Hargobind Khorana's work relates to:  

A. Synthesis of simple DNA

B. Understanding the genetic code

C. Reduction of mutation

D. Synthesis of RNA from bacterial cell

Ans: B

8. Which of the following corona virus that kills human?

A. AIDS

B. FAIDS

C. SARS

D. HIV

Ans: C

9. Digestion of proteins starts in the:  

A. Mouth

B. Stomach

C. Duodenum

D. Intestine

Ans: B

10. Which of the following acid that is secreted in the stomach?

A. HCl

B. H₂S0₄

C. H₂C0₃

D. HNO₃

Ans:  A

1. Which vitamin is needed to prevent Xero-phthalmia?

A. A

B. B

C. C

D. D

Ans:  A

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

A. March at a regular pace

B. Appear uniform

C. Defend the body

D. Disciplined

Ans: C

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

A. Viruses

B. Bacteria

C. Parasites

D. All the above

Ans: A

4. Which among the following is not an example of carbohydrate?

A. Maltose

B. Fructose

C. Glycogen

D. Glycine

Ans: D

5. Which one of the following is not correctly matched?

A. Haemoglobin: Skin

B. Vitamin C: Scurvy

C. Carbohydrate: Potato

D. Fat: Butter

Ans: A

6. Which is a communicable disease?

A. Asthma

B. Scurvy

C. Measles

D. Diabetes

Ans: C

7. Which one of the following is not correctly matched?

A. Tuberculosis: Lungs

B. Filaria: Lymph nodes

C. Encephalitis: Heart

D. Leukaemia: Blood cells

Ans: C

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

A. Groundnut

B. Soyabean

C. Apple

D. Wheat

Ans: B

9. Which of the following have Alpha-keratin as protein?

A. Blood

B. Eggs

C. Skin

D. Wool

Ans: D

10.  Mushrooms are/can be:  

A. A variety of fungus

B. Fleshy, fruiting bodies of the fungus

C. Grown in small sheds or plots

D. All the above

Ans: D

1. Which of the following is not a primary food product?  

A. Vegetables

B. Milk

C. Cereals

D. Fruits

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

A. Brinjal

B. Lady's finger

C. Potato

D. Tomato

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

A. Haemoglobin

B. Phagocytes

C. Red blood cells

D. Blood platelets

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

A. Cerebrum

B. Cerebellum

C. Medulla

D. Spinal cord

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

A. Haemoglobin increase in blood

B. Marked increase of white corpuscles in blood

C. Marked increase of protein and calcium

D. Marked reduction of proteins in blood

6. What is blood pressure?

A. It is the pressure that the blood clot exerts over the brain.

B. It is the pressure that blood receives on account of faulty commands from the brain.

C. It is the pressure that fatness or old age exerts on the body's circulatory system.

D. 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.

7. Select the correct pair of disease and its causes:

A. Trichinosis  - Bacterial infections

B. Sleeping sickness - Eating uncooked Pork

C. Athlete’s foot- Fungus

D. Meningitis - Protozoan (bite of tsetse fly)

8. Which of the following blood vessel that carries deoxygenated blood?

A. Aorta

B. Pulmonary artery

C. Hepatic artery

D. Pulmonary vein

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

A. Bones

B. Hair

C. Muscles

D. Connective tissue

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

A. Caries          - Epidermal tissue of the body

B. Ring worm    - Brain and Spinal cord

C. Meningitis     - Teeth

D. Pneumonia   - Lungs

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

A. Dust      

B. Smoke

C. Pollen    

D. Moisture

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

A. Earthworm      

B. Snake

C. Fish       

D. Frog

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

A. Bacterium       

B. Virus

C. Viroid

D. Prion

4. What is another name of Vitamin K? 

A. Nicotinic acid

B. Riboflavin

C. Thiamine

D. 2 Methyl-1, 4-naphthoquinone

5. Which of the following hormone controlled the blood pressure? 

A. Vasopressin     

B. Oxytocin

C. Estrogens        

D. Testosterone

6. Brain and the spinal cord are invested by membranes called: 

A. Arachnoids        

B. Pleural membrane

C. Meninges        

D. None of these

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

A. Pseudomonas

B. Nitrosomonas

C. Nitrobacter      

D. Rhizobium

8. Consider the following with reference to human nutrition:

1. Vitamin A        

2. Vitamin B2

3. Vitamin E

For which of these are green leafy vegetables rich sources?

A. 1 and 2  

B. 2 only

C. 1 and 3  

D. 1,2 and 3

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

A. Laws of Inheritance                      - Lamarck

B. Theories of Organic Evolution       - Darwin                         

C. Theories of Natural Selection        - Mendel                        

D. Germplasm Theory                        - Weismann

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

A. Guava    

B. Pineapple

C. Orange  

D. Tomato

1. Which one of the following pairs is not correctly matched?

A. Becquerel: Radioactivity

B. Alexander Fleming: Penicillin

C. Louis Pasteur: Blood groups

D. William Harvey: Blood circulation

Ans: C

2. Which of the following is a sexually transmitted disease?  

A. Leukaemia

B. Hepatitis

C. Colour Blindness

D. All of the above

Ans: C

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

A. Cardiovascular

B. Immune

C. Respiratory

D. Reproductive

Ans: B

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

A. Left atrium

B. Left ventricle

C. Right atrium

D. Right ventricle

Ans: B

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

A. Nitrogen

B. Potassium

C. Phosphorus

D. None of these

Ans: B

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

A. Ribosomes

B. Golgi bodies

C. Lysosomes

D. Nucleoli

Ans: C

7. Chromosome complement in Turner's syndrome is

A. 47; XXY

B. 45; XO

C. 46; XX

D. 47; XYY

Ans: B

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

A. Kidney

B. Liver

C. Spleen

D. Rectum

Ans: A

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

A. Myopia

B. Hyper- myopia

C. Astigmatism

D. None of the above

Ans: D

10. Who among the following discovered the anti-rabies vaccine?

A. Edward Jenner

B. James Lind

C. Louis Pasteur

D. Robert Koch

Ans:  C

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

A. Incisors

B. Canines

C. Molars

D. Premolars

Ans:  C

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

A. Antonine Laurent Lavoisier

B. Joseph Priestley

C. Louis Pasteur

D. William Harvey

Ans: B

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

A. Release of less oxygen

B. Release of more oxygen

C. Release of carbon dioxide

D. Release of carbon monoxide

Ans: C

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

A. 60

B. 72

C. 84

D. 96

Ans: B

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

A. 1 litre

B. 1.5 litres

C. 3.0 litres

D. 5.0 litres

Ans: B

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

A. Cornea

B. Choroid

C. Iris

D. Vitreous body

Ans: C

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

A. Prolactin

B. Oxytocin

C. Vasopressin

D. Estrogen and Progesterone

Ans: B

8. Where does fertilization occurs in the female?

A. Fallopian tube

B. Uterus

C. Cervix

D. Vagina

Ans: A

9. Which of the following is the universal recipient blood group?

A. A

B. B

C. AB

D. 0

Ans: C

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

A. 0 per cent

B. 25 per cent

C. 50 per cent

D. 100 per cent

Ans: A

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

A. A

B. AB

C. B

D. O

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

A. Leaves

B. Fruits

C. Root

D. Stem bark

3. 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?

A. Kwashiorkor

B. Marasmus

C. Rickets

D. Pellagra

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

A. The compound carboxy-haemoglobin (COHb) it forms with haemoglobin can gradually clot the blood resulting in circulatory failure.

B. COHb reduces the ability of blood to transport oxygen by rupturing a vast majority of erythrocytes.

C. COHb is stable compound and thus deprives blood of its ability to transport oxygen.

D. COHb greatly modifies the structure of haemoglobin thus making it lose its affinity for oxygen.

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

A. 2 sec

B. 5 sec

C. 15 to 20 sec

D. 5 min

6. How many bones comprise the adult human skeleton?

A. 204 bones

B. 206 bones

C. 208 bones

D. 214 bones

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

A. Discharge of large quantities of Crocus (yellow kesar) pollen grains into the air.

B. Discharge of large quantities of pinus pollen grains into the air forming yellowish clouds.

C. Release of a large amount of sulphur particles into the air from factories processing sulphur.

D. Release of a large amount of sulphur particles into the air near sulphur mines.

8. 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:

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

9. 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:

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

10.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:

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true