Biology Class 12 Objective Questions. We covered all the Biology Class 12 Objective Questions in this post for free so that you can practice well for the exam.
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Biology Class 12 Objective Questions for Students
‘Satiety’ and ‘thirst’ centers in humans are located in which of the following parts of the brain?
(a) Fore-brain
(b) Hypothalamus
(c) Medulla
(d) Optic lobe
Option b – Hypothalamus
In the human brain, memory power is found in ( Biology Class 12 Objective Questions )
(a) Medulla oblongata
(b) Cerebrum
(c) Brain cavity
(d) Cerebellum
Option b – Cerebrum
Which one of the following organs will not feel any pain on being pricked by a needle?
(a) Skin
(b) Brain
(c) Heart
(d) Eye
Option b – Brain
The temperature of the human body ( Biology Class 12 Objective Questions )
(a) Decreases in winters
(b) Increases in summers
(c) Neither decreases in winters nor increases in summers
(d) Increases in winters
Option c – Neither decreases in winters nor increases in summers
Which one of the following parts of the human brain is the regulating center for swallowing and vomiting?
(a) Cerebellum
(b) Cerebrum
(c) Medulla oblongata
(d) Pons
Option c – Medulla oblongata
Identify the part of the brain that controls the maintenance of posture, balance, and equilibrium. ( Biology Class 12 Objective Questions )
(a) Diencephalon
(b) Brainstem
(c) Cerebrum
(d) Cerebellum
Option d – Cerebellum
Which of the following is not a part of the brain?
(a) Medulla
(b) Thalamus
(c) Pons
(d) Pinna
Option d – Pinna
Where is the governing center of reflex action located? ( Biology Class 12 Objective Questions )
(a) In cerebrum
(b) In cerebellum
(c) In spinal cord
(d) In nerve cells
Option c – In spinal cord
Synaptic vesicles contain chemicals called
(a) Synaptic fluid
(b) Neurotransmitters
(c) Vesicular fluid
(d) All of the above
Option b – Neurotransmitters
Body temperature is regulated by ( Biology Class 12 Objective Questions )
(a) Thalamus
(b) Hypothalamus
(c) Cerebellum
(d) Medulla
Option b – Hypothalamus
Coagulation of blood in the vessel is prevented during normal conditions by
(a) Prothrombin
(b) Calcium
(c) Heparin
(d) Albumin
Option c – Heparin
Who performs the task of capturing oxygen in the blood? ( Biology Class 12 Objective Questions )
(a) Chlorophyll
(b) Haemoglobin
(c) Red blood cells
(d) White blood cells
Option b – Haemoglobin
The pH of human’s slightly basic blood is normally around
(a) 1.5-6.5
(b) 5.5-6.5
(c) 7.5-8.0
(d) 8.5-9.0
Option c – 7.5-8.0
Which of the following is not correct regarding hemoglobin? ( Biology Class 12 Objective Questions )
(a) It has a red color.
(b) It carries oxygen from the lungs to cells.
(c) It is slightly acidic.
(d) It carries carbon dioxide from tissues to lungs.
Option c – It is slightly acidic
Measuring glycosylated hemoglobin (HbA1c) is useful for the management of
(a) Anemia
(b) Hemophilia
(c) Diabetes
(d) Hypertension
Option b – Hemophilia
Which cells in our body are popularly called “soldiers of the human body”? ( Biology Class 12 Objective Questions )
(a) Eosinophils
(b) White blood cells
(c) Red blood cells
(d) Basophils
Option b – White blood cells
If the radius of blood vessels decreases, the blood pressure will
(a) Increase
(b) Decrease
(c) Remain the same
(d) Increase in males but decrease in females
Option a – Increase
Neutrophils and lymphocytes originate from ( Biology Class 12 Objective Questions )
(a) Kidney tubule
(b) Spleen
(c) Bone marrow
(d) Lymph node
Option c – Bone marrow
The total volume of blood in a normal adult human being is
(a) 5-6 liters
(b) 3-4 liters
(c) 8-10 liters
(d) 10-12 liters
Option a – 5-6 liters
Which of the following gases reduces the oxygen-carrying capacity of the blood? ( Biology Class 12 Objective Questions )
(a) Nitric oxide
(b) Carbon dioxide
(c) Carbon monoxide
(d) Nitrous oxide
Option c – Carbon monoxide
Person having blood group B can donate blood to a person having group
(a) A and O
(b) B and O
(c) A and AB
(d) B and AB
Option d – B and AB
Which of the following substances, if introduced into the bloodstream, would cause coagulation at the site of its introduction?
(a) Fibrinogen
(b) Prothrombin
(c) Heparin
(d) Thromboplastin
Option d – Thromboplastin
The snake bite firstly affects which part of the body?
(a) Nervous system
(b) Brain
(c) Blood circulation
(d) Lungs
Option c – Blood circulation
In which organ of the human body are lymphocyte cells formed?
(a) Liver
(b) Long bone
(c) Pancreas
(d) Spleen
Option b – Long bone
With which physiological process is thrombin associated?
(a) Excretion
(b) Blood clotting
(c) Reproduction
(d) Growth
Option b – Blood clotting
In a healthy person, the rate of heart beat in one minute is
(a) 58 times
(b) 67 times
(c) 72 times
(d) 90 times
Option c – 72 times
Which chamber of the human heart pumps fully oxygenated blood to the aorta and hence to the body?
(a) Right auricle
(b) Left auricle
(c) Right ventricle
(d) Left ventricle
Option d – Left ventricle
Between which one of the following sets of blood types is transfusion possible?
(a) A and O (A donor)
(b) B and A (B donor)
(c) A and AB (A donor)
(d) AB and O (AB donor)
Option c – A and AB (A donor)
Which blood group is a universal recipient?
(a) A
(b) B
(c) AB
(d) O
Option c – AB
What is the name of the vessel that delivers nutrient-rich blood from the stomach and small intestine to the liver?
(a) Left hepatic artery
(b) Hepatic vein
(c) Right hepatic artery
(d) Hepatic portal vein
Option d – Hepatic portal vein
What is the blood pressure (systolic and diastolic) of a healthy man?
(a) 120 mm and 80 mm
(b) 201 mm and 110 mm
(c) 90 mm and 60 mm
(d) 85 mm and 55 mm
Option a – 120 mm and 80 mm
Which part of the body is responsible for the manufacture of red blood cells?
(a) Lungs
(b) Heart
(c) Brain
(d) Bone marrow
Option d – Bone marrow
Which instrument is used to measure blood pressure?
(a) Lactometer
(b) Thermometer
(c) Sphygmomanometer
(d) Glucometer
Option c – Sphygmomanometer
If a father has blood group A and a mother has blood group O, which one of the following blood groups may be present in their son?
(a) B
(b) AB
(c) O
(d) B, AB, and O
Option c – O
With reference to the blood in a normal person, which one of the following statements is correct?
(a) Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time.
(b) Blood cells constitute about 70% of the total volume of the blood.
(c) White Blood Cells (WBC) are made by lymph nodes only.
(d) The blood has more platelets than WBCs.
Option d – The blood has more platelets than WBCs
Arteries supplying blood to the heart are called
(a) Carotid arteries
(b) Hepatic arteries
(c) Coronary arteries
(d) Pulmonary arteries
Option c – Coronary arteries
The oxygenated blood from the lungs is received by the
(a) Left auricle
(b) Left ventricle
(c) Right auricle
(d) Right ventricle
Option a – Left auricle
Which one of the following statements regarding hemoglobin is correct?
(a) Hemoglobin present in RBCs can carry only oxygen, but not carbon dioxide.
(b) Hemoglobin of RBC can carry both oxygen and carbon dioxide.
(c) Hemoglobin of RBCs can carry only carbon dioxide.
(d) Hemoglobin is only used for blood clotting and not for carrying gases.
Option b – Hemoglobin of RBC can carry both oxygen and carbon dioxide
Which one of the following statements regarding electrocardiogram is correct?
(a) An electrocardiogram is a graphical representation of the electrical activity of the cornea.
(b) An electrocardiogram is a graphical representation of the activity of the kidney.
(c) An electrocardiogram is a graphical representation of the activity of the brain.
(d) An electrocardiogram is a graphical representation of the electrical activity of the heart.
Option d – An electrocardiogram is a graphical representation of the electrical activity of the heart
What is the excretory organ in crustaceans, like prawns?
(a) Antennal glands
(b) Nephridia
(c) Flame cells
(d) Malpighian tubules
Option a – Antennal glands
Which organ in human beings carries out a function similar to what Malpighian tubules perform in cockroaches and other insects?
(a) Lungs
(b) Kidneys
(c) Heart
(d) Reproductive organs
Option b – Kidneys
In ureotelic animals, ammonia produced by metabolism is converted into urea in which organ?
(a) Kidney
(b) Liver
(c) Spleen
(d) Lungs
Option b – Liver
Flame cells or protonephridia are the excretory structures in which group of animals?
(a) Arthropods
(b) Platyhelminthes
(c) Annelids
(d) Crustaceans
Option b – Platyhelminthes
Malpighian tubules are the excretory structures of which group of animals?
(a) Insects
(b) Mammals
(c) Birds
(d) Reptiles
Option a – Insects
Which of the following is a part of the pectoral girdle?
(a) Ilium
(b) Ischium
(c) Acetabulum
(d) Glenoid cavity
Option d – Glenoid cavity
Which one of the following salts is found in the maximum amount in human bones?
(a) Magnesium Chloride
(b) Calcium Carbonate
(c) Calcium Phosphate
(d) Sodium Chloride
Option c – Calcium Phosphate
Which of the following natural substances contains iron (Fe)?
(a) Chlorophyll
(b) Collagen
(c) Carotene
(d) Myoglobin
Option d – Myoglobin
Glenoid cavity articulates
(a) Clavicle with acromion
(b) Scapula with acromion
(c) Clavicle with scapula
(d) Humerus with scapula
Option d – Humerus with scapula
The number of bones in the human skull is
(a) 28
(b) 30
(c) 32
(d) 40
Option a – 28
Pair of ribs found in humans is
(a) 10
(b) 12
(c) 14
(d) 11
Option b – 12
Which one of the following body parts/organs of the human body does not have smooth muscles?
(a) Ureters
(b) Iris of the eye
(c) Bronchi of the lungs
(d) Biceps
Option d – Biceps
In the human body, the leg bone is
(a) Hollow
(b) Porous
(c) Solid
(d) Rivet
Option a – Hollow
Which of the following is the smallest bone in the human body?
(a) Vomer
(b) Stapes
(c) Malleus
(d) Incus
Option b – Stapes
Which one is the longest bone in the human body?
(a) Femur
(b) Clavicle
(c) Tibia
(d) Ulna
Option a – Femur
Which of the following is not a function of the skeletal system?
(a) Production of erythrocytes
(b) Storage of minerals
(c) Production of body heat
(d) Locomotion
Option c – Production of body heat
What is arthroplasty in surgery?
(a) Open-heart surgery
(b) Kidney transplant
(c) Hip-joint replacement
(d) Blood transfusion
Option c – Hip-joint replacement
In the human body, what is the number of cervical vertebrae?
(a) 5
(b) 7
(c) 8
(d) 12
Option b – 7
Which of the following are required for the formation of bones and teeth?
(a) Sodium and Potassium
(b) Iron and Calcium
(c) Sodium and Calcium
(d) Calcium and Phosphorus
Option d – Calcium and Phosphorus
The bones are held together by elastic tissues called
(a) Ligaments
(b) Fibrous tissues
(c) Fibrin
(d) Muscular tissues
Option a – Ligaments
The strongest muscle in the human body is found in
(a) Jaws
(b) Thighs
(c) Neck
(d) Hands
Option a – Jaws
The cavity called acetabulum is formed by
(a) Ilium and incus
(b) Ilium and ischium
(c) Incus and ischium
(d) Ilium, ischium, and pubis
Option d – Ilium, ischium, and pubis
How many pairs of nerves arise from the human spinal cord?
(a) 13
(b) 31
(c) 33
(d) 12
Option b – 31
Schwann cells form a myelin sheath around the
(a) Dendrite
(b) Cell body
(c) Nucleus
(d) Axon
Option d – Axon
The gaps between two adjacent myelin sheaths are called
(a) Synapse
(b) Synaptic gap
(c) Nodes of Ranvier
(d) Sheath gap
Option c – Nodes of Ranvier
Which of the following are the properties of neurons?
(a) Conductivity and elasticity
(b) Excitability and elasticity
(c) Flexibility and excitability
(d) Excitability and conductivity
Option d – Excitability and conductivity
Which of the following elements is needed in the human body to transfer electrical signals by nerve cells?
(a) Lithium
(b) Sodium
(c) Rubidium
(d) Caesium
Option b – Sodium
The brain is responsible for
(a) Thinking
(b) Regulating the heartbeat
(c) Balancing the body
(d) All of the above
Option d – All of the above
The cerebellum is concerned with
(a) Contraction of voluntary muscles.
(b) Coordinating and regulating muscle tone.
(c) Maintaining posture, orientation, and equilibrium of the body.
(d) All of the above
Option d – All of the above
The inner parts of cerebral hemispheres and a group of associated deep structures like amygdala, hippocampus, etc., form a complex structure called
(a) Arbor vitae
(b) Limbic lobe/limbic system
(c) Corpora quadrigemina
(d) Reticular system
Option b – Limbic lobe/limbic system
Which one of the following depicts the correct circuit of a reflex arc?
(a) Effector → sensory neuron → spinal cord → motor neuron → receptor
(b) Receptor → sensory neuron → spinal cord → motor neuron → effector
(c) Receptor → sensory neuron → brain → motor neuron → effector
(d) Sensory neuron → receptor → brain effector → motor neuron
Option b – Receptor → sensory neuron → spinal cord → motor neuron → effector
The main thinking part of the brain is
(a) Midbrain
(b) Hypothalamus
(c) Forebrain
(d) Hindbrain
Option c – Forebrain
(a) Liver
(b) Heart
(c) Brain
(d) Artery
Option c – Brain
The largest part of the human brain is
(a) Cerebellum
(b) Cerebrum
(c) Medulla oblongata
(d) None of the above
Option b – Cerebrum
Hindbrain includes
(a) Pons
(b) Cerebellum
(c) Medulla oblongata
(d) All of the above
Option d – All of the above
Light enters the eye through a thin membrane called
(a) Retina
(b) Cornea
(c) Pupil
(d) Iris
Option b – Cornea
Human skin is
(a) A cell
(b) A tissue
(c) An organ
(d) None of these
Option c – An organ
Retina of the eye is comparable to which of the following parts of a traditional camera?
(a) Film
(b) Lens
(c) Shutter
(d) Cover
Option a – Film
The amount of light entering the eye can be controlled and regulated by
(a) Iris
(b) Cornea
(c) Pupil
(d) Retina
Option c – Pupil
The part of the human eye on which the image is formed is
(a) Pupil
(b) Cornea
(c) Retina
(d) Iris
Option c – Retina
We covered all the biology class 12 objective questions above in this post for free so that you can practice well for the exam.
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Also, check out:
- Chapter 6 Biology Class 12 Important Questions
- 12th Biology NCERT Book in Hindi
- 12th Biology Important Questions Tamil Medium
