Biology Class 12 Objective Questions

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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

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(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

The cerebrum is related to

(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

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