Biology set 1 MCQs

Practice interactive objective questions for this topic. Select an option to instantly verify your answer and read detailed explanations.

Showing 605 questions
Q.481 Which of the following describes the 'Lamarckian' theory of evolution
A Natural selection of favorable traits
B Inheritance of acquired characters
C Mutation as a driver of species change
D Genetic drift in small populations
Discuss / Board
Q.482 The 'Blood Pressure' is the pressure exerted by the blood against the walls of
A Veins only
B Arteries only
C Capillaries only
D Both arteries and veins
Discuss / Board
Q.483 Identify the 'Primary' site of gaseous exchange in humans
A Trachea
B Bronchi
C Alveoli
D Nostrils
Discuss / Board
Q.484 Which enzyme is used to 'Join' DNA fragments together
A DNA Ligase
B Restriction Endonuclease
C DNA Polymerase
D Helicase
Discuss / Board
Q.485 The 'Poliomyelitis' vaccine was first developed by
A Edward Jenner
B Jonas Salk
C Louis Pasteur
D Alexander Fleming
Discuss / Board
Q.486 Which of the following is a 'Unicellular' fungus
A Mushroom
B Yeast
C Bread Mold
D Penicillium
Discuss / Board
Q.487 The 'Bending' of a plant shoot towards light is due to the accumulation of Auxin on which side
A Side facing the light
B Side away from the light (shaded side)
C Equally on both sides
D Only at the very tip
Discuss / Board
Q.488 Which part of the human brain maintains 'Homeostasis' and body temperature
A Cerebellum
B Hypothalamus
C Thalamus
D Pons
Discuss / Board
Q.489 Identify the 'Primary' pollutant in smog that causes eye irritation
A Nitrogen Gas
B PAN (Peroxyacetyl Nitrate)
C Carbon Monoxide
D Argon
Discuss / Board
Q.490 Which among the following is 'NOT' a part of a standard nucleotide
A Nitrogenous base
B Pentose sugar
C Phosphate group
D Amino acid
Discuss / Board
Q.491 The 'Cell Wall' of Diatoms is mainly composed of
A Cellulose
B Silica
C Chitin
D Pectin
Discuss / Board
Q.492 Identify the 'Hormone' responsible for the lowering of blood sugar
A Adrenaline
B Insulin
C Glucagon
D Thyroxine
Discuss / Board
Q.493 The 'Vasa Recta' is a system of capillaries associated with
A Lungs
B Nephrons
C Heart
D Brain
Discuss / Board
Q.494 Identify the 'Tricky' part: Which of the following is an 'Invertebrate' chordate
A Shark
B Hagfish
C Amphioxus
D Lamprey
Discuss / Board
Q.495 Which of the following is the 'Structural' protein of hair and nails
A Collagen
B Keratin
C Myosin
D Fibrin
Discuss / Board
Q.496 Which of the following describes the 'Chloride Shift' (Hamburger phenomenon) during CO2 transport
A Movement of Cl- from plasma into RBCs to maintain ionic balance
B Movement of Cl- from RBCs into plasma to increase pH
C Binding of Chlorine to hemoglobin to facilitate oxygen release
D Active transport of Cl- into the alveoli for gaseous exchange
Discuss / Board
Q.497 In the human eye the 'Aqueous Humor' is secreted by which structure
A Iris
B Ciliary body
C Cornea
D Lacrimal gland
Discuss / Board
Q.498 Which of the following is a 'Stop Codon' that terminates the process of protein translation
A AUG
B UAA
C GUG
D UAC
Discuss / Board
Q.499 The 'T-wave' in a standard EKG (Electrocardiogram) represents
A Atrial depolarization
B Ventricular depolarization
C Ventricular repolarization
D Atrial repolarization
Discuss / Board
Q.500 Which of the following enzymes is used as a 'Marker Enzyme' for Lysosomes
A Cytochrome oxidase
B Acid phosphatase
C DNA Polymerase
D Succinate dehydrogenase
Discuss / Board
Q.501 The 'Kranz Anatomy' is a characteristic feature of leaves in which group of plants
A C3 plants
B C4 plants
C CAM plants
D Hydrophytes
Discuss / Board
Q.502 Identify the hormone that stimulates the 'Contraction' of the gallbladder to release bile
A Gastrin
B Secretin
C Cholecystokinin (CCK)
D Enterogastrone
Discuss / Board
Q.503 Which specific part of the human 'Brain' is affected first in Alzheimer's disease
A Medulla
B Hippocampus
C Pons
D Thalamus
Discuss / Board
Q.504 The 'Pneumotaxic Center' which can moderate the functions of the respiratory rhythm center is located in
A Medulla oblongata
B Pons varolii
C Cerebellum
D Midbrain
Discuss / Board
Q.505 Identify the 'Protozoan' disease transmitted by the bite of a Sandfly
A Malaria
B Sleeping Sickness
C Kala-azar
D Giardiasis
Discuss / Board
Q.506 In the human circulatory system the 'Left Ventricle' has thicker walls than the 'Right Ventricle' because
A It needs to pump blood to the entire body against high resistance
B It contains more deoxygenated blood
C It is larger in size than the right ventricle
D It receives blood directly from the lungs
Discuss / Board
Q.507 Which of the following is a 'Second Messenger' in cellular signal transduction
A Insulin
B cAMP (Cyclic AMP)
C Thyroxine
D Glucose
Discuss / Board
Q.508 The 'Hepatopancreatic duct' opens into the duodenum and is guarded by the
A Pyloric sphincter
B Sphincter of Oddi
C Cardiac sphincter
D Ileocaecal valve
Discuss / Board
Q.509 Identify the 'Tricky' mineral element required for the photolysis of water during photosynthesis
A Magnesium
B Manganese
C Zinc
D Copper
Discuss / Board
Q.510 Which of the following diseases is characterized by the inflammation of the joints due to accumulation of 'Uric Acid' crystals
A Osteoarthritis
B Rheumatoid arthritis
C Gout
D Osteoporosis
Discuss / Board

Master Biology set 1 for All Competitive Exams 2026

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