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.421 Which among the following is a 'Fossil Fuel' but originated from biological remains
A Uranium
B Coal
C Bauxite
D Iron Ore
Discuss / Board
Q.422 The 'Nodes of Ranvier' are found in which part of the neuron
A Cell body
B Dendrites
C Axon
D Synapse
Discuss / Board
Q.423 Identify the primary site of 'Hematopoiesis' (blood cell formation) in an adult human
A Spleen
B Liver
C Red Bone Marrow
D Thymus
Discuss / Board
Q.424 Which phytohormone is often called the 'Stress Hormone' in plants
A Auxin
B Gibberellin
C Abscisic Acid
D Cytokinin
Discuss / Board
Q.425 The 'Endosymbiotic Theory' suggests that Mitochondria evolved from
A Free-living aerobic bacteria
B Cyanobacteria
C Viruses
D Fungi
Discuss / Board
Q.426 Which of the following is a symptom of 'Ariboflavinosis'
A Night blindness
B Bleeding gums
C Cracking at the corners of the mouth (Cheilosis)
D Pellagra
Discuss / Board
Q.427 The 'Glomerular Filtration Rate' (GFR) in a healthy human adult is approximately
A 125 ml/min
B 500 ml/min
C 1000 ml/min
D 50 ml/min
Discuss / Board
Q.428 In the context of the environment what does 'Eutrophication' refer to
A Depletion of oxygen in water due to chemical pollutants
B Nutrient enrichment of water bodies leading to algal bloom
C Increase in water temperature due to global warming
D Acidification of water bodies by acid rain
Discuss / Board
Q.429 Which hormone regulates the 'Calcium' level in the blood by increasing it
A Calcitonin
B Parathyroid Hormone
C Thyroxine
D Insulin
Discuss / Board
Q.430 In humans the 'Fovea Centralis' is the region of the retina where
A Only rod cells are present
B The optic nerve exits the eye
C Visual acuity is highest due to high cone density
D The image is always inverted
Discuss / Board
Q.431 Which of the following describes 'Aneuploidy'
A Presence of an exact multiple of the haploid set
B Loss or gain of one or more individual chromosomes
C Exchange of segments between non-homologous chromosomes
D Complete set of chromosomes from two different species
Discuss / Board
Q.432 The 'Lenticels' in woody plants are primarily used for
A Photosynthesis
B Water absorption
C Gaseous exchange
D Sugar transport
Discuss / Board
Q.433 Which among the following is a 'Polysaccharide'
A Glucose
B Sucrose
C Glycogen
D Lactose
Discuss / Board
Q.434 Identify the 'Double-Membrane' bound organelle from the following
A Lysosome
B Ribosome
C Nucleus
D Vacuole
Discuss / Board
Q.435 The movement of 'Stomata' is regulated by the movement of ions into and out of
A Subsidiary cells
B Guard cells
C Epidermal cells
D Mesophyll cells
Discuss / Board
Q.436 Which disease is known as the 'Breakbone Fever'
A Malaria
B Dengue
C Chikungunya
D Typhoid
Discuss / Board
Q.437 The 'Primary Endosperm Nucleus' in angiosperms is
A Haploid
B Diploid
C Triploid
D Tetraploid
Discuss / Board
Q.438 Which of the following describes the 'All-or-None' law in physiology
A A muscle fiber contracts completely or not at all in response to a threshold stimulus
B Every neuron in a nerve fires simultaneously
C The strength of a heart beat is independent of the stimulus
D A cell produces all its enzymes at once
Discuss / Board
Q.439 Which of the following is the 'Fastest' way of CO2 transport in the blood
A As dissolved CO2 in plasma
B As Bicarbonate ions
C As Carbaminohemoglobin
D As Carbon Monoxide
Discuss / Board
Q.440 Identify the 'Connecting Link' between Annelida and Arthropoda
A Peripatus
B Neopilina
C Echidna
D Balanoglossus
Discuss / Board
Q.441 The 'Islets of Langerhans' contain which cells for secreting Glucagon
A Beta cells
B Alpha cells
C Delta cells
D Gamma cells
Discuss / Board
Q.442 Which among the following is a 'Complete' parasite
A Loranthus
B Viscum
C Cuscuta (Dodder)
D Santalum
Discuss / Board
Q.443 The 'Blood-Brain Barrier' (BBB) is primarily composed of which type of cells
A Neurons
B Astrocytes and specialized capillaries
C Schwann cells
D Microglia
Discuss / Board
Q.444 Which of the following hormones is known as 'Birth Hormone' and 'Milk Let-down' hormone
A Prolactin
B Oxytocin
C Vasopressin
D Relaxin
Discuss / Board
Q.445 Which 'Enzyme' is used in the industry to dissolve blood clots
A Streptokinase
B Cyclosporin A
C Statins
D Lipase
Discuss / Board
Q.446 In the human skeletal system the 'Hinge Joint' is found in
A Shoulder
B Elbow and Knee
C Neck
D Wrist
Discuss / Board
Q.447 The 'Widal Test' is used for the diagnosis of
A Tuberculosis
B Cholera
C Typhoid
D Malaria
Discuss / Board
Q.448 Which part of the 'Nephron' is impermeable to water
A Descending limb of Loop of Henle
B Ascending limb of Loop of Henle
C Collecting duct
D Proximal tubule
Discuss / Board
Q.449 Which of the following is a 'Nitrogen-Fixing' free-living aerobic bacterium
A Rhizobium
B Azotobacter
C Clostridium
D Anabaena
Discuss / Board
Q.450 The 'Double Helix' model of DNA suggests that the two strands are
A Parallel and identical
B Antiparallel and complementary
C Single stranded and linear
D Coiled but not bonded
Discuss / Board

Master Biology set 1 for All Competitive Exams 2026

Practicing Biology set 1 MCQs is one of the most effective ways to prepare for competitive examinations in 2026. This topic-wise question bank contains carefully selected multiple-choice questions designed to strengthen conceptual understanding, improve accuracy, and enhance problem-solving speed. Our collection includes beginner, intermediate, and advanced-level questions frequently asked in JKSSB, SSC, Banking, Railway, Police, Defence, State PSC, and various national-level examinations. Every question is structured to reflect real exam patterns and helps candidates become familiar with objective-type assessment formats. Instant answer verification enables students to identify mistakes immediately and learn the correct approach without wasting valuable preparation time. Regular practice of topic-wise MCQs improves retention, reinforces key concepts, and develops confidence required to perform well under exam pressure. Whether you are revising important concepts, preparing for an upcoming recruitment test, or strengthening weak areas, these practice questions provide a reliable platform for continuous improvement. Consistent participation in MCQ-based learning sessions can significantly increase your chances of achieving higher scores and better ranks in competitive examinations.

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