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.541 Which specific 'WBC' is involved in the secretion of Histamine Heparin and Serotonin
A Neutrophils
B Basophils
C Eosinophils
D Monocytes
Discuss / Board
Q.542 Identify the hormone that is called the 'Antagonist' to Insulin
A Thyroxine
B Glucagon
C Adrenaline
D Cortisol
Discuss / Board
Q.543 The 'Juxtaglomerular Apparatus' (JGA) in the kidney is sensitive to a drop in
A Blood pressure or GFR
B Blood glucose
C Urea concentration
D Body temperature
Discuss / Board
Q.544 Which of the following is a 'Connecting Link' between Annelids and Molluscs
A Peripatus
B Neopilina
C Archaeopteryx
D Platypus
Discuss / Board
Q.545 In the human eye 'Astigmatism' is caused by
A Weakening of the ciliary muscles
B Irregular curvature of the cornea or lens
C Elongation of the eyeball
D Opacity of the vitreous humor
Discuss / Board
Q.546 Which specific 'Cell Organelle' is responsible for the detoxification of drugs and poisons in the Liver
A Rough Endoplasmic Reticulum
B Smooth Endoplasmic Reticulum
C Golgi Apparatus
D Mitochondria
Discuss / Board
Q.547 The 'Pistil' of a flower consists of which three parts
A Anther Filament Stigma
B Stigma Style Ovary
C Sepal Petal Stamen
D Ovule Style Filament
Discuss / Board
Q.548 Which of the following describes 'Bio-accumulation' accurately
A Increase in pollutant concentration in one organism over time
B Increase in pollutant concentration as it moves up the food chain
C Rate of decay of radioactive minerals
D Growth of bacteria in a petri dish
Discuss / Board
Q.549 Identify the correctly matched 'Vitamin' and its chemical name
A Vitamin D - Retinol
B Vitamin E - Tocopherol
C Vitamin K - Calciferol
D Vitamin A - Phylloquinone
Discuss / Board
Q.550 In the human digestive system 'Lipases' break down fats into
A Amino acids
B Glucose
C Fatty acids and Glycerol
D Nucleotides
Discuss / Board
Q.551 Which of the following is an example of an 'Amphibious' plant
A Hydrilla
B Ranunculus
C Lotus
D Valisneria
Discuss / Board
Q.552 The 'Basal Body' of a cilium or flagellum is formed by
A Mitochondria
B Centriole
C Lysosome
D Nucleolus
Discuss / Board
Q.553 In humans 'Haemolysis' refers to the
A Formation of new blood cells
B Destruction of red blood cells
C Clotting of blood
D Transport of oxygen
Discuss / Board
Q.554 Identify the 'Tricky' part: Which of the following is a 'Genetic' material in some viruses but never in humans
A Single stranded DNA
B Double stranded DNA
C Double stranded RNA
D Messenger RNA
Discuss / Board
Q.555 The 'Cornea' of the human eye does not have blood vessels and receives oxygen directly from the
A Atmosphere
B Retina
C Optic nerve
D Vitreous humor
Discuss / Board
Q.556 Which among the following is a 'Non-symbiotic' nitrogen-fixing bacteria
A Rhizobium
B Azotobacter
C Frankia
D Xanthomonas
Discuss / Board
Q.557 The 'Islets of Langerhans' were named after
A Paul Langerhans
B Robert Koch
C Alexander Fleming
D Gregor Mendel
Discuss / Board
Q.558 Which hormone inhibits the secretion of 'Growth Hormone' (GH) from the pituitary
A Somatotropin
B Somatostatin
C Prolactin
D Thyroxine
Discuss / Board
Q.559 The 'Isotonic' solution for human RBCs is
A 0.1% NaCl
B 0.9% NaCl
C 5.0% NaCl
D Pure water
Discuss / Board
Q.560 Identify the 'Tricky' part: Which of the following is 'NOT' an enzyme
A Pepsin
B Trypsin
C Oxytocin
D Amylase
Discuss / Board
Q.561 The 'Kyoto Protocol' targets which of the following greenhouse gases specifically
A Argon
B Methane (CH4)
C Nitrogen (N2)
D Oxygen (O2)
Discuss / Board
Q.562 Identify the 'Application': Why is fruit kept in cold storage for a longer time
A Respiration rate increases
B Respiration rate decreases
C Ethylene production stops completely
D Sugar content increases
Discuss / Board
Q.563 Which hormone is secreted by the 'Pineal Gland' to regulate the sleep-wake cycle
A Melanin
B Melatonin
C Serotonin
D Dopamine
Discuss / Board
Q.564 In the human circulatory system the 'Heart Sounds' (Lubb-Dupp) are produced by the
A Contraction of the ventricles
B Closing of the valves
C Flow of blood in the aorta
D Relaxation of the atria
Discuss / Board
Q.565 Identify the 'Tricky' part: Which of the following is 'NOT' a primary lymphoid organ
A Bone Marrow
B Spleen
C Thymus
D None of these
Discuss / Board
Q.566 In the human eye 'Presbyopia' is a defect of vision arising due to
A Shortness of the eyeball
B Gradual weakening of ciliary muscles and decreasing flexibility of the lens
C Damage to the cornea
D Excessive curvature of the lens
Discuss / Board
Q.567 Which among the following is a 'Facultative' anaerobe
A Clostridium
B Yeast
C Escherichia coli
D Both B and C
Discuss / Board
Q.568 The 'Functional' unit of contraction in a muscle is the
A Z-line
B Sarcomere
C Myofibril
D Fascicle
Discuss / Board
Q.569 Identify the hormone responsible for 'Stress' tolerance in plants by inducing stomatal closure
A Gibberellic Acid
B Abscisic Acid
C Indole Acetic Acid
D Ethylene
Discuss / Board
Q.570 The 'Middle Ear' cavity is filled with
A Water
B Air
C Vitreous humor
D Lymph
Discuss / Board

Master Biology set 1 for All Competitive Exams 2026

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