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.301 Which of the following is responsible for the 'Earthly' smell after the first rain
A Actinomycetes
B Cyanobacteria
C Lactobacillus
D Spirogyra
Discuss / Board
Q.302 In humans the digestion of proteins starts in the
A Mouth
B Stomach
C Small Intestine
D Oesophagus
Discuss / Board
Q.303 Which of the following is known as the 'Widow's Peak' or 'Master Gland' of the endocrine system
A Adrenal
B Pituitary
C Thymus
D Thyroid
Discuss / Board
Q.304 Statement I Viruses are considered a link between living and non-living Statement II Viruses lack a cellular structure but contain genetic material
A Only Statement I is correct
B Only Statement II is correct
C Both Statements are correct
D Neither Statement is correct
Discuss / Board
Q.305 The scientific name of Vitamin B1 is
A Riboflavin
B Thiamine
C Niacin
D Pyridoxine
Discuss / Board
Q.306 Which organ is bypassed during fetal circulation in humans via the Foramen Ovale
A Liver
B Lungs
C Kidneys
D Brain
Discuss / Board
Q.307 The 'Suicidal Bags' of the cell are
A Ribosomes
B Golgi bodies
C Lysosomes
D Nucleolus
Discuss / Board
Q.308 Which of the following describes the 'Bohr Effect' in physiology
A Increase in CO2 leads to decreased affinity of hemoglobin for oxygen
B Increase in O2 leads to decreased affinity of hemoglobin for CO2
C Effect of pressure on solubility of gases in blood
D Movement of chloride ions into RBCs
Discuss / Board
Q.309 In Mendel's experiments the recessive trait is expressed only in
A Heterozygous condition
B Homozygous condition
C F1 generation always
D Both homozygous and heterozygous conditions
Discuss / Board
Q.310 Which among the following is the largest gland in the human body
A Thyroid
B Pancreas
C Liver
D Adrenal
Discuss / Board
Q.311 The movement of sunflower towards the sun is an example of
A Phototropism
B Hydrotropism
C Thigmotropism
D Geotropism
Discuss / Board
Q.312 Identify the non-communicable disease from the following
A Tuberculosis
B Cholera
C Diabetes
D Influenza
Discuss / Board
Q.313 What is the primary function of the Eustachian tube in the human ear
A To magnify sound vibrations
B To equalize air pressure on both sides of the eardrum
C To maintain body balance
D To secrete earwax
Discuss / Board
Q.314 Which component of blood plays a vital role in blood clotting at the site of injury
A Erythrocytes
B Leukocytes
C Thrombocytes
D Plasma Proteins
Discuss / Board
Q.315 The 'Laws of Inheritance' were formulated by
A Darwin
B Mendel
C Lamarck
D De Vries
Discuss / Board
Q.316 In a plant cell the enzymes for 'Photorespiration' are found in
A Chloroplast Mitochondria and Peroxisomes
B Chloroplast and Mitochondria only
C Mitochondria and Ribosomes
D Chloroplast and Lysosomes
Discuss / Board
Q.317 Which of the following is a symptom of Hemophilia
A Inability to see in dim light
B Delay in blood clotting after injury
C Softening of bones
D Swelling of thyroid gland
Discuss / Board
Q.318 The total number of bones in a human adult skeleton is
A 300
B 206
C 210
D 180
Discuss / Board
Q.319 Biological magnification is a phenomenon where
A Cells increase in size under a microscope
B Concentration of a toxicant increases at successive trophic levels
C Population of a species increases exponentially
D Microbes decompose organic waste rapidly
Discuss / Board
Q.320 Which hormone regulates the 'Milk Ejection Reflex' during breastfeeding
A Prolactin
B Estrogen
C Oxytocin
D Progesterone
Discuss / Board
Q.321 The conversion of glucose to glycogen for storage in liver and muscles is stimulated by
A Glucagon
B Insulin
C Cortisol
D Somatostatin
Discuss / Board
Q.322 During the process of Osmosis water moves from
A Higher solute concentration to lower solute concentration
B Lower solute concentration to higher solute concentration
C Hypertonic solution to Hypotonic solution
D Higher pressure to lower pressure regardless of solute
Discuss / Board
Q.323 Which of the following is not a part of the human small intestine
A Duodenum
B Jejenum
C Ileum
D Caecum
Discuss / Board
Q.324 The phenomenon of 'Industrial Melanism' in peppered moths Biston betularia is an example of
A Natural Selection
B Genetic Drift
C Mutation
D Artificial Selection
Discuss / Board
Q.325 What is the typical lifespan of a human Red Blood Cell RBC
A 30 days
B 120 days
C 60 days
D 200 days
Discuss / Board
Q.326 The 'Elisa' test is commonly used to screen for which of the following infections
A Typhoid
B AIDS
C Tuberculosis
D Malaria
Discuss / Board
Q.327 Which of the following is an example of an Endocrine gland as well as an Exocrine gland
A Thyroid
B Pancreas
C Pituitary
D Parathyroid
Discuss / Board
Q.328 In humans the main nitrogenous waste excreted in urine is
A Ammonia
B Uric acid
C Urea
D Creatine
Discuss / Board
Q.329 The study of the relationship between organisms and their environment is known as
A Entomology
B Ecology
C Ethology
D Cytology
Discuss / Board
Q.330 Which of the following is known as 'The Royal Disease'
A Diabetes
B Hemophilia
C Cancer
D Leukemia
Discuss / Board

Master Biology set 1 for All Competitive Exams 2026

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