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.241 Which one of the following has the largest population in a food chain?
A Secondary consumers
B Primary consumers
C Decomposers
D Producers
Discuss / Board
Q.242 In which year did Rudolf Virchow develop his ideas by publishing his famous formula 'Omnis cellula-e cellula', which became a part of the foundation of cell theory?
A 1830
B 1855
C 1890
D 1902
Discuss / Board
Q.243 Which of the following is a green alga found in vast masses of a variety of marine and fresh waters?
A Porphyra
B Gelidium
C Sargassum
D Cladophora
Discuss / Board
Q.244 Planaria, a type of flatworm, is well known for its ability to reproduce asexually through which process?
A Regeneration
B Binary fission
C Multiple fission
D Fragmentation
Discuss / Board
Q.245 Which organelle contains enzymes that help break down fatty acids and detoxify certain compounds in the cell?
A Peroxisome
B Vacuole
C Lysosome
D Centriole
Discuss / Board
Q.246 Spiders, scorpions, and horseshoe crabs belong to which subphylum of arthropods?
A Chelicerata
B Myriapoda
C Hexapoda
D Crustacea
Discuss / Board
Q.247 Which of the following statements regarding the role of Carbonic Anhydrase in the human body is correct
A It is primarily found in blood plasma to transport oxygen
B It catalyzes the interconversion of dissolved bicarbonates and carbon dioxide
C It is an enzyme that strictly functions in the acidic environment of the stomach
D It prevents the formation of carbaminohemoglobin in RBCs
Discuss / Board
Q.248 In the context of plant physiology what is the primary cause of Guttation
A High rate of transpiration and low root pressure
B Low rate of transpiration and high root pressure
C Excessive sunlight causing cellular leakage
D The closure of stomata during the peak afternoon hours
Discuss / Board
Q.249 Which among the following correctly explains why people with O negative blood are considered universal donors
A Their RBCs lack both A and B antigens and the Rh factor
B Their plasma lacks antibodies against A and B antigens
C They possess both A and B antigens on the surface of their erythrocytes
D The Rh factor in their blood neutralizes any recipient antibodies
Discuss / Board
Q.250 Consider the following statements regarding Mitochondria and select the incorrect one
A They are the site of aerobic respiration and ATP production
B They possess their own circular DNA and ribosomes
C The inner membrane is folded into cristae to increase surface area
D They are inherited exclusively from the paternal side in humans
Discuss / Board
Q.251 During strenuous exercise the accumulation of which substance leads to muscle fatigue and cramps
A Pyruvic acid
B Lactic acid
C Ethyl alcohol
D Carbonic acid
Discuss / Board
Q.252 Which part of the human brain is primarily responsible for maintaining posture equilibrium and muscular coordination
A Cerebrum
B Medulla Oblongata
C Cerebellum
D Hypothalamus
Discuss / Board
Q.253 Assertion A Enzymes are highly specific in their action Reason R Enzymes have specific active sites that match only certain substrates
A Both A and R are true and R is the correct explanation of A
B Both A and R are true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true
Discuss / Board
Q.254 The double helix structure of DNA is held together by which type of chemical bonds between nitrogenous bases
A Peptide bonds
B Phosphodiester bonds
C Hydrogen bonds
D Glycosidic bonds
Discuss / Board
Q.255 In an ecosystem the ten percent law related to energy transfer was proposed by
A Charles Elton
B Raymond Lindeman
C Arthur Tansley
D Eugene Odum
Discuss / Board
Q.256 Which of the following is an example of an autosomal recessive genetic disorder
A Huntingtons disease
B Sickle cell anemia
C Haemophilia
D Color blindness
Discuss / Board
Q.257 In the human digestive system the function of Bile can be best described as
A Digestion of proteins into amino acids
B Emulsification of fats and making the medium alkaline
C Conversion of starch into maltose
D Absorption of water from the large intestine
Discuss / Board
Q.258 Which phytohormone is primarily responsible for cell division and delaying senescence in plants
A Auxins
B Gibberellins
C Cytokinins
D Abscisic acid
Discuss / Board
Q.259 The primary cause of the blue baby syndrome is the presence of which pollutant in drinking water
A Fluoride
B Arsenic
C Nitrate
D Mercury
Discuss / Board
Q.260 The process of double fertilization is a characteristic feature of which group of plants
A Bryophytes
B Pteridophytes
C Gymnosperms
D Angiosperms
Discuss / Board
Q.261 Which of the following is not a function of the Liver
A Deamination of excess amino acids
B Production of Insulin
C Storage of glycogen
D Detoxification of drugs
Discuss / Board
Q.262 Kala-azar is caused by which of the following organisms
A Plasmodium
B Leishmania
C Trypanosoma
D Entamoeba
Discuss / Board
Q.263 What happens to the rate of transpiration if the atmospheric pressure decreases
A It decreases
B It increases
C It remains constant
D It first increases and then stops
Discuss / Board
Q.264 Which type of immunity is acquired by a person after recovering from a viral infection like Chickenpox
A Natural active immunity
B Natural passive immunity
C Artificial active immunity
D Artificial passive immunity
Discuss / Board
Q.265 Which of the following correctly describes the function of Osteoblasts
A Cells that break down bone tissue
B Cells that form new bone tissue
C Mature bone cells that maintain metabolism
D Cells responsible for blood clotting in marrow
Discuss / Board
Q.266 In the process of Nitrogen fixation which enzyme is responsible for converting atmospheric nitrogen into ammonia
A Nitratase
B Nitrogenase
C Ammoniase
D Nitrosomonas
Discuss / Board
Q.267 The blood vessel that carries deoxygenated blood from the lower parts of the body to the right atrium is the
A Pulmonary Vein
B Superior Vena Cava
C Inferior Vena Cava
D Aorta
Discuss / Board
Q.268 Which of the following is the final product of the anaerobic respiration process in Yeast
A Lactic acid and Energy
B Ethanol Carbon dioxide and Energy
C Pyruvate and Water
D Glucose and Oxygen
Discuss / Board
Q.269 The yellow color of urine in a healthy human is primarily due to the presence of
A Bilirubin
B Urochrome
C Creatinine
D Uric acid
Discuss / Board
Q.270 Which cell organelle is known as the 'Storage Sacs' of the cell and is very large in plant cells
A Lysosomes
B Golgi Apparatus
C Vacuoles
D Endoplasmic Reticulum
Discuss / Board

Master Biology set 1 for All Competitive Exams 2026

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