Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- In plants, the neighbouring cells are connected with one another by. 

a. Plasmodesmata 

b. Cell walls 

c. Vacuoles 

d. Both 'a' & 'b' 


Answer- Both 'a' & 'b'


Que- In the root cells _______ pathway becomes discontinuous in the endodermis due to the presence of casparian strip. 

a. Tonoplast 

b. Apoplast 

c. Symplast 

d. Vacuolar. 


Answer- Apoplast


Que- Cytoplasmic strands that extend through pores in adjacent cell walls are known as 

a. Pseudopods 

b. Symplasts 

c. Plasmodesmata 

d. Pili 


Answer- Plasmodesmata


Que- In plants, water potential is determined by major factors. 

a. Three 

b. Four 

c. Two 

d. Five 


Answer- Two


Que- The pressure generated when water enters & inflates plant cells is called ______ potential 

a. Water 

b. Osmotic 

c. Pressure 

d. Solute 


Answer- Pressure


Que- The movement of water molecules from a region of higher water potential to a region of lower water potential (through membrane) 

a. Deffusion 

b. Osmosis 

c. Active transport 

d. None of these 


Answer- Osmosis


Que- _______ potential is the measure of the change in water potential of a system due to the presence of solute molecules. 

a. Osmotic 

b. Pressure 

c. Both of these 

d. None of these 


Answer- Osmotic


Que- _______ component of cell wall has grreat affinity with water. 

a. Lignin 

b. Cellulose 

c. Pectin 

d. All of these 


Answer- All of these


Que- Commonly in other plants than tall ones the speed of upward movement of water is 

a. 8mh-1 

b. 1 mh-1 

c. 7 mh-1 

d. 4 mh-1 


Answer- 1 mh-1


Que- Exceptionally the positive hydrostatic pressure generated by root pressure is about 

a. 600 Kpa 

b. 800 Kpa 

c. 1000 Kpa 

d. 900 Kpa 


Answer- 800 Kpa


Que- Cuticular transpiration is ______ of total transpiration 

a. 6-8% 

b. 5-7% 

c. 7-9% 

d. 4-6% 


Answer- 5-7%


Que- All plants do not possess 

a. Lenticels 

b. Cuticle 

c. Stomata 

d. All of these 


Answer- Lenticels


Que- Lenticular transpiration is _________ of total transpiration 

a. 2-3% 

b. 1-3% 

c. 1-4% 

d. 1-2% 


Answer- 1-2%


Que- Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are 

a. Hydathods 

b. Stomata 

c. Lenticels 

d. None of these 


Answer- Lenticels


Que- Lenticels look like 

a. A big pore 

b. Stoma 

c. Sponge 

d. Cars or small protusions 


Answer- Cars or small protusions


Que- Stomatal transpiration is _____ of total transpiration 

a. 0.9 

b. 0.91 

c. 0.93 

d. 0.95 


Answer- 0.9


Que- They function as multisensory hydraulic valve 

a. Lenticels 

b. Guard cells 

c. Hydathods 

d. All of these 


Answer- Guard cells


Que- There are _______ hypothesis which may explain opening and closing of stomata 

a. One 

b. Two 

c. Three 

d. Four 


Answer- Two


Que- Stomata open due to _____ of K+ into the guard cells from the surrounding epidermis 

a. Diffusion 

b. Active transport 

c. Osmosis 

d. All of these 


Answer- Active transport


Que- Low level of CO2 favours _____ of the stomata 

a. Opening 

b. Closure 

c. Both of these 

d. None of these 


Answer- Opening


Que- The opening and closing of stomata is directly controlled by the 

a. Temperature 

b. pH 

c. Light 

d. None of these 


Answer- Light


Que- Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper. 

a. Bacteria. 

b. Viruses 

c. Fungi. 

d. Cyanobacteria. 


Answer- Fungi.


Que- Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called: 

a. Diffusion. 

b. Facilitated diffusion. 

c. Passive transport. 

d. Active transport. 


Answer- Facilitated diffusion.


Que- Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called 

a. Transpiration pull 

b. Root pressure 

c. Ascent of sap. 

d. All of these 


Answer- Transpiration pull


Que- Pressure flow theory was proposed by 

a. H-Van Mohl 

b. Dixon 

c. Vander wall. 

d. Earnst Munch 


Answer- Earnst Munch


Que- A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called 

a. Transpiration pull 

b. Root pressure 

c. Osmotic pressure. 

d. None of these 


Answer- Root pressure


Que- Addition of salts and other solutes from other cells into xylem sap, _____ the water potential of the xylem sap 

a. Increases. 

b. Lowers. 

c. Doesn't effect. 

d. Maintains. 


Answer- Lowers.


Que- Open circulatory system can contain 

a. Red Blood Cells 

b. White Blood Cells 

c. Haemoglobin 

d. All of these 


Answer- White Blood Cells


Que- Which of the following is true about hearts of earthworm? 

a. There are 5-7 pairs of heart. 

b. They are present between 1-7th segments. 

c. They are present lateral to the oesophagus. 

d. They pump blood from ventral to dorsal vessel. 


Answer- They are present lateral to the oesophagus.


Que- Single circuit heart is found in 

a. Fishes 

b. Amphibians 

c. Reptiles 

d. Mammals 


Answer- Fishes


Que- It has been estimated that in a normal person plasma constitutes about ____ by vulume of blood. 

a. 0.35 

b. 0.45 

c. 0.55 

d. 0.75 


Answer- 0.55


Que- 95% of the cytoplasm ofred blood cells is the 

a. Antibodies 

b. Haemoglobin 

c. Enzymes 

d. Proteins 


Answer- Haemoglobin


Que- _______ give rise to macrophages, which destroy larger particles by phagocytosis. 

a. Nautrophils 

b. Basophila 

c. Monocyte 

d. Lymphocyte 


Answer- Monocyte


Que- Which of the following are proteins in nature? 

a. Antibodies. 

b. Interferons 

c. Antitoxins 

d. All of these 


Answer- All of these


Que- Cooley's anemia is another name used for 

a. Leucemia 

b. Thalassaemia 

c. Sickle cell anemia 

d. None of these 


Answer- Thalassaemia


Que- Tricuspid valve is present 

a. Between right atrium and right ventricle 

b. Between left atrium and left ventricle 

c. At base of pulmonary artery 

d. At base of aorta 


Answer- Between right atrium and right ventricle


Que- QRS complex represents 

a. Atrial systole 

b. Ventricular systole 

c. Atrial diastole 

d. Ventricular diastole 


Answer- Ventricular systole


Que- Which of the following have thickest walls? 

a. Arteries 

b. Veins 

c. Capillaries 

d. None of these 


Answer- Arteries


Que- It is the measure of force with which blood pushes up against the walls of blood vessels. 

a. Stroke volume 

b. Cardiac output 

c. Blood pressure 

d. Blood flow 


Answer- Blood pressure


Que- All of the follwing are blood clots except 

a. Thrombus 

b. Embolus 

c. Atheroma 

d. Hematoma 


Answer- Atheroma


Que- It is the discharge of blood from blood vessels. 

a. Myocardial infarction 

b. Cerebral infarction 

c. Cerebral Hemorrhage 

d. Thromboembolism 


Answer- Cerebral Hemorrhage


Que- The flow of lymph is maintained by 

a. Movement of viscera 

b. Breathing movements 

c. Valves 

d. All of these 


Answer- All of these


Que- Introduction of vaccine within the body to produce immunity is an example of 

a. Artificially induced active immunity 

b. Naturally induced active immunity 

c. Artificially induced passive immunity 

d. Naturally induced passive immunity 


Answer- Artificially induced active immunity


Que- The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called 

a. Homeostasis 

b. Hemostasis 

c. Osmoregualtion 

d. Thermoregulation 


Answer- Osmoregualtion


Que- In a hot summer after noon, if your body's Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of 

a. Positive feed back 

b. Negative feed back 

c. Feed back 

d. Osmoregulation 


Answer- Negative feed back


Que- In osmosis water molecules move from area of _______ to _______ through semipermeable memberane 

a. Higher solute concentration to lower solute concentration 

b. Lower solute concentration to higher solute concentration 

c. Lower solvent concentration to higher solvent concentration 

d. All of these 


Answer- Lower solute concentration to higher solute concentration


Que- Which of the following represents osmoregulatory steps taken by hydrophytes? 

a. Increases transpiration by increasing the surface area of the leave. 

b. Small and thick leaves to decrease the surface area proportional to the volume of the leave. 

c. Stomata closing in sufficient supply, and opening in restricted supply of water. 

d. None of these 


Answer- Increases transpiration by increasing the surface area of the leave.


Que- Thick, waxy & leathery cuticle around leaves is present in 

a. Hydrophytes 

b. Mesophytes 

c. Xerophytes 

d. Halophytes 


Answer- Xerophytes


Que- Rose is an example of 

a. Hydrophytes 

b. Mesophytes 

c. Xerophytes 

d. Halophytes 


Answer- Mesophytes


Que- Most of the marine invertebrates are 

a. Osmoconformers 

b. Osmoregulators 

c. Both depend upon the concentration of sea water 

d. None of these 


Answer- Osmoconformers


Que- Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss? 

a. Hagfish 

b. Fresh water fishes 

c. Bony fishes 

d. None of these 


Answer- Bony fishes


Que- Which of the following marine fishes are considered direct descendents of fresh water ancestors? 

a. Hagfish 

b. Jelly Fish 

c. Star Fish 

d. Bony fishes 


Answer- Bony fishes


Que- Which of the following fishes excrete large volume of diluted urine? 

a. Bony Marine fishes 

b. Fresh water fishes 

c. Both depending upon the surrounding water 

d. None of these 


Answer- Fresh water fishes


Que- Terrestrial animals like kangaroo rat survive even without drinking water since 

a. They don't require water for their metabolic process 

b. They can retain excessive water in their body during raining season. 

c. They feed on carbohydrate rich seeds which can provide them with metabolic water 

d. They are anhydrobiotic organisms 


Answer- They are anhydrobiotic organisms


Que- The characteristic which enable animals to tolerate dehydration is called 

a. Osmoconformation 

b. Osmoregulaton 

c. Anhydrobiosis 

d. Anhydrosis 


Answer- Anhydrobiosis


Que- Which excretory product in produced in plants during autotrophic mode of life? 

a. CO2 

b. H2O 

c. O2 

d. Both A and B 


Answer- O2


Que- In plants which of the following is a waste product produced both during photosynthesis and respiration 

a. CO2 

b. H2O 

c. O2 

d. Both A and B 


Answer- H2O


Que- Which of the following structure in plant's body is called excretophores? 

a. Stem 

b. Leaves 

c. Flowers 

d. Roots 


Answer- Leaves


Que- In animals excess of nitrogen is excreted primarily in form of 

a. Creatinine 

b. Trimethyamine oxide 

c. Pyrimidine 

d. Ammonia 


Answer- Ammonia


Que- Purine and pyrimidine catabolism results in production of 

a. Creatinine 

b. Trimethyamine oxide 

c. Xanthine 

d. None of these 


Answer- Xanthine


Que- Which of the following is most toxic? 

a. Ammonia. 

b. Urea 

c. Uric acid 

d. Trimethylamine oxide 


Answer- Ammonia.


Que- Aquatic animals excrete nitrogenous waste commonly in the form of 

a. Ammonia. 

b. Urea 

c. Uric acid 

d. Trimethylamine oxide 


Answer- Ammonia.


Que- Amount of water required to excrete 1gN of Urea is 

a. 1 ml 

b. 50 ml 

c. 100 ml 

d. 150 ml 


Answer- 50 ml


Que- Which of the following animal excrete nitrogenous waste mainly as uric acid? 

a. Hydra 

b. Planaria. 

c. Humans 

d. Birds. 


Answer- Birds.


Que- Hydra has no specialized excretory system because 

a. It does not produce waste material 

b. Due to absence of mesoderm 

c. The whole body cells are in contact with water 

d. It has pseudocoelom. 


Answer- The whole body cells are in contact with water


Que- Each ach nephridium of earthworm opens to the exterior by 

a. Nephrostome 

b. Nephridiopore 

c. Flame cell 

d. Anus 


Answer- Nephridiopore


Que- The nephridia of earthworm open into the coelom by 

a. Nephrostome 

b. Nephridiopore 

c. Flame cell 

d. Anus 


Answer- Nephrostome


Que- Which of the following openings have cilia? 

a. Nephrostome 

b. Nephridiopore 

c. Both of these 

d. None of these 


Answer- Nephrostome


Que- The distal blind end of the malpighian tubules bathes freely in 

a. Digestive tract 

b. Intestines 

c. Haemocoel 

d. Coelom 


Answer- Haemocoel


Que- The main nitrogenous waste formed in the body of earthworm is/are 

a. Ammonia 

b. Urea 

c. Uric acid 

d. Trimethylamine oxide 


Answer- Urea


Que- Protonephridia are present in 

a. Round worms 

b. Flateworm 

c. Tape worms 

d. Segmented worms 


Answer- Flateworm


Que- Nephrostome in earthworm opens in 

a. External space 

b. Internal Body cavity 

c. In gut 

d. In Bladder 


Answer- Internal Body cavity


Que- Which of the following excretory structure is associated with gut of the organism? 

a. Protonephridium 

b. Metanephridium 

c. Malpighian tubules 

d. Nephrons 


Answer- Malpighian tubules


Que- Malphighian tubules absorb waste materials and salts from 

a. Blood 

b. Lymph 

c. Gut 

d. Hemolymph 


Answer- Hemolymph


Que- Which of the following is a segmentally arranged excretory system? 

a. Protonephridium 

b. Metanephridium 

c. Malpighian tubules 

d. Nephrons 


Answer- Metanephridium


Que- In Urea cycle ______ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea. 

a. 1.0 

b. 2.0 

c. 3.0 

d. 4.0 


Answer- 2.0


Que- Excessive lactic acid is converted into ________ by liver. 

a. Glucose 

b. Fructose 

c. Sucrose 

d. Glycogen 


Answer- Glycogen


Que- Each human kidney receives _____ % of total cardiac out put 

a. 0.1 

b. 0.2 

c. 0.3 

d. 0.4 


Answer- 0.2


Que- Which of the following nephrons play important role in production of concentrated urine? 

a. Crotical 

b. Medullary 

c. Juxtramedullary 

d. None of these 


Answer- Juxtramedullary


Que- Which of the vascular channels are related to Juxtramedullary nephrous only? 

a. Afferent and efferent arterioles 

b. Peritubualr capillaries 

c. Vasa nervosa 

d. Vasa recta 


Answer- Vasa recta


Que- Which of the following filtrate contains excessive amount of amino acids, glucose, and salts? 

a. Glomerular filtrate 

b. Filtrate passing through ascending limb 

c. Filtrate passing through distal conveluted tubule 

d. Filtrate passing through collecting tubules 


Answer- Glomerular filtrate


Que- Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules 

a. Glucose 

b. Amino acids 

c. Nitrogenous waste 

d. All of these 


Answer- Nitrogenous waste


Que- On which of the following site the posterior pituitary hormone acts predominantly 

a. Proximal convoluted tubule 

b. Descending limb of loop of Henle 

c. Ascending limb of loop of Henle 

d. Collecting tubules 


Answer- Collecting tubules


Que- Which of the following kidney stones are most common? 

a. Calcium oxalate 

b. Calcium phosphate 

c. Uric acid 

d. All of these 


Answer- Calcium oxalate


Que- A stone measuring 0.4 cm, blocking the outlet of renal pelvis resulting in mild to moderate tract obstruction. Which of the following technique will be opted to remove this stone 

a. Kidney surgery 

b. Burring a hole and removing the stone manually (nephrolithotomy) 

c. Extracorporeal Shock wave lithotripsy 

d. None of these 


Answer- Extracorporeal Shock wave lithotripsy


Que- Which of the following mechanism explains development of anemia in Renal failure? 

a. Failure of bone marrow is accompanied with renal failure. 

b. Destruction of RBC results from accumulated urea in the blood. 

c. Chronicity of the disease is respobsible for anemia 

d. Failure of proper RBC synthesis, due to lack of chemical stimulation. 


Answer- Failure of proper RBC synthesis, due to lack of chemical stimulation.


Que- Which of the following treatment will be administered first in a newly diagnosed renal failure patient? 

a. Renal transplant 

b. Peritoneal Dialysis 

c. Lithotripsy 

d. Hemodialysis 


Answer- Hemodialysis


Que- Formation of heat shock proteins in plants results in 

a. Elevation of temperature in cold conditions. 

b. Embracing the enzymes and other proteins and prevent their denaturation. 

c. Change the chemical nature of other proteins thus making them heat resistant. 

d. Help in evaporative cooling. 


Answer- Embracing the enzymes and other proteins and prevent their denaturation.


Que- Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane? 

a. Change in membrane protein composition. 

b. Change in the solute composition of the cell membrane which prevents crystallization. 

c. Increase in proportion of unsaturated fatty acids. 

d. Development of heat shock proteins. 


Answer- Increase in proportion of unsaturated fatty acids.


Que- Animals that produce metabolic heat at low level and also absorb heat from the surroundings are called 

a. Endotherms 

b. Ectotherms 

c. Heterotherms 

d. Homeotherms 


Answer- Heterotherms


Que- Fishes, most of the invertebrates and amphibians are examples of ______ animals 

a. Endotherms 

b. Ectotherms 

c. Heterotherms 

d. Homeotherms 


Answer- Ectotherms


Que- Bats & humming birds belong to 

a. Endotherms 

b. Ectotherms 

c. Heterotherms 

d. Homeotherms 


Answer- Heterotherms


Que- Brown fat present in certain mammals is specialized in 

a. Providing insulation in cold environment. 

b. Providing insulation in hot environment 

c. Rapid heat production. 

d. Controlling heat production. 


Answer- Rapid heat production.


Que- Blubber a thick layer of fat is present in 

a. Fresh water mammals. 

b. Terrestrial mammals. 

c. Marine Mammals. 

d. Flying mammals. 


Answer- Marine Mammals.


Que- Panting is a representative of which mechanism 

a. Pigmentation. 

b. Respiration. 

c. Evaporative cooling. 

d. Excretion. 


Answer- Evaporative cooling.


Que- Thermostat of human body is present in 

a. Fore brain. 

b. Hind Brain. 

c. Thalamus. 

d. Hypothalamus. 


Answer- Hypothalamus.


Que- Production of pyrogens is a ________ phenomenon 

a. Protective 

b. Destructive 

c. Constructive 

d. Aggressive 


Answer- Protective


Que- Name the type of adaptation from the following that is responsible for shivering thermogenesis 

a. Structural 

b. Physiological 

c. Behavioral. 

d. None of these 


Answer- Behavioral.


Que- The one which is present in all living things 

a. Cell nucleus 

b. DNA or RNA 

c. Cell membrane 

d. Vacuole 


Answer- DNA or RNA


Que- The mechanism of stomatal movement is related to the branch of Biology called 

a. Taxonomy 

b. Physiology 

c. Morphology 

d. Anatomy 


Answer- Physiology

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