Biology Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Biology Mcqs “. Tab this page to check “Latest Biology MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Biology in past papers. Past papers of Biology mcqs. Past papers of Biology MCQs. Biology Mcqs are the necessary part of any competitive / job related exams. The Biology mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Biology mcqs. The Important series of Biology Mcqs are given below:
Tricuspid valve is present_____________?
A. Between right atrium and right ventricle
B. At base of aorta
C. At base of pulmonary artery
D. Between left atrium and left ventricle
Cooley’s anemia is another name used for___________?
A. Sickle cell anemia
B. Thalassaemia
C. Leucemia
D. None of these
Which of the following are proteins in nature?
A. Interferons
B. Antibodies.
C. Antitoxins
D. All of these
Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?
A. Stomata
B. Hydathods
C. Lenticels
D. None of these
Lenticels look like__________?
A. Stoma
B. A big pore
C. Sponge
D. Cars or small protusions
Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?
A. Passive transport.
B. Facilitated diffusion.
C. Diffusion.
D. Active transport.
Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called__________?
A. Transpiration pull
B. Ascent of sap.
C. Root pressure
D. All of these
A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?
A. Osmotic pressure.
B. Root pressure
C. Transpiration pull
D. None of these
Stomatal transpiration is __________ of total transpiration
A. 90%
B. 93%
C. 91%
D. 95%
___________ function as multisensory hydraulic valve?
A. Hydathods
B. Guard cells
C. Lenticels
D. All of these
_________ give rise to macrophages, which destroy larger particles by phagocytosis.
A. Basophila
B. Nautrophils
C. Monocytes
D. Lymphocyte
95% of the cytoplasm of red blood cells is the___________?
A. Enzymes
B. Hemoglobin
C. Antibodies
D. Proteins
Open circulatory system can contain_________?
A. Haemoglobin
B. White Blood Cells
C. Red Blood Cells
D. All of these
Pressure flow theory was proposed by_________?
A. Dixon
B. H-Van Mohl
C. Vander wall.
D. Earnst Munch
The opening and closing of stomata is directly controlled by the___________?
A. pH
B. Temperature
C. Light
D. None of these
There are _________ hypothesis which may explain opening and closing of stomata?
A. Three
B. Two
C. One
D. Four
Low level of CO2 favours _________ of the stomata.
A. Closure
B. Opening
C. Both of these
D. None of these
Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.
A. Viruses
B. Bacteria
C. Fungi
D. Cyanobacteria
Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap
A. Doesn’t effect.
B. Lowers.
C. Increases.
D. Maintains.
Single circuit heart is found in_________?
A. Fishes
B. Reptiles
C. Amphibians
D. Mammals
Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis
A. Osmosis
B. Active transport
C. Diffusion
D. All of these
Which of the following is true about hearts of earthworm?
A. They are present between 1-7th segments.
B. There are 5-7 pairs of heart.
C. They are present lateral to the oesophagus.
D. They pump blood from ventral to dorsal vessel.
It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.
A. 45%
B. 35%
C. 55%
D. 75%
Brown fat present in certain mammals is specialized in___________?
A. Controlling heat production.
B. Providing insulation in hot environment
C. Rapid heat production.
D. Providing insulation in cold environment.
Panting is a representative of which mechanism?
A. Respiration.
B. Pigmentation.
C. Evaporative cooling.
D. Excretion.
Formation of heat shock proteins in plants results in___________?
A. Help in evaporative cooling.
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. Elevation of temperature in cold conditions.
Fishes, most of the invertebrates and amphibians are examples of ________ animals?
A. Heterotherms
B. Ectotherms
C. Endotherms
D. Homeotherms
The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?
A. Hemostasis
B. Homeostasis
C. Osmoregualtion
D. Thermoregulation
Which of the following represents osmoregulatory steps taken by hydrophytes?
A. Increases transpiration by increasing the surface area of the leave.
B. Stomata closing in sufficient supply, and opening in restricted supply of water.
C. Small and thick leaves to decrease the surface area proportional to the volume of the leave.
D. None of these
Most of the marine invertebrates are__________?
A. Osmoconformers
B. Both depend upon the concentration of sea water
C. Osmoregulators
D. None of these
Which of the following marine fishes are considered direct descendents of fresh water ancestors?
A. Jelly Fish
B. Hagfish
C. Star Fish
D. Bony fishes
Which excretory product in produced in plants during autotrophic mode of life?
A. H2O
B. CO2
C. O2
D. Both A and B
Which of the following statement about conifers is correct?
A. Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
B. Production of black wood in the center.
C. Accumulate waste in leaves, which fall in autumn.
D. Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.
Purine and pyrimidine metabolism results in production of____________?
A. Trimethyamine oxide
B. Creatinine
C. Xanthine
D. None of these
Amount of water required to excrete 1gN of Urea is_________?
A. 100 ml
B. 50 ml
C. 1 ml
D. 150 ml
Each ach nephridium of earthworm opens to the exterior by__________?
A. Flame cell
B. Nephridiopore
C. Nephrostome
D. Anus
The main nitrogenous waste formed in the body of earthworm is/are___________?
A. Uric acid
B. Urea
C. Ammonia
D. Trimethylamine oxide
Which of the following excretory structure is associated with gut of the organism?
A. Metanephridium
B. Protonephridium
C. Malpighian tubules
D. Nephrons
Which of the following nephrons play important role in production of concentrated urine?
A. Medullary
B. Crotical
C. Juxtramedullary
D. None of these
Which of the following kidney stones are most common?
A. Calcium oxalate
B. Uric acid
C. Calcium phosphate
D. All of these
Which of the following treatment will be administered first in a newly diagnosed renal failure patient?
A. Peritoneal Dialysis
B. Renal transplant
C. Lithotripsy
D. Hemodialysis
In plants, which of the following is a waste product produced both during photosynthesis and respiration?
A. O2
B. H2O
C. CO2
D. Both A and B
In animals excess of nitrogen is excreted primarily in form of___________?
A. Trimethyamine oxide
B. Creatinine
C. Pyrimidine
D. Ammonia
Hydra has no specialized excretory system because:
A. Due to absence of mesoderm
B. It does not produce waste material
C. The whole body cells are in contact with water
D. It has pseudocoelom.
The distal blind end of the malpighian tubules bathes freely in____________?
A. Intestines
B. Digestive tract
C. Haemocoel
D. Coelom
Which of the following is a sentimentally arranged excretory system?
A. Malpighian tubules
B. Metanephridium
C. Protonephridium
D. Nephrons
Excessive lactic acid is converted into __________ by liver?
A. Fructose
B. Glucose
C. Sucrose
D. Glycogen
Each human kidney receives _______% of total cardiac out put?
A. 30%
B. 20%
C. 10%
D. 40%
On which of the following site the posterior pituitary hormone acts predominantly?
A. Ascending limb of loop of Henle
B. Descending limb of loop of Henle
C. Proximal convoluted tubule
D. Collecting tubules
Animals that produce metabolic heat at low level and also absorb heat from the surroundings are called__________?
A. Ectotherms
B. Endotherms
C. Heterotherms
D. Homeotherms
Blubber a thick layer of fat is present in___________?
A. Terrestrial mammals
B. Fresh water mammals
C. Marine Mammals
D. Flying mammals
Production of pyrogens is a __________ phenomenon?
A. Protective
B. Constructive
C. Destructive
D. Aggressive
Thermostat of human body is present in__________?
A. Hind Brain
B. Fore brain
C. Thalamus
D. Hypothalamus
Which of the following structure in plant’s body is called excretophores?
A. Flowers
B. Leaves
C. Stem
D. Roots
The characteristic which enable animals to tolerate dehydration is called__________?
A. Osmoregulaton
B. Osmoconformation
C. Anhydrobiosis
D. Anhydrosis
Which of the following fishes excrete large volume of diluted urine?
A. Both depending upon the surrounding water
B. Fresh water fishes
C. Bony Marine fishes
D. None of these
Rose is an example of____________?
A. Xerophytes
B. Mesophytes
C. Hydrophytes
D. Halophytes
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. Feed back
B. Negative feed back
C. Positive feed back
D. Osmoregulation
Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment
B. Ammonia
C. Trimethyl alanine
D. Trimethylamine oxide
Terrestrial animals like kangaroo rat survive even without drinking water since__________?
A. They can retain excessive water in their body during raining season.
B. They don’t require water for their metabolic process
C. They feed on carbohydrate rich seeds which can provide them with metabolic water
D. They are anhydrobiotic organisms
Aquatic animals excrete nitrogenous waste commonly in the form of_____________?
A. Ammonia
B. Uric acid
C. Urea
D. Trimethylamine oxide
Protonephridia are present in____________?
A. Tape worms
B. Flateworm
C. Round worms
D. Segmented worms
Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules?
A. Amino acids
B. Glucose
C. Nitrogenous waste
D. All of these
Which of the following mechanism explains development of anemia in Renal failure?
A. Chronicity of the disease is respobsible for anemia
B. Destruction of RBC results from accumulated urea in the blood.
C. Failure of bone marrow is accompanied with renal failure.
D. Failure of proper RBC synthesis, due to lack of chemical stimulation.
Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?
A. Development of heat shock proteins.
B. Change in the solute composition of the cell membrane which prevents crystallization.
C. Increase in proportion of unsaturated fatty acids.
D. Change in membrane protein composition.
Which of the following statement about Homeostasis is incorrect?
A. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment
B. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
C. There is a definite control system that regulates the homeostatic activities
D. All are correct
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. Fresh water fishes
B. Hagfish
C. Bony fishes
D. None of these
Normal body temperature in mamals like human beings is____________?
A. 46 – 48°C
B. 36 – 38°C
C. 26 – 28°C
D. 56 – 58°C
In osmosis water molecules move from area of _____________ through semipermeable memberane?
A. Lower solvent concentration to higher solvent concentration
B. Lower solute concentration to higher solute concentration
C. Higher solute concentration to lower solute concentration
D. All of these
Which of the following is most toxic?
A. Ammonia
B. Uric acid
C. Urea
D. Trimethylamine oxide
In Urea cycle __________ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea.
A. 3
B. 2
C. 1
D. 4
Which of the vascular channels are related to Juxtramedullary nephrous only?
A. Afferent and efferent arterioles
B. Vasa nervosa
C. Peritubualr capillaries
D. Vasa recta
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. Burring a hole and removing the stone manually (nephrolithotomy)
B. Kidney surgery
C. Extracorporeal Shock wave lithotripsy
D. None of these
Bats & humming birds belong to___________?
A. Ectotherms
B. Endotherms
C. Heterotherms
D. Homeotherms
Thick, waxy & leathery cuticle around leaves is present in___________?
A. Mesophytes
B. Hydrophytes
C. Xerophytes
D. Halophytes
Which of the following animal excrete nitrogenous waste mainly as uric acid?
A. Planaria.
B. Hydra
C. Humans
D. Birds.
Which of the following openings have cilia?
A. Nephridiopore
B. Nephrostome
C. Both of these
D. None of these
Malphighian tubules absorb waste materials and salts from__________?
A. Lymph
B. Blood
C. Gut
D. Hemolymph
Which of the following filtrate contains excessive amount of amino acids, glucose, and salts?
A. Glomerular filtrate
B. Filtrate passing through distal conveluted tubule
C. Filtrate passing through ascending limb
D. Filtrate passing through collecting tubules
Mammalian kidney, under restricted water supply can conserve water by over ________ % reabsorption of glomerular filtrate
A. 90.50%
B. 80.50%
C. 95.50%
D. 99.50%
The nephridia of earthworm open into the coelom by_________?
A. Nephrostome
B. Flame cell
C. Nephridiopore
D. Anus
Nephrostome in earthworm opens in____________?
A. In gut
B. Internal Body cavity
C. External space
D. In Bladder
Scolidon or dog fish belong to the group of fishes called__________?
A. Cartilaginous fishes
B. Running fishes
C. Bony fishes
D. Jawless fishes
They are considered to be the most primitive and are surely the first of the vertebrates?
A. Reptiles
B. Frogs
C. Amphibinas
D. Jawless fishes
Sub- phylum vertebrate is also known as__________?
A. Aves
B. Craniata
C. Pisces
D. Amphibia
The phylum chrordata comprise about how many species?
A. 100,000
B. 50,000
C. 25,000
D. 10,00,000
It is stiff rod of special cells surrounded by connecive tissue present in the mid -dorsal region and appears in the embryos of all chordates
A. Cranianta
B. Notochord
C. Placenta
D. Ligule
Snails belong to__________?
A. Bivalves
B. Gastropods
C. Cephalopodsxc
D. Athropods
In mouth cavity of many molluscs there is a rasping tongue like structure_________provided with many horny teeth.
A. Mantle
B. Radula
C. Ligule
D. Muscle
All insects have how many parts of legs?
A. 2
B. 4
C. 3
D. 6
In all arthropods,the body is covered with a chittinous cuticle which is secreted by the____________?
A. Mesophyll
B. Endodermis
C. Chitin
D. Epidermis
In many which phylum the body of an organisms is usually divided in there regions called head, thorax and abdomen?
A. Arthropods
B. Annelida
C. Chordata
D. Echinodermata
In man which organisms cause abscesses on the skin of arms or legs?
A. Bacteria
B. Ascaris
C. Ring worm
D. Suinea worm
Chitin in cockroach is absent in____________?
A. Epicuticle
B. Endocuticle
C. Exocuticle
D. All of these
Melanin pigment in cockroach is found in__________?
A. Endocuticle
B. Exocuticle
C. Epicuticle
D. All of these
The bristles on the body of the cockroach arise from__________?
A. Basement membrane
B. Trichogen cell
C. Epidermis
D. Malpighian cell
The wax present on the body of cockroach is secreted:
A. Leucocytes
B. Mucocytes
C. Oenocytes
D. Granulocytes
Which organisms are sometimes called the ” pastures of the sea”?
A. Diatoms
B. Dinoflagellates
C. Radiolarians
D. Foraminiferans
Diatoms belong to___________?
A. Bacillariophyceae
B. Chrysophyta
C. Xanthophyceae
D. Both A. and B.
Which one of the following is representing the group of diatoms?
A. Pinnularia, Navicula, Cymbella, Melosira
B. Nostoc, Anabaena, Aulosira, Cylindrospermum
C. Euglenamorpha, Hedneria , Heteronema, Colacium
D. Cochlodinium, Gymnodinium, Lenodinium, Peridinium