biology Mcqs
1051. Bean shaped cells in plants are_________?
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A. guard cells

B. phloem cells

C. mesophyll cells

D. xylem cells

1052. ___________ potential is the measure of the change in water potential of a system due to the presence of solute molecules?
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A. Osmotic

B. Pressure

C. Both of these

D. None of these

1053. Which of the following manufactures carbohydrates by the process of photosynthesis?
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A. All of these

B. chloroplast

C. leucoplast

D. chromoplast

1054. Microfossile often present in petroleum producing formationsare those of__________?
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A. Heliozoans

B. Foraminiferans

C. Diatioms

D. Radiolarians

1055. Trisomy 21 is most common in mothers of the ________ age group.
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A. 35to39

B. 40to45

C. 15to19

D. 20to34

1056. Nephrostome in earthworm opens in____________?
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A. In Bladder

B. In gut

C. Internal Body cavity

D. External space

1057. QRS complex represents____________?
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A. Atrial diastole

B. Atrial systole

C. Ventricular diastole

D. Ventricular systole
1058. It is very serious disease of brain which is caused by fungi________?
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A. meningitis

B. hepatitis

C. none of these

D. ring worm

1059. Oil body is found in the cells of___________?
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A. Slime moulds

B. Diatoms

C. None of the these

D. Chlorophycean forms

1060. The flow of lymph is maintained by__________?
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A. Movement of viscera

B. Valves

C. Breathing movements

D. All of these
1061. The characteristic which enable animals to tolerate dehydration is called__________?
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A. Anhydrobiosis

B. Osmoregulaton

C. Anhydrosis

D. Osmoconformation

1062. Sub- phylum vertebrate is also known as__________?
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A. Craniata

B. Amphibia

C. Aves

D. Pisces

1063. Cuticular transpiration is _________ of total transpiration?
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A. 4-6%

B. 7-9%

C. 5-7%

D. 6-8%

1064. Sporogony of malaria parasite occurs in _______ ?
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A. RBC of man

B. Liver of man

C. Salivary glands of mosquito

D. Stomach wall of mosquito
1065. A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?
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A. Root pressure

B. Osmotic pressure.

C. Transpiration pull

D. None of these

1066. Which is not a vertebrate ?
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A. Fish

B. None of these

C. Insect

D. Reptiles

1067. Vacuoles are fluid filled sacs surrounded by a membrane called__________?
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A. cell membrane

B. tonoplast

C. nuclear membrane

D. cell wall

1068. Unlike other algae, diatoms do not readily decay due to___________?
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A. Water proof cell

B. Mucilaginous wall

C. Nonliving cells

D. Siliceous wall
1069. The nephridia of earthworm open into the coelom by_________?
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A. Flame cell

B. Anus

C. Nephridiopore

D. Nephrostome
1070. In the root cells _______ pathway becomes discontinuous in the endodermis due to the presence of casparian strip.
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A. Symplast

B. Apoplast

C. Vacuolar.

D. Tonoplast

1071. In which phase of cell cycle cell organelles are formed?
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A. G1 Phase

B. G2 Phase

C. S Phase

D. G0 Phase

1072. Cytoplasmic strands that extend through pores in adjacent cell walls are known as___________?
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A. Pseudopods

B. Plasmodesmata

C. Symplasts

D. Pili

1073. Centric discoid form of diatoms is__________?
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A. Diplaneis

B. Stephanodis

C. Camphyloneiscus

D. Coscinodiscus
1074. 95% of the cytoplasm of red blood cells is the___________?
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A. Hemoglobin

B. Enzymes

C. Proteins

D. Antibodies

1075. Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
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A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment

B. Trimethyl alanine

C. Ammonia

D. Trimethylamine oxide
1076. Sweat glands occur in greatest number in the skin of the__________?
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A. Armpits

B. Back

C. Palm of hand

D. Forehead

1077. Cooleys anemia is another name used for___________?
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A. None of these

B. Sickle cell anemia

C. Leucemia

D. Thalassaemia
1078. In mouth cavity of many molluscs there is a rasping tongue like structure_________provided with many horny teeth.
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A. Radula

B. Muscle

C. Ligule

D. Mantle

1079. Malphighian tubules absorb waste materials and salts from__________?
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A. Hemolymph

B. Blood

C. Lymph

D. Gut

1080. Active transport is dependent on____________?
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A. None of these

B. Photophosporylation

C. Photosynthesis

D. Respiration
1081. In man which organisms cause abscesses on the skin of arms or legs?
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A. Ascaris

B. Bacteria

C. Suinea worm

D. Ring worm

1082. In Urea cycle __________ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea.
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A. 1

B. 4

C. 2

D. 3

1083. In animals excess of nitrogen is excreted primarily in form of___________?
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A. Pyrimidine

B. Ammonia

C. Trimethyamine oxide

D. Creatinine

1084. Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?
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A. Increase in proportion of unsaturated fatty acids.

B. Development of heat shock proteins.

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

D. Change in membrane protein composition.

1085. Accurate name given to blood is ___________ ?
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A. Hemoglobin

B. Fluid tissue

C. Red fluid

D. Plasma

1086. The foetus is protected from the mechanical damage by the__________?
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A. uterus

B. vagina

C. amniotic fluid

D. cervix

1087. Each human kidney receives _______% of total cardiac out put?
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A. 20%

B. 10%

C. 40%

D. 30%

1088. All of the follwing are blood clots except:___________?
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A. Atheroma

B. Hematoma

C. Thrombus

D. Embolus

1089. Blubber a thick layer of fat is present in___________?
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A. Flying mammals

B. Terrestrial mammals

C. Marine Mammals

D. Fresh water mammals

1090. In all coelentrates endoderm give rise to__________?
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A. digestive system

B. circulatory system

C. reproductive system

D. nervous system

1091. Corolla and calyx collectively termed as___________?
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A. Complete flower

B. Se*ual whorls

C. Hermaphrodite

D. Prienth

1092. Cell wall is the non living , outermost boundary of__________cell?
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A. plant

B. fungal

C. all the above

D. bacterial

1093. The plants which produce embryo but lack vascular tissues and seeds are placed in_________?
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A. pteridophytes

B. all of these

C. tracheophytes

D. bryophytes
1094. Commonly in other plants than tall ones the speed of upward movement of water is____________?
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A. 1 mh-1

B. 7 mh-1

C. 8mh-1

D. 4 mh-1

1095. Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis
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A. Active transport

B. Osmosis

C. Diffusion

D. All of these

1096. Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?
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A. Hydathods

B. None of these

C. Stomata

D. Lenticels
1097. Diatoms are found in__________?
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A. Phytoplanktonic population

B. All of the above

C. Marine environment

D. Freshwater lakes and ponds

1098. Mammalian kidney, under restricted water supply can conserve water by over ________ % reabsorption of glomerular filtrate
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A. 90.50%

B. 95.50%

C. 80.50%

D. 99.50%
1099. Disease which transferred from animal to Human is_________?
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A. radic

B. demic

C. emic

D. onosis
1100. The respiratory problem most common in smokers is_________?
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A. cancer

B. tuberculosis

C. emphysema

D. asthma