biology MCQs – Page 53

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
1041. During the process of cell division which of the following divides first?
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A. cytodplasm

B. nucleus

C. vacuoles

D. mitochondria

1042. Which of the following is the less important organ in human body?
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A. Hip bone

B. Appendix

C. Navel

D. Hair

1043. Stomatal transpiration is __________ of total transpiration
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A. 93%

B. 91%

C. 95%

D. 90%
1044. Which of the following is most toxic?
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A. Ammonia

B. Trimethylamine oxide

C. Urea

D. Uric acid

1045. Outside the thallus of Marchantia there are special structures called__________?
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A. none of these

B. sporangium

C. rhizoids

D. stem tuber

1046. Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called__________?
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A. Root pressure

B. Ascent of sap.

C. All of these

D. Transpiration pull
1047. Panting is a representative of which mechanism?
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A. Pigmentation.

B. Respiration.

C. Evaporative cooling.

D. Excretion.

1048. Which of the following are connective tissues?
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A. all the above

B. bone

C. blood

D. cartilage

1049. The part of the brain that connects the two hemispheres of the brain is called____________?
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A. Corpus callosum

B. Medulla oblongata

C. Cerebellum

D. Cerebral cortex

1050. Insulin is a human__________?
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A. Gene

B. Diabetes

C. Glucose

D. Protein
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