biology MCQs – Page 58

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 Review each marked answer and report any item that may be outdated or unclear.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
1141. Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap
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A. Increases.

B. Doesnt effect.

C. Maintains.

D. Lowers.
1142. Which of the following marine fishes are considered direct descendents of fresh water ancestors?
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A. Bony fishes

B. Jelly Fish

C. Star Fish

D. Hagfish

1143. Golden brown colour of diatoms is due to presence of__________?
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A. Fucoxanthin, diatoxanthin, diadinoxanthin

B. Alpha and beta carotenes and myxoxanthin

C. None of the above

D. Mycoxanthin, mucoxanthin and myxoxanthophylls

1144. Humans can hear in the range of ______ to _______Hertz (Hz).?
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A. 10 Hz to 10,000 Hz.

B. 30 Hz to 30,000 Hz.

C. 40 Hz to 40,000 Hz.

D. 20 Hz to 20,000 Hz.
1145. Terrestrial animals like kangaroo rat survive even without drinking water since__________?
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A. They feed on carbohydrate rich seeds which can provide them with metabolic water

B. They are anhydrobiotic organisms

C. They dont require water for their metabolic process

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

1146. Artherosclerosis is a major condition leading to__________?
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A. stroke

B. heart attack

C. hypertension

D. tumor

1147. Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?
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A. Diffusion.

B. Passive transport.

C. Active transport.

D. Facilitated diffusion.
1148. Which of the following nephrons play important role in production of concentrated urine?
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A. None of these

B. Crotical

C. Medullary

D. Juxtramedullary
1149. In plants, which of the following is a waste product produced both during photosynthesis and respiration?
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A. CO2

B. H2O

C. O2

D. Both A and B

1150. Adult human brain is about_________% of the total body weight.
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A. 7%

B. 2%

C. 8%

D. 3%

1151. The diffusion of ions along with water also takes place by mass flow system along the ________ path?
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A. Tonoplast

B. Symplast

C. Apoplast

D. Vacuolar

1152. Tobacco mosaic virus was crystallized by__________?
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A. Stanely

B. Ivanowski

C. Pasteur

D. Chamberland

1153. In HomoSapiens (Human) the fertilization occurs in the___________?
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A. Ovaries

B. Cervix

C. Oviduct

D. Uterus

1154. Cell wall is richly impregnated with silica in__________?
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A. Baciliariophyta

B. Euglenophyta

C. Rhodophyta

D. Phaeophyta

1155. The site/s where most of the uptake of water and minerals take place is/are__________?
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A. Root cells

B. Root hairs

C. Underground stem

D. All of these

1156. _________ give rise to macrophages, which destroy larger particles by phagocytosis.
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A. Basophila

B. Monocyte

C. Lymphocyte

D. Nautrophils

1157. Which of the following is not nocturnal?
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A. Cockroach

B. Mosquito

C. Butterfly

D. Bedbug

1158. Simple tissues and complex tissues are two groups of_________tissues.
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A. Meristematic

B. Supporting

C. Permanent

D. Epidermal

1159. Flagella are composed of________?
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A. intermediate filaments

B. micro tubules

C. glycoproteins

D. micro filaments

1160. Which of the following statement about Homeostasis is incorrect?
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A. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment

B. All are correct

C. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment

D. There is a definite control system that regulates the homeostatic activities