MCQOPTIONS
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MCQOPTIONS
This section includes 1275 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Thick, waxy & leathery cuticle around leaves is present in___________? |
| A. | Hydrophytes |
| B. | Mesophytes |
| C. | Xerophytes |
| D. | Halophytes |
| Answer» D. Halophytes | |
| 452. |
Protonephridia are present in____________? |
| A. | Round worms |
| B. | Flateworm |
| C. | Tape worms |
| D. | Segmented worms |
| Answer» C. Tape worms | |
| 453. |
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» D. All of these | |
| 454. |
Production of pyrogens is a __________ phenomenon? |
| A. | Protective |
| B. | Destructive |
| C. | Constructive |
| D. | Aggressive |
| Answer» B. Destructive | |
| 455. |
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» E. | |
| 456. |
In Urea cycle __________ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 457. |
Which of the following statement about Homeostasis is incorrect? |
| A. | There is a definite control system that regulates the homeostatic activities |
| B. | Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment |
| C. | Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment |
| D. | All are correct |
| Answer» C. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment | |
| 458. |
Which organisms are sometimes called the ” pastures of the sea”? |
| A. | Diatoms |
| B. | Radiolarians |
| C. | Dinoflagellates |
| D. | Foraminiferans |
| Answer» B. Radiolarians | |
| 459. |
Thermostat of human body is present in__________? |
| A. | Fore brain |
| B. | Hind Brain |
| C. | Thalamus |
| D. | Hypothalamus |
| Answer» E. | |
| 460. |
The distal blind end of the malpighian tubules bathes freely in____________? |
| A. | Digestive tract |
| B. | Intestines |
| C. | Haemocoel |
| D. | Coelom |
| Answer» D. Coelom | |
| 461. |
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» C. O2 | |
| 462. |
Which of the following is a sentimentally arranged excretory system? |
| A. | Protonephridium |
| B. | Metanephridium |
| C. | Malpighian tubules |
| D. | Nephrons |
| Answer» C. Malpighian tubules | |
| 463. |
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» D. It has pseudocoelom | |
| 464. |
Which excretory product in produced in plants during autotrophic mode of life? |
| A. | CO2 |
| B. | H2O |
| C. | O2 |
| D. | Both A and B |
| Answer» D. Both A and B | |
| 465. |
Ferns are included in__________? |
| A. | Psilopsida |
| B. | Lycopsida |
| C. | Sphenopsida |
| D. | Pteropsida |
| Answer» E. | |
| 466. |
Each human kidney receives _______% of total cardiac out put? |
| A. | 10% |
| B. | 20% |
| C. | 30% |
| D. | 40% |
| Answer» C. 30% | |
| 467. |
Purine and pyrimidine metabolism results in production of____________? |
| A. | Creatinine |
| B. | Trimethyamine oxide |
| C. | Xanthine |
| D. | None of these |
| Answer» D. None of these | |
| 468. |
95% of the cytoplasm of red blood cells is the___________? |
| A. | Antibodies |
| B. | Hemoglobin |
| C. | Enzymes |
| D. | Proteins |
| Answer» C. Enzymes | |
| 469. |
Which of the following statement about conifers is correct? |
| A. | Stored excretory products in vacuoles, at a concentration that leads to crystal formation |
| B. | Accumulate waste in leaves, which fall in autumn |
| C. | Production of black wood in the center |
| D. | Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants |
| Answer» E. | |
| 470. |
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» D. Controlling heat production | |
| 471. |
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» D. They pump blood from ventral to dorsal vessel | |
| 472. |
Panting is a representative of which mechanism? |
| A. | Pigmentation |
| B. | Respiration |
| C. | Evaporative cooling |
| D. | Excretion |
| Answer» D. Excretion | |
| 473. |
It has been estimated that in a normal person plasma constitutes about ________ by volume of blood. |
| A. | 35% |
| B. | 45% |
| C. | 55% |
| D. | 75% |
| Answer» D. 75% | |
| 474. |
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» C. Change the chemical nature of other proteins thus making them heat resistant | |
| 475. |
Open circulatory system can contain_________? |
| A. | Red Blood Cells |
| B. | White Blood Cells |
| C. | Haemoglobin |
| D. | All of these |
| Answer» C. Haemoglobin | |
| 476. |
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» B. Naturally induced active immunity | |
| 477. |
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» C. Passive transport | |
| 478. |
Lenticels look like__________? |
| A. | A big pore |
| B. | Stoma |
| C. | Sponge |
| D. | Cars or small protusions |
| Answer» E. | |
| 479. |
Which of the following are proteins in nature? |
| A. | Antibodies |
| B. | Interferons |
| C. | Antitoxins |
| D. | All of these |
| Answer» E. | |
| 480. |
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» C. Osmosis | |
| 481. |
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» D. None of these | |
| 482. |
Pressure flow theory was proposed by_________? |
| A. | H-Van Mohl |
| B. | Dixon |
| C. | Vander wall |
| D. | Earnst Munch |
| Answer» E. | |
| 483. |
It is the discharge of blood from blood vessels? |
| A. | Myocardial infarction |
| B. | Cerebral infarction |
| C. | Cerebral Hemorrhage |
| D. | Thromboembolism |
| Answer» D. Thromboembolism | |
| 484. |
Lenticular transpiration is ___________ of total transpiration? |
| A. | 2-3% |
| B. | 1-3% |
| C. | 1-4% |
| D. | 1-2% |
| Answer» E. | |
| 485. |
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» C. Symplast | |
| 486. |
The flow of lymph is maintained by__________? |
| A. | Movement of viscera |
| B. | Breathing movements |
| C. | Valves |
| D. | All of these |
| Answer» E. | |
| 487. |
Megaphylls are characteristic for____________? |
| A. | Ferns |
| B. | Seed plants |
| C. | Both of these |
| D. | None of these |
| Answer» C. Both of these | |
| 488. |
In bryophytes fertilization takes place in___________? |
| A. | Antheridia |
| B. | Archegonia |
| C. | water |
| D. | Ovule |
| Answer» C. water | |
| 489. |
Horsetails are included in class of____________? |
| A. | Sphenopeida |
| B. | Lycopsida |
| C. | Psilopsida |
| D. | Pteropsida |
| Answer» B. Lycopsida | |
| 490. |
Cytoplasmic strands that extend through pores in adjacent cell walls are known as___________? |
| A. | Pseudopods |
| B. | Symplasts |
| C. | Plasmodesmata |
| D. | Pili |
| Answer» D. Pili | |
| 491. |
In plants, water potential is determined by major factors? |
| A. | Three |
| B. | Four |
| C. | Two |
| D. | Five |
| Answer» D. Five | |
| 492. |
Hornwarts are included in sub-class of __________? |
| A. | Anthoceropsida |
| B. | Bryopsida |
| C. | Hepaticopsida |
| D. | Psilopsida |
| Answer» B. Bryopsida | |
| 493. |
Of the following which one is not the characteristic of the plants included in psilopsida_____________? |
| A. | Gametophyte is colourless |
| B. | They have mycorrhizal association |
| C. | Rhizoids bear Rhizome |
| D. | Aerial branches have veinless outgrowths |
| Answer» D. Aerial branches have veinless outgrowths | |
| 494. |
The space between the overtopped dichotomous branches was occupies by a sheet of _________ cells during evolution of megaphyllas? |
| A. | Sclerenchyma |
| B. | Chlorenchyma |
| C. | Parenchyma |
| D. | Collenchyma |
| Answer» C. Parenchyma | |
| 495. |
cells are of__________types? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» D. 1 | |
| 496. |
prokaryotic and eukaryotic are two types of___________? |
| A. | cells |
| B. | tissues |
| C. | organs |
| D. | organisms |
| Answer» B. tissues | |
| 497. |
The dichotomously branching system has shape similar to________________? |
| A. | U |
| B. | R |
| C. | Y |
| D. | Fork |
| Answer» D. Fork | |
| 498. |
Which of the following statement about alternation of generation in bryophytes is incorrect? |
| A. | It involves alternation of morphologically different generations |
| B. | Their gametophyte is independent while sporophyte depends upon gametophyte for nutrition. |
| C. | Both the gametophyte and sporophytes are haploid generations thus can produce haploids gametes to continue the diploid number on fertilization |
| D. | Spore formation occurs through meiosis |
| Answer» D. Spore formation occurs through meiosis | |
| 499. |
in animals meiosis produces____________? |
| A. | spores |
| B. | gametes |
| C. | both a & b |
| D. | all the above |
| Answer» C. both a & b | |
| 500. |
Which of the following fishes contained lungs? |
| A. | Lamprey |
| B. | Perch |
| C. | Plaice |
| D. | Dipnoi |
| Answer» E. | |