MCQs of Biology for Medical Entrance Preparation (Part-1)

Here, we present some of the MCQs of biology for students of different medical fields. It may be helpful to those students  who are determined to achieve and fulfill their aim in future.

1. Which of the following statements regarding universal rules of nomenclature is wrong?

• The first word in biological name represents the genus.
• The first word denoting the genus starts with a capital letter.
•  Both the words in a biological name, when handwritten, are separately underlined.
• Biological names are generally in Greek and written in italics.
• The second component in a biological name denotes the specific epithet.

2. Which of the following series includes the orders ranales, parietals and malvales?

•  Bicarpellatae
•  Thalamiflorae
• Calyciflorea
• Disciflorea

3. The binomial of sunn hemp is

•  Crotolaria juncea
• Erythrina indica
• Glycine max
• Arachis hypogea

4. Systema Naturae was written by

• Linnaeus
• Aristotle
• Hippocrates
• Darwin

5. The first organisms to appear on earth were

• photo-autotrophs
• chemoautotrophs
• chemo-heterotrophs
• coacervates

6. A group of interconnected genera is called

• Family
• Order
• Phylum
• Class

7. Practical significant of taxonomy is

•  Classification
•  To understand diversity
•  To understand evolution
•  Identification of organisms

8. Which one of the following aspects is an exclusive characteristic of living things?

• Isolated metabolic reactions occur in vitro
• Increase in mass from inside only
• Perception of events happening in the environment and their memory
• Increase in mass by accumulation of material both on surface as well as internally.

9. Which one of the following is considered important in the development of seed habit?

• heterospory
• haplontic life cycle
• free living gametophyte
• dependent sporophyte

10. Plant nomenclature means

• to give names to plants without any rules
• nomenclature of plants under the international rules
• nomenclature of plants in local language
• nomenclature of plants in English language

11. Scientific name of mango plant is Mangifera indica (Linn) Santapau. In the above name Santapau refers to

• variety of mango
• a taxonomist who proposed the present nomenclature in honour of Linnaeus
• a scientist who for the first time described mango plant
• a scientist who changed the name proposed by Linnaeus and proposed present name

12. Basic unit or smallest taxon of taxonomy/classification is

• Species
• Kingdom
• Family
• Variety

13. Which of the following is a correct name?

• Solanum tuberosum
• Solanum Tuberosum
• Solanum tuberosum Linn.
• All the above

14. Which one of the following is not a correct statement?

• botanical gardens have collection of living plants for reference.
• a museum has collection of photographs of plants and animals.
• key is taxonomic aid for identification of specimens.
• herbarium houses dried, pressed and preserved plant specimens.

15. The term taxon refers to

• name of a species
• name of genus
• name of family
• a taxonomic group of any rank

16. Which of the following is a species?

• Tamarindus
• Indicus
• Indica
• Tamarindus indicus

17. Most of the Botanical names are drawn from the following language

• German
• Greek
• Latin
• Spanish

18. Which one of the following organisms is scientifically correctly named, correctly printed according to the International Rules of Nomenclature and correctly described?

• Musca domestica– The common house lizard, a reptile
• Plasmodium falciparum– A protozoan pathogen causing the most serious type of malaria
• Felis tigris– The Indian tiger, well protected in Gir forests
• E. coli– Full name Entamoeba coli, a commonly occurring bacterium in human intestine

19. Which one of the following is a taxonomical aid for identification of plants and animals based on similarities and dissimilarities?

• flora
• keys
• monographs
• catalogues

20. Select the incorrect statements

• lower the taxon, more are the characteristics that the members with in the taxon share.
• order is the assemblage of genera which exhibits a few similar charcaters.
• cat and dog are included in the same family Felidae.
• binomial nomenclature was introduced by Carolus Linnaeus.

21. Refer the botanical name of wheat “Triticum aestivum” and identify the statement which correctly describes it.

• the second world belongs to genus and starts with a small letter.
• both the words “Triticum aestivum” denote the specific epithet.
• the first word Triticum denotes the genus which starts with a capital letter.
• the first word Triticum denotes the specific epithet while the second word denotes the genus.

22. Which of the following shows the correct example of taxonomic category- Genus?

• Potato, tomato and brinjal belong to Solanum.
• Monkey, gorilla and gibbon placed in Mammalia.
• Solanum, Petunia and Datura placed in Solanacea.
• Mangifera indica, Solanum tuberosum, and Panthera leo.

23. ‘Taxa’ differs from ‘taxon’ due to being

• a higher taxonomic category than taxon.
• lower taxonomic category than taxon.
• the plural of taxon.
• the singular of taxon.

24. Two plants can be exclusively said to belong to the same species if they

• have same number of chromosomes.
• can reproduce freely with each other and form seeds.
• have more than 90% similar genes.
• look similar and possess identical secondary metabolites.

25. One of the most important functions of botanical gardens is that

• they provide a beautiful area for recreation.
• one can observe tropical plants here.
• they allow ex-situ conservation of germ plasm.
• they provide the natural habitat for the wildlife.

26. The most important of all living systems is to

• utilize oxygen to generate energy.
• replicate the genetic information.
• produce gametes.
• utilize solar energy for metabolic activities.

27. The disadvantage of using common names for species is that

• the names may change.
• one name does not apply universally.
• one species may have several common names and one common name may be applies to two species.
• all of the above.

28. Taxonomic hierarchy refers to

• step-wise arrangement of all categories for classification of plants and animals.
• a group of senior taxonomists who decide the nomenclature of plants and animals.
• a list of botanists or zoologists who have worked on taxonomy of a species or group.
• classification of a species based on fossil record.

29. Identify the correct sequence of taxonomic categories

• Speices → Genus → Order → Class → Family → Phylum/Division → Kingdom
• Species → Genus → Family → Class → Phylum/Division → Order → Kingdom
• Species → Family → Genus → Order → Class → Phylum/Division → Kingdom
• Species → Genus → Family → Order → Class → Phylum/Division → Kingdom

30. Protista includes

• heterotrophs
• chemoautotrophs
• chemo-heterotrophs
• all the above

31. Kingdom of unicellular eukaryotes

• fungi
• monera
• plantae
• protista

32. In Whittaker’s five kingdom system of classification, eukaryotes were assigned to-

• only three kingdom
• only one kingdom
• all the five kingdom
• only four of the five kingdoms

33. Which one belongs to monera?

• Amoeba     
• Escherichia
• Gelidium         
• Spirogyra

34. A true species consists of a population

• sharing the same niche
• interbreeding
• feeding over the same food
• reproductivity isolated

35. Which groups of plants have embryo but not vascular tissue?

• cyanophyta
• tracheophyta
• bryophyta
• chlorophyta

36. Whittaker is famous for

• two kingdom classification
• four kingdom classification
• five kingdom classification
• distinguishing in bacteria and blue green algae

37. Kingdom monera comprises the following

• plants of economic importance
• prokaryotic organisms
• plants of thallophyta group
• all the plants studied in biology

38. Mannitol is the stored food in

• Porphyra           
• Fucus       
• Gracillaria        
• Chara

39. Mycorrhiza is

• a symbiotic association of plant roots and certain fungi
• an association of algae with fungi
• an association of Rhizobium with the roots of leguminous plants
• a fungus parasitizing root system of higher plants

40. Organisms which are indicator of SO₂ pollution

• Mosses
• Lichens
• Mushrooms
• Puffballs

41. Protistan genome has

• membrane-bound nucleoproteins embedded in cytoplasm
• nucleoprotein in direct contact with cell substance
• free nucleic acid aggregates
• gene containing nucleoproteins condensed together in loose mass

42. The main difference in gram positive and gram negative bacteria resides in their

• cytoplasm
• flagella
• cell wall
• cell membrane

43. The chemical compounds produced by the host plants to protect themselves against fungal infection is

• phytotoxin
• pathogen
• phytoalexins
• hormone

44. Phylogenetic system of classification is based on

• chemical constituents
• floral characters
• morphological characters
• evolutionary relationship

45. Decomposers are organisms that

• illaborate chemical substances, causing death of tissues
• operate in living body and simplifying organic substances of cells step by step
• operate in relay terms, simplifying step by step the organic constituents of dead body
• attack and kill plants as well as animals

46. Compared with the gametophytes of the bryophytes the gametophytes of vascular plant are

• larger but have smaller sex organs
• smaller but have larger sex organs
• smaller and have smaller sex organs
• larger and have larger sex organs

47. Movements by pseudopodia of Amoeba are due to change in

• atmosphere
• temperature
• viscosity
• pressure

48. Powdery mildew of wheat is caused by species

• Ustilago
• Albugo
• Puccinia             
• Erysiphe

49. Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because

• embryo develops in female gametophyte which is retained on parent sporophyte
• female gametophyte is free and gets dispersed like seeds
• female gametophyte lacks archaegonia
• megaspores possess endosperm and embryo surrounded by seed coat

50. Bacteria lack alternation of generation because there is

• no distinct chromosomes
• no exchange of genetic material
• neither syngamy nor reduction division
• no conjugation

51. Which one single organism or the pair of organisms is correctly assigned to its taxonomic group?

• Paramecium and Plasmodium belong to the same kingdom as that of Penicilium.
• Yeast used in baking bread and beer is a fungus.
• Nostoc and Anabaena are examples of Protista.
• Lichen is a composite organism formed from the symbiotic association of an alga and a protozoan.

52. In some viruses, RNA is present instead of DNA indicating that

• they cannot replicate.
• there is no hereditary information.
• RNA can transfer heredity material.
• their nucleic acid must combine with host DNA before replication.

53. Bacteria were regarded to be plants because

• some of them cannot move.
• some of them are green in colour.
• they have  a rigid cell wall.
• they are present everywhere.

54. A virus can be considered a living organism because it

• respires
• responds to touch stimuli.
• can cause disease.
• reproduces (inside the host).

55. Yeast is not included in protozoans but in fungi because

• some fungal hyphae grow in such a way that they give the appearance of pseudo-mycelium.
• it has no chlorophyll.
• cell wall is made up of cellulose and reserve food material is starch.
• it has eukaryotic organization.

56. When a moist bread is kept exposed in air, it becomes mouldy and black because

• spores are present in the bread.
• spores are present in the water.
• the bread decomposes.
• spores are present in air.

57. Lichens indicate SO₂ pollution because they

• grow faster than others.
• show association between algae and fungi.
• flourish in SO₂ rich environment.
• are sensitive to SO₂.

58. Ustilago causes plant diseases (called smuts) because

• they lack mycelium.
• they parasitize on cereals.
• their affected parts becomes completely black.
• they develop sooty masses of spores.

59. A fungus contains cells with two nuclei from different genomes. The nuclei do not fuse but divide independently and simultaneously as new cells are formed. This fungus belongs to

• zygomycetes
• phycomycetes
• deuteromycetes
• basidiomycetes

MCQs of Biology for medical entrance preparation (part-1)