Diversity of Living Organisms Class 9 MCQ Science

Diversity of Living Organisms Class 9 MCQ with Solutions

1. Species are considered as :

(A) Real units of classification devised by taxonomists

(B) Real basic units of classification

(D) Artificial concept of human mind which cannot be defined in absolute terms

Ans. (C)

Sol. The lowest basis of classification is Species.

2. The distinction of living organisms into Prokaryota and Eukaryota is mainly based on the characters of :

(A) Nucleus only

(B) Chromosomes only

(D) All of the above

Ans. (A)

Sol. Prokaryote : Primitive nucleus Nucleus lacks nuclear membrane, nucleolus and Histone protein while Eukaryotic cell has well defined true nucleus.

3. The phenomenon in which the haploid and diploid phases of a life cycle are multicellular is called :

(A) Double diploid

(B) Alternation of generations

(D) Multigenerational

Ans. (B)

Sol. Bryophytes and Pteridophytes exhibit alternation of generation-the haploid gametophyte (producing gametes for sexual reproduction) alternate with diploid sporophyte (Producing spores for asexual reproduction)

4. ……. is the basic unit of taxonomy :

(A) Genus

(B) Species

(D) Subspecies

Ans. (B)

Sol. Species is the fundamental unit of classification.

5. Plastids are absent in :

(A) Fungi

(B) Animal cell

(D) All of these

Ans. (D)

Sol. Plastids are present only in green Eukaryotic cells.

6. Systematic arrangement of organisms on the basis of their relatedness is called :

(A) Biodiversity

(B) Biogeography

(D) None of these

Ans. (C)

Sol. Taxonomy is associated with Identification, Classification & Nomenclature.

7. Each unit of classification is called :

(A) Order

(B) Cohort

(D) Trophic level

Ans. (C)

Sol. The unit of classification is Taxon (Eg. Species, Genus).

8. Binomial nomenclature is :

(A) Two words in name of a species

(B) Two names local and specific

(D) None of these

Ans. (D)

Sol. In binomial nomenclature given by Carolus Linnaeus, Fist name is Generic name and second name is species name.

9. Natural system of classification was given by:

(A) Aristotle

(B) Engler

(D) None of the above

Ans. (C)

Sol. Natural system is based on the relatedness of a species to other groups of organisms. Such system takes into account many comparable characters at a time.

10. Drawback in two kingdom classification is :

(A) Euglena

(B) Viruses

(D) None of these

Ans. (C)

Sol. Euglena is connecting link between plants and animals while virus is connecting link between living and non-living organsims. Viruses are not included in any kingdom.

11. Which of the following are included in kingdom monera :

(A) Bacteria

(B) Archaebacteria

(D) Both (A) & (B)

Ans. (D)

Sol. Monera kingdom has prokaryotic organsims, Bacteria and Archaebacteria both are prokaryotes.

12. Slime moulds are classified in kingdom :

(A) Monera

(B) Protista

(D) Plantae

Ans. (B)

Sol. Slime moulds are eukaryotic single celled organisms so these are included in protista.

13. Nitrogen fixation is the characteristic feature of :

(A) Protistans

(B) Plantae

(D) Monerans

Ans. (D)

Sol. Only two living organsims bacteria and blue green algae are present on earth which fix atmospheric nitrogen into nitrate (easily available form of N2). Both are Monerans.

14. Taxonomy comprises:

(A) Classification

(B) Nomenclature

(D) All of the above

Ans. (D)

Sol. Taxonomy is branch of biology which deals with identification, nomenclature and classification of living organisms.

15. Father of Taxonomy is:

(A) Aristotle

(B) Linnaeus

(D) Haeckel

Ans. (B)

Sol. Carolus Linnaeus is father of taxonomy. He developed Binomial Nomenclature.

16. The third kingdom added in Haeckel’s system of classification was:

(A) Protista

(B) Monera

(D) Archae

Ans. (A)

Sol. Haeckel added third Kingdom Protista. Three kingdom system includes plantae, animalia and protists.

17. One of the following has correct descending sequence hierarchy :

(A) Class, division, order, family

(B) Division, class, order, family

(D) Phylum, class, family, order

Ans. (B)

Sol. The correct order is division, class, order, family. Highest taxon is kingdom.

18. The kingdom added in Copeland’s system of classification was :

(A) Kingdom Fungi

(B) Kingdom Protista

(D) Kingdom Plantae

Ans. (C)

Sol. Four Kingdom system given by Copeland has Kingdom Monera. Four kingdom system includes plantae, animalia, Monera and protista.

19. Which of these is the first step of taxonomy:

(A) Naming

(B) Identification

(D) Hierarchial arrangement

Ans. (B)

Sol. First of all we have to identify the organism either it is plant/animal, prokaryotic/Eukaryotic, unicellular or multicellular.

20. Five kingdom classification is based on

(A) Mode of nutrition

(B) Complexity of body structure

(D) All of the above

Ans. (D)

Sol. Five Kingdom concept was proposed by Whittaker. The organisms are divided into five Kingdoms-Monera, Protista, Plantae, Fungi and animalia. On the basis of following criteria.

(1) Complexity of cell structure

(2) Source of Nutrition

(3) Mode of Nutrition

(4) Ecological status

(5) Complexity of body organization.

21. Gymnosperms differ from pteridophytes (gymnosperms are characterised by) :

(A) Naked ovule

(B) Circinate ptyxis

(D) Gametophyte

Ans. (A)

Sol. Gymnosperms do not have ovary so there is no fruit formation and seeds/ovules are naked. Pteridophytes do not have seeds.

22. Amphibians of plant kingdom are :

(A) Algae

(B) Bryophytes

(D) Floating plants

Ans. (B)

Sol. Bryophytes are known as amphibians of plant kingdom because they require water for fertilization.

23. Plants reproducing by spores such as mosses and ferns are grouped under the general term :

(A) Thallophytes

(B) Cryptogams

(D) Sporophytes

Ans. (D)

Sol. Spore producing plants are known as sporophytes.

24. What is true for Pteridophytes :

(A) Seeded vascular plants

(B) Seedless nonvascular plants

(D) Seedless vascular plants

Ans. (D)

Sol. Pteridophytes are first vascular plants but do not produce seeds.

25. Gymnosperms generally lack :

(A) Xylem tracheids and sieve tubes in the phloem

(B) Xylem vessels and sieve tubes in the phloem

(D) Xylem tracheids and companion cells in phloem

Ans. (C)

Sol. Xylem vessels and companion cells first appeared in Angiosperms.

26. Developed body than thallophytes , presence of rhizoids & multicellular sex organs is the characteristics of:

(A) Gymnosperms

(B) Angiosperms

(D) Pteridophytes

Ans. (C)

Sol. Mosses which are bryophytes have leafy structure with rhizoids and antheridia and archegonia as sex organs.

27. A plant body which is not differentiated into stem, roots, etc. is called :

(A) Thallus

(B) Mycelium

(D) Substratum

Ans. (A)

Sol. Plant body which is not differentiated into stem, roots etc. is called as thallus.

28. Presence of vessels is unique character of :

(A) Gymnosperms

(B) Angiosperms

(D) Bryophytes

Ans. (B)

Sol. Vessels are present only in angiosperms.

29. Appearance of sulphur showers for wind pollination is characteristic of :

(A) Gymnosperms

(B) Angiosperms

(D) Pteridophytes

Ans. (A)

Sol. In Pinus pollen grain has two large air sacs to facilitate dispersal by wind. Enormous quantities of pollen grains are produced so that cones become yellow and clouds of pollen grains are released.

30. Scattered vascular bundles are characteristic of :

(A) Monocots

(B) Dicots

(D) None of these

Ans. (A)

Sol. Vascular bundles in monocot stem are scattered while in Dicot stem these are arranged in a ring.

31. Which of the following is a monocot :

(A) Carrot

(B) Wheat

(D) Mustard

Ans. (B)

Sol. Wheat has only one cotyledon and has parallel venation in leaves.

32. The plant body has chitinous cell wall and is made up of hyphae and mycelium :

(A) Spirogyra

(B) Rhizopus

(D) Riccia

Ans. (B)

Sol. In fungi interwoven mass of thread like structure is known as hyphae and network of hyphae termed as mycelium.

33. Fungi differ from algae in having :

(A) Mainly cellulosic cell wall

(B) Mainly cell wall of chitin

(D) Starch as reserved food

Ans. (B)

Sol. Cell wall of algae is made up of cellulose while cell wall of fungi is made up of chitin. Reserve food of algae is starch while reserve food of fungi is glycogen and oil.

34. Riccia is :

(A) Algae

(B) Bryophyte

(D) Gymnosperm

Ans. (B)

Sol. Riccia is thallus like plant grouped in Bryophyta.

35. Which of the following is pteridophyte :

(A) Moss

(B) Cycas

(D) Pteridium

Ans. (D)

Sol. Moss is Bryophyte, Cycas is Gymnosperm, Mango is Angiosperm and Pteridium is Pteridophyte.

36. Green algae are ancestor of angiosperm land plants because :

(A) Both have cellulose in cell wall

(B) Both have starch as reserve food

(D) All of the above

Ans. (D)

Sol. Cell wall of plants and algae is made up of cellulose. Both of them synthesize their food with the help of chlorophyll and sunlight. Their reserve food is starch.

37. The algae which is called gulf weed is :

(A) Chlamydomonas

(B) Ulothrix

(D) Sargassum

Ans. (D)

Sol. Saragassum is brown algae present in sea.

38. The multicellular photosynthetic producers of the biosphere belong to :

(A) Kindom fungi

(B) Kingdom Protista

(D) Kingdom Plantae

Ans. (D)

Sol. Plantae has all multicellular photosynthetic producers.

39. Sea lettuce is :

(A) Ulva

(B) Laminaria

(D) Dictyota

Ans. (A)

Sol. Ulva is green algae which is used as salad.

40. The plants which produce neither flowers nor seeds but only spores in sporangia on their leaves are :

(A) Liverworts

(B) Mosses

(D) Cycads

Ans. (C)

Sol. Pteridophyta has sporophylls (Sporangia bearing leaf)

41. The dominating pigments of red algae are :

(A) Special carotenoids

(B) Fucoxanthin

(D) Haem

Ans. (C)

Sol. Red algae is red due to phycoerythrin. It is red coloured pigments.

42. The largest alga is :

(A) Ulva

(B) Chlaymydomonas

(D) Macrocystis

Ans. (D)

Sol. Macrocystis is largest alga. It’s length is upto 60 m. long.

43. Most of lichens are formed by

(A) Blue green algae and phycomycetes

(B) Blue green algae and ascomycetes

(D) Brown algae and phycomecetes

Ans. (B)

Sol. Lichen is symbiosis of algae (Green or blue green algae) and fungi (ascomycetes).

44. Algae are characterized by:

(A) Pyrenoids

(B) Aquatic habitat

(D) All of these

Ans. (D)

Sol. Pyrenoids are only present in algae and Algae is present in aquatic habitat. The sex organs are single celled called gametangia.

45. Rhizopus is commonly known as :

(A) Club fungi

(B) Bread mould

(D) None of these

Ans. (B)

Sol. Rhizopus is saprophytic and grow on bread.

46. Female sex organs in bryophytes are known as:

(A) Carpels

(B) Archegonia

(D) Antheridia

Ans. (B)

Sol. Flask shaped archegonia is female reproductive organ in both bryophytes and pteridophytes.

47. Sea weeds are source of :

(A) Chlorine

(B) Fluorine

(D) Iodine

Ans. (D)

Sol. Sea weeds like brown algae are rich source of iodine.

48. Which is not true of monocots :

(A) Parallel venation

(B) Single leaf

(D) Adventitious roots

Ans. (C)

Sol. Monocot flowers have floral parts in multiples of 3.

49. What is exclusive for angiosperms :

(A) Vessels

(B) Secondary growth

(D) Autotrophic nature

Ans. (C)

Sol. Double fertilization is characteristic feature of Angiosperm. By this fertilization, zygote and endosperm are produced.

50. Ferns are grown in gardens for their good looking :

(A) Leaves

(B) Sporangia

(D) Branches

Ans. (A)

Sol. Leaves of ferns are feather like which give it a beautiful appearance.

51. Animals like paramecium and Amoeba are placed in which phylum ?

(A) Porifera

(B) Coelenterata

(D) Arthropoda

Ans. (C)

Sol. Unicellular, eukaryotic organism are placed in kingdom protista. Protozoans are included in protista.

52. Which is the example of mixotrophic nutrition ?

(A) Paramecium

(B) Euglena

(D) Amoeba

Ans. (B)

Sol. Euglena has both autotrophic & Holozoic mode of nutrition.

53. __________ is considered a link between plants and animals :

(A) Paramecium

(B) Euglena

(D) Fungi

Ans. (B)

Sol. Euglena has characteristics of both plants and animals. It has chloroplast which is a characteristic feature of plant cell and presence of pellicle is animal character.

54. What is common about Trypanosoma, Noctiluca, Monocystis, Giardia and Amoeba :

(A) They produce spores

(B) They are parasites

(D) They have flagella

Ans. (C)

Sol. All of them belong to kingdom Protista as they are unicellular eukaryote.

55. Level of organisation in Sponges is

(A) Cellular level

(B) Acellular level

(D) Organ-system level

Ans. (A)

Sol. Sponges have cellular level of organisation. Cells do not form tissues.

56. A common chamber in sponges is

(A) Incurrent canal

(B) Radial canal

(D) Spongocoel

Ans. (D)

Sol. The cavity (central chamber) in sponges is spongocoel.

57. Bath sponge is :

(A) Spongia

(B) Spongilla

(D) Grantia

Ans. (A)

Sol. Spongia is commonly called as bath sponge. Its skeleton is used for bathing.

58. Regeneration power can best be studied in

(A) Planaria/ Dugesia

(B) Amphioxus

(D) Sponge

Ans. (D)

Sol. Sponges have the highest power of regeneration.

59. What is the main basis of classification of protozoa:

(A) Size

(B) Locomotory Device

(D) Number of nuclei

Ans. (B)

Sol. Members of phylum protozoa are classified on basis of locomotory organs. They can cilia, flagella and pseudopodia as locomotory organ.

60. Members of porifera are :

(A) Sluggish animals

(B) Sedentary animals

(D) All of above

Ans. (B)

Sol. Poriferans are mainly sedentary (found fixed to substratum).

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