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NEET - October 2020 Previous Year Questions



NEET Biology Previous Year Questions - October 2020

Which of the following is incorrect about Cynobacteria?

[class-xi ]

  • They are photoautotrophs
  • They lack heterocysts
  • They often form blooms in polluted water bodies
  • They have chlorophyll A similar to green plants
    • Correct Option: B  [ They lack heterocysts ]

    Remark:

The size of Pleuropneumonia - like Organism (PPLO) is:

[class-xi ]

  • 0.02 µm
  • 1-2 µm
  • 10-20 µm
  • 0.1 µm
    • Correct Option: D  [ 0.1 µm ]

    Remark:

Phycoerythrin is the major pigment in:

[class-xi ]

  • Red algae
  • Blue green algae
  • Green algae
  • Brown algae
    • Correct Option: A  [ Red algae ]

    Remark:

Which of the following statements is incorrect about gymnosperms?

[class-xi ]

  • They are heterosporous
  • Male and female gametophytes are free living
  • Most of them have narrow leaves with thick cuticle
  • Their seeds are not covered
    • Correct Option: B  [ Male and female gametophytes are free living ]

    Remark:

Male and female gametophytes do not have an independent free living existence in:

[class-xi ]

  • Pteridophytes
  • Algae
  • Angiosperms
  • Bryophytes
    • Correct Option: C  [ Angiosperms ]

    Remark:

Which of the following options does correctly represent the characteristic features of phylum Annelida?

[class-xi ]

  • Triploblastic, unsegmented body and bilaterally symmetrical.
  • Triploblastic, segmented body and bilaterally symmetrical.
  • Triploblastic, flattened body and acoelomate condition.
  • Diploblastic, mostly marine and radially symmetrical.
    • Correct Option: B  [ Triploblastic, segmented body and bilaterally symmetrical. ]

    Remark:

Match the following group of organisms with their respective distinctive characteristics and select the correct option :

Organisms Characteristics
(A)Platyhelminthes (I)Cylindrical body with no segmentation
(B)Echinoderms (II)Warm blooded animals with direct development
(C)Hemichordates (III)Bilateral symmetry with incomplete digestive system
(D)Aves (IV)Radial symmetry with indirect development
Choose the correct answer from the options given below:

[class-xi ]

  • (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  • (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
  • (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
  • (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
    • Correct Option: A  [ (A)-(III), (B)-(IV), (C)-(I), (D)-(II) ]

    Remark:

Match the following columns and select the correct option:

Column - I Column - II
(A)Aptenodytes (I)Flying fox
(B)Pteropus (II)Angel fish
(C)Pterophyllum (III)Lamprey
(D)Petromyzon (IV)Penguin

[class-xi ]

  • (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
  • (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  • (A)-(IV), (B)-(I), (C)-(II), (D)-(III)
  • (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
    • Correct Option: C  [ (A)-(IV), (B)-(I), (C)-(II), (D)-(III) ]

    Remark:

All vertebrates are chordates but all chordates are not vertebrates, why?

[class-xi ]

  • Notochord is replaced by vertebral column in adult of some chordates.
  • Ventral hollow nerve cord remains throughout life in some chordates.
  • All chordates possess vertebral column.
  • All chordates possess notochord throughout their life.
    • Correct Option: A  [ Notochord is replaced by vertebral column in adult of some chordates. ]

    Remark:

Large, empty colourless cells of the adaxial epidermis along the veins of grass leaves are:

[class-xi ]

  • Lenticels
  • Guard cells
  • Bundle sheath cells
  • Bulliform cells
    • Correct Option: D  [ Bulliform cells ]

    Remark:
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