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NEET - 2021 Previous Year Questions



NEET Biology Previous Year Questions - 2021

Which of the following algae produce Carrageen?

[class-xi ]

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

    Remark:

Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:

[class-xi ]

  • Homosorus
  • Heterosorus
  • Homosporous
  • Heterosporous
    • Correct Option: D  [ Heterosporous ]

    Remark:

Which of the following algae contains mannitol as reserve food material?

[class-xi ]

  • Ectocarpus
  • Gracilaria
  • Volvox
  • Ulothrix
    • Correct Option: A  [ Ectocarpus ]

    Remark:

Gemmae are present in:

[class-xi ]

  • Mosses
  • Pteridophytes
  • Some Gymnosperms
  • Some Liverworts
    • Correct Option: D  [ Some Liverworts ]

    Remark:

Diadelphous stamens are found in:

[class-xi ]

  • China rose
  • Citrus
  • Pea
  • China rose and citrus
    • Correct Option: C  [ Pea ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Lenticels (I)Phellogen
(B)Cork cambium (II)Suberin deposition
(C)Secondary cortex (III)Exchange of gases
(D)Cork (IV)Phelloderm
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

Match List-I with List-II.

List-I List-II
(A)Cells with active cell division capacity (I)Vascular tissues
(B)Tissue having all cells similar in structure and function (II)Meristematic tissue
(C)Tissue having different types of cells (III)Sclereids
(D)Dead cells with highly thickened walls and narrow lumen (IV)Simple Tissue
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

Which of the following is an incorrect statement?

[class-xi ]

  • Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles.
  • Microbodies are present both in plant and animal cells.
  • The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm.
  • Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm.
    • Correct Option: A  [ Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Cristae (I)Primary constriction in chromosome
(B)Thylakoids (II)Disc-shaped sacs in Golgi apparatus
(C)Centromere (III)Infoldings in mitochondria
(D)Cisternae (IV)Flattened membranous sacs in stroma of plastids
Choose the correct answer from the options given below:

[class-xi ]

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

    Remark:

When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as:

[class-xi ]

  • Metacentric
  • Telocentric
  • Sub-metacentric
  • Acrocentric
    • Correct Option: A  [ Metacentric ]

    Remark:
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