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NEET - 2024 Previous Year Questions



NEET Biology Previous Year Questions - 2024

Given below are two statements:

Statement I: Bt toxins are insect group specific and coded by a gene cry IAc.

Statement II: Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut.

In the light of the above statements, choose the correct answer from the options given below:

[class-xii ]

  • Both Statement I and Statement II are false
  • Both Statement I and Statement II are true
  • Statement I is false but Statement II is true
  • Statement I is true but Statement II is false
    • Correct Option: D  [ Statement I is true but Statement II is false ]

    Remark: Explanation: NCERT Page No.208,(Topic-12.1 BIOTECHNOLOGICAL APPLICATIONS IN AGRICULTURE)

Given below are two statements:

Statement I: Parenchyma is living but collenchyma is dead tissue.

Statement II: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.

In the light of the above statements, choose the correct answer from the options given below:

[class-xi ]

  • Both Statement I and Statement II are false
  • Both Statement I and Statement II are true
  • Statement I is false but Statement II is true
  • Statement I is true but Statement II is false
    • Correct Option: C  [ Statement I is false but Statement II is true ]

    Remark: Explanation: NCERT Page No.87,(Topic-6.1.2.2 Complex Tissues)

List of endangered species was released by:

[class-xii ]

  • WWF
  • GEAC
  • IUCN
  • FOAM
    • Correct Option: C  [ IUCN ]

    Remark: Explanation: NCERT Page No.263,(Topic-15.1.4 Loss of Biodiversity)

The DNA present in chloroplast is:

[class-xi ]

  • Circular, double stranded
  • Linear, double stranded
  • Circular, single stranded
  • Linear, single stranded
    • Correct Option: A  [ Circular, double stranded ]

    Remark: Explanation: NCERT Page No.136,(Topic-8.5.5 Plastids)

Which of the following are fused in somatic hybridization involving two varieties of plants?

[class-xii ]

  • Somatic embryos
  • Callus
  • Pollens
  • Protoplasts
    • Correct Option: D  [ Protoplasts ]

    Remark: Explanation: NCERT Page No.178,(Topic-10.1 BIOTECHNOLOGICAL APPLICATIONS IN AGRICULTURE)

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

[class-xi ]

  • Gibberellin
  • Auxin
  • Abscisic acid
  • Cytokinin
    • Correct Option: A  [ Gibberellin ]

    Remark: Explanation: NCERT Page No.176, (Topic-13.4.3.2 13.4.3.2 Gibberellins)

Match List I with List II:

List-I List-II
A. Frederick Griffith I. Genetic code
B. Francois Jacob & Jacque Monod II. Semi-conservative mode of DNA replication
C. Har Gobind Khorana III. Transformation
D. Meselson & Stahl IV. Lac operon
Choose the correct answer form the options given below:

[class-xii ]

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

    Remark: Explanation: NCERT Page No.84, (Topic-5.2 THE SEARCH FOR GENETIC MATERIAL)

Given below are two statements:

Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 fixation is decreased.

Statement II: In C4 plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.

In the light of the above statements, choose the correct answer from the options given below:

[class-xi ]

  • Both Statement I and Statement II are false
  • Both Statement I and Statement II are true
  • Statement I is false but Statement II is true
  • Statement I is true but Statement II is false
    • Correct Option: D  [ Statement I is true but Statement II is false ]

    Remark: Explanation: NCERT Page No.147, (Topic-11.9 PHOTORESPIRATION)

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate:

[class-xi ]

  • Succinic acid → Malic acid
  • Malic acid → Oxaloacetic acid
  • Isocitrate → α-ketoglutaric acid
  • Succinyl-CoA → Succinic acid
    • Correct Option: D  [ Succinyl-CoA → Succinic acid ]

    Remark: Explanation: NCERT Page No.158, (Topic-12.4.1 Tricarboxylic Acid Cycle)

Match List I with List II:

List-I List-II
A. Citric acid cycle I. Cytoplasm
B. Glycolysis II. Mitochondrial matrix
C. Electron transport system III. Intermembrane space of mitochondria
D. Proton gradient IV. Inner mitochondrial membrane
Choose the correct answer form the options given below:

[class-xi ]

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

    Remark: Citric acid cycle - Mitochondrial matrix (NCERT Page No. 159).

    Glycolysis - Cytoplasm (NCERT Page No. 155).

    Electron transport system - Inner mitochondrial membrane (NCERT Page No. 159).

    Proton gradient - Intermembrane space of mitochondria (NCERT Page No. 160).
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NEET Biology Previous Year Questions (PYQs)