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NEET Biology — Practice Paper

NEET · Biology

Time: 25 minutesTotal marks: 92

General instructions: Attempt all questions. Marks for each question are shown in the right margin. Internal choice, where given, is indicated by “OR”.

Section A

  1. 1.

    Which of the following is NOT a characteristic feature of phylum Chordata?

    [4]
    1. (a)Presence of notochord
    2. (b)Dorsal hollow nerve cord
    3. (c)Presence of gills in all stages of life
    4. (d)Presence of pharyngeal slits
  2. 2.

    Kingdom Fungi differs from Kingdom Plantae primarily in:

    [4]
    1. (a)Presence of cell wall made of cellulose
    2. (b)Heterotrophic mode of nutrition
    3. (c)Storage of carbohydrates as starch
    4. (d)Presence of membrane-bound organelles
  3. 3.

    Which of the following taxonomic groups contains the maximum number of described species?

    [4]
    1. (a)Phylum Arthropoda
    2. (b)Phylum Chordata
    3. (c)Kingdom Plantae
    4. (d)Class Insecta
  4. 4.

    Cuboidal epithelium is best suited for:

    [4]
    1. (a)Absorption and secretion
    2. (b)Protection against mechanical injury
    3. (c)Gaseous exchange
    4. (d)Ultrafiltration of blood
  5. 5.

    Which plant tissue possesses the inherent capacity for continuous cell division and growth throughout the plant's life?

    [4]
    1. (a)Phloem tissue
    2. (b)Xylem tissue
    3. (c)Meristematic tissue
    4. (d)Epidermal tissue
  6. 6.

    Which of the following tissues primarily transports organic substances and amino acids from leaves to other parts of the plant?

    [4]
    1. (a)Xylem
    2. (b)Phloem
    3. (c)Cambium
    4. (d)Cork
  7. 7.

    The organelle directly responsible for the synthesis of proteins in a cell is:

    [4]
    1. (a)Ribosome
    2. (b)Golgi apparatus
    3. (c)Rough endoplasmic reticulum
    4. (d)Mitochondrion
  8. 8.

    Which of the following organelles possesses a double membrane structure?

    [4]
    1. (a)Ribosome
    2. (b)Centrosome
    3. (c)Golgi apparatus
    4. (d)Mitochondrion
  9. 9.

    During which phase of the cell cycle is the DNA content of the nucleus doubled?

    [4]
    1. (a)G1 phase
    2. (b)S phase
    3. (c)G2 phase
    4. (d)M phase
  10. 10.

    The light-independent reactions (Calvin cycle) of photosynthesis occur in which compartment of the chloroplast?

    [4]
    1. (a)Thylakoid membrane
    2. (b)Stroma
    3. (c)Grana
    4. (d)Intermembrane space
  11. 11.

    Which plant hormone inhibits seed germination, promotes stomatal closure, and helps plants cope with water stress?

    [4]
    1. (a)Gibberellin
    2. (b)Abscisic acid
    3. (c)Cytokinin
    4. (d)Ethylene
  12. 12.

    Which essential mineral element is crucial for the structural integrity of cell walls through pectin formation and also serves as a cofactor for enzyme activation in plants?

    [4]
    1. (a)Iron
    2. (b)Magnesium
    3. (c)Calcium
    4. (d)Phosphorus
  13. 13.

    In the human digestive system, which enzyme catalyzes the hydrolysis of lipids (fats) into fatty acids and glycerol?

    [4]
    1. (a)Protease
    2. (b)Amylase
    3. (c)Lipase
    4. (d)Nuclease
  14. 14.

    The primary physiological role of hemoglobin in red blood cells is:

    [4]
    1. (a)Providing structural rigidity to RBCs
    2. (b)Transport of oxygen from lungs to tissues
    3. (c)Initiating immune responses
    4. (d)Catalyzing metabolic reactions
  15. 15.

    In the double circulation system of humans, deoxygenated blood from body tissues returns to which chamber of the heart?

    [4]
    1. (a)Right atrium
    2. (b)Left atrium
    3. (c)Right ventricle
    4. (d)Left ventricle
  16. 16.

    Asexual reproduction is primarily characterized by:

    [4]
    1. (a)Production of genetically identical offspring
    2. (b)Participation of two parents
    3. (c)Formation and fusion of gametes
    4. (d)Involvement of meiosis
  17. 17.

    The primary spermatocyte, which undergoes the first meiotic division in male gametogenesis, is:

    [4]
    1. (a)Haploid (n)
    2. (b)Diploid (2n)
    3. (c)Polyploid
    4. (d)Aneuploid
  18. 18.

    A man with blood group AB (genotype I^A I^B) marries a woman with blood group O (genotype ii). What will be the possible blood groups of their children?

    [4]
    1. (a)A and B only
    2. (b)AB and O only
    3. (c)A, B, and AB
    4. (d)All groups (A, B, AB, and O)

Section B

  1. 19.

    According to the Hardy-Weinberg principle, allele frequencies in a population remain constant across generations when:

    [4]
    1. (a)Mutations occur at a high rate
    2. (b)There is no gene flow, random mating occurs, and no natural selection
    3. (c)The population size is small
    4. (d)Genetic drift is the primary evolutionary force
  2. 20.

    Natural selection, as proposed by Darwin, operates on the basis of:

    [4]
    1. (a)Inheritance of acquired characters
    2. (b)Heritable variation and differential reproductive success
    3. (c)Disuse and use of organs leading to evolutionary change
    4. (d)Random mutation alone
  3. 21.

    Which of the following structures are considered vestigial organs in humans, providing evidence for evolution?

    [4]
    1. (a)Wisdom teeth and coccyx only
    2. (b)Appendix and wisdom teeth only
    3. (c)Coccyx, wisdom teeth, and appendix
    4. (d)Only the coccyx
  4. 22.

    Vaccination works as a medical intervention by:

    [4]
    1. (a)Killing all pathogens in the body immediately
    2. (b)Stimulating the adaptive immune response to produce antibodies and memory cells
    3. (c)Replacing damaged or diseased cells
    4. (d)Providing instantaneous passive immunity without immune system activation
  5. 23.

    Which of the following diseases is caused by a viral pathogen?

    [4]
    1. (a)Typhoid fever
    2. (b)Tuberculosis
    3. (c)COVID-19
    4. (d)Malaria
— End of paper —

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