NEET Plant Growth and Development PYQ practice sheet

20 previous-year NEET Botany questions from Plant Growth and Development, newest papers first. Plant Growth and Development carries 24 of the Botany questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   Which of the following plant growth regulators is used as herbicide?

   • (A)
     Kinetin
   • (B)
     Abscisic acid
   • (C)
     Gibberellin
   • (D)
     2, 4-D
2. 2.

   RE-NEET 2026

   Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage?

   • (A)
     Gibberellin
   • (B)
     Ethephon
   • (C)
     Abscisic acid
   • (D)
     Indole butyric acid
3. 3.

   RE-NEET 2026

   Length of the stem at time 0 is 20 cm. The arithmetic growth rate is 30 cm per day. What is the length of the stem at the end of the 7$^{th}$ day?

   • (A)
     460 cm
   • (B)
     50 cm
   • (C)
     170 cm
   • (D)
     230 cm
4. 4.

   NEET 2026

   Which one of the following is not a characteristic of plant cells in the phase of elongation?

   • (A)
     Increased vacuolation
   • (B)
     Large conspicuous nuclei
   • (C)
     New cell wall deposition
   • (D)
     Cell enlargement
5. 5.

   NEET 2026

   Match List-I with List-II: List-I (Growth Regulator): A. 2,4-D, B. $\mathrm{GA_3}$, C. Kinetin, D. ABA List-II (Function/Effect): I. Brewing industry, II. Stimulation of stomatal closure, III. Herbicide, IV. Nutrient mobilisation Choose the correct answer from the options given below:

   • (A)
     A-I, B-IV, C-III, D-II
   • (B)
     A-IV, B-III, C-II, D-I
   • (C)
     A-III, B-I, C-IV, D-II
   • (D)
     A-I, B-II, C-IV, D-III
6. 6.

   NEET 2026

   Heterophyllous development in response to environment is an example of which of the following phenomena?

   • (A)
     Plasticity
   • (B)
     Elasticity
   • (C)
     Redifferentiation
   • (D)
     Dedifferentiation
7. 7.

   NEET 2024

   Formation of interfascicular cambium from fully developed parenchyma cells is an example for

   • (A)
     Dedifferentiation
   • (B)
     Redifferentiation
   • (C)
     Differentiation
   • (D)
     Maturation
8. 8.

   NEET 2024

   Auxin is used by gardeners to prepare weed free lawns. But no damage is caused to grass as auxin:

   • (A)
     promotes apical dominance.
   • (B)
     does not affect mature monocotyledonous plants.
   • (C)
     promotes abscission of mature leaves only.
   • (D)
     can help in cell division in grasses, to produce growth.
9. 9.

   NEET 2024

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

   • (A)
     Auxin
   • (B)
     Gibberellin
   • (C)
     Abscisic acid
   • (D)
     Cytokinin
10. 10.

    NEET 2023

    In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as -

    • (A)
      Senescence
    • (B)
      Differentiation
    • (C)
      Dedifferentiation
    • (D)
      Development
11. 11.

    NEET 2023

    Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

    • (A)
      Abscisic Acid
    • (B)
      Indole-3-butyric Acid
    • (C)
      Gibberellic Acid
    • (D)
      Zeatin
12. 12.

    NEET 2023

    Which hormone promotes internode/petiole elongation in deep water rice?

    • (A)
      2, 4-D
    • (B)
      $\mathrm{GA_3}$
    • (C)
      Kinetin
    • (D)
      Ethylene
13. 13.

    NEET 2022

    Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield, as the hormone is known to produce female flowers in the plants:

    • (A)
      Cytokinin
    • (B)
      ABA
    • (C)
      Gibberellin
    • (D)
      Ethylene
14. 14.

    NEET 2022

    Which one of the following plants does not show plasticity?

    • (A)
      Maize
    • (B)
      Cotton
    • (C)
      Coriander
    • (D)
      Buttercup
15. 15.

    NEET 2022

    The gaseous plant growth regulator is used in plants to:

    • (A)
      kill dicotyledonous weeds in the fields
    • (B)
      speed up the malting process
    • (C)
      promote root growth and root-hair formation to increase the absorption surface
    • (D)
      help overcome apical dominance
16. 16.

    NEET 2021

    The plant hormone used to destroy weeds in a field is :

    • (A)
      IAA
    • (B)
      IBA
    • (C)
      NAA
    • (D)
      2, 4-D
17. 17.

    NEET 2021

    Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called :

    • (A)
      Elasticity
    • (B)
      Flexibility
    • (C)
      Maturity
    • (D)
      Plasticity
18. 18.

    NEET 2021

    The site of perception of light in plants during photoperiodism is :

    • (A)
      Leaf
    • (B)
      Stem
    • (C)
      Axillary bud
    • (D)
      Shoot apex
19. 19.

    NEET 2020

    Which of the following is not an inhibitory substance governing seed dormancy?

    • (A)
      Gibberellic acid
    • (B)
      Abscisic acid
    • (C)
      Phenolic acid
    • (D)
      Para-ascorbic acid
20. 20.

    NEET 2020

    Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

    • (A)
      Cytokinin
    • (B)
      Gibberellin
    • (C)
      Ethylene
    • (D)
      Abscisic acid