Plant Growth and Development Previous Year Questions — NEET Biology

3 past-year Plant Growth and Development questions from NEET (Biology).

Q103 (2024)

Which one of the following is not a characteristic of plant cells in the phase of elongation?
  1. Increased vacuolation
  2. Large conspicuous nuclei
  3. Cell enlargement
  4. New cell wall deposition
### Related Formula Phase of Elongation: Cell enlargement, Increased vacuolation, New cell wall deposition. Meristematic Phase: Dense cytoplasm, Large conspicuous nuclei. ### Core Logic Plant cells in the phase of elongation are characterized by cell enlargement, increased vacuolation, and new cell wall deposition. Having a large conspicuous nucleus with rich protoplasm is characteristic of the meristematic phase. ### Step 1: Selection Therefore, 'Large conspicuous nuclei' is NOT a feature of the elongation phase. Option (2) is correct. ### Pattern Recognition Conspicuous nuclei + dense cytoplasm = Meristematic phase, NOT elongation phase. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Plant Growth and Development

Q111 (2024)

Heterophyllous development in response to environment is an example of which of the following phenomena?
  1. Dedifferentiation
  2. Elasticity
  3. Redifferentiation
  4. Plasticity
### Related Formula Plasticity: Ability of plants to follow different pathways in response to environment or phase of life to form different structures. ### Core Logic Heterophylly (e.g., in buttercup due to environment, or cotton, coriander, larkspur due to growth phases) is a classic example of plant plasticity. ### Step 1: Selection The phenomenon is called Plasticity. Option (4) is correct. ### Pattern Recognition Heterophylly in cotton/coriander/buttercup = Plasticity. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Plant Growth and Development

Q126 (2024)

Match List-I with List-II <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;"></th><th style="border: 1px solid #888; padding: 8px;">List-I (Growth Regulator)</th><th style="border: 1px solid #888; padding: 8px;"></th><th style="border: 1px solid #888; padding: 8px;">List-II (Function/Effect)</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">A.</td><td style="border: 1px solid #888; padding: 8px;">2,4-D</td><td style="border: 1px solid #888; padding: 8px;">I.</td><td style="border: 1px solid #888; padding: 8px;">Brewing industry</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">B.</td><td style="border: 1px solid #888; padding: 8px;">$GA_3$</td><td style="border: 1px solid #888; padding: 8px;">II.</td><td style="border: 1px solid #888; padding: 8px;">Stimulation of stomatal closure</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">C.</td><td style="border: 1px solid #888; padding: 8px;">Kinetin</td><td style="border: 1px solid #888; padding: 8px;">III.</td><td style="border: 1px solid #888; padding: 8px;">Herbicide</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">D.</td><td style="border: 1px solid #888; padding: 8px;">ABA</td><td style="border: 1px solid #888; padding: 8px;">IV.</td><td style="border: 1px solid #888; padding: 8px;">Nutrient mobilisation</td></tr></tbody></table></div> Choose the correct answer from the options given below :
  1. A-IV, B-III, C-II, D-I
  2. A-I, B-II, C-IV, D-III
  3. A-III, B-I, C-IV, D-II
  4. A-I, B-IV, C-III, D-II
### Related Formula 2,4-D (Synthetic Auxin) = Herbicide $GA_3$ (Gibberellin) = Malting/Brewing Kinetin (Cytokinin) = Nutrient mobilization (delays senescence) ABA (Abscisic Acid) = Stress hormone (Stomatal closure) ### Core Logic - 2,4-D: Synthetic auxin used as a selective weedicide/herbicide $\rightarrow$ III - $GA_3$: Speeds up malting process in brewing industry $\rightarrow$ I - Kinetin: Promotes nutrient mobilization to delay senescence $\rightarrow$ IV - ABA: Stimulates stomatal closure under stress $\rightarrow$ II ### Step 1: Match Verification Match sequence: A-III, B-I, C-IV, D-II. Correct option is (3). ### Pattern Recognition 2,4-D = Herbicide (A-III). ABA = Stomatal closure (D-II). Matches option (3). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Biology: Plant Growth and Development
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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