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

Core Logic

The phase of elongation in plant growth is characterised by:

• Increased vacuolation
• Cell enlargement
• New cell wall deposition

The presence of "large conspicuous nuclei" is a feature of cells in the meristematic phase (where intense cell division requires massive nuclear activity and dense cytoplasm).

Step 1: Final Conclusion

Large conspicuous nuclei are not characteristic of the elongation phase.

Pattern Recognition

Meristematic cells = dense cytoplasm + large nuclei (for division). Elongation cells = central vacuole formation + cell wall expansion.

Chapter Mix

Class 11 Biology: Plant Growth and Development

Core Logic

• 2,4-D (an Auxin) is widely used as a weedicide/herbicide to kill dicotyledonous weeds. (A-III)
• GA₃$GA_{3}$ (Gibberellic Acid) is used to speed up the malting process in the brewing industry. (B-I)
• Kinetin (a Cytokinin) promotes nutrient mobilisation, which helps in the delay of leaf senescence. (C-IV)
• ABA (Abscisic Acid) acts as a stress hormone and stimulates the closure of stomata during water stress. (D-II)

Step 1: Final Conclusion

The correct matches are A-III, B-I, C-IV, D-II.

Pattern Recognition

ABA is synonymous with stress and stomatal closure (D-II). 2,4-D is the classic herbicide (A-III).

Chapter Mix

Class 11 Biology: Plant Growth and Development