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

Core Logic

Plants follow different pathways in response to their environment or during phases of life to form structurally different kinds of organs (e.g., leaves). This inherent ability to alter morphological traits is termed plasticity. An example of environmental plasticity is heterophylly in plants like buttercup (where submerged leaves are highly dissected and aerial leaves are broad).

Step 1: Final Conclusion

The phenomenon is Plasticity.

Pattern Recognition

Heterophylly (different leaf shapes) = Plasticity. It can be developmental (coriander, cotton) or environmental (buttercup).

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