8 public questions tagged with this topic.
Plasticity refers to the ability of plants to show different forms under different environmental or developmental conditions, such as heterophylly.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Heterophylly, the occurrence of different leaf forms in the same plant (e.g., coriander), is an example of plasticity.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Photoperiodism Vernalisation and Development
Heterophylly, the presence of different leaf types in the same plant (e.g., coriander), is an example of developmental plasticity.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Plant Growth Regulators - Cytokinins Ethylene and Abscisic Acid
Buttercup exhibits environmental heterophylly, where leaves have different forms when produced in air or water.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
C₄ plants use PEP carboxylase to initially fix CO₂, reducing photorespiration by maintaining high CO₂ concentration in bundle sheath cells.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants C4 Pathway - Hatch and Slack and Photorespiration
The C₄ pathway allows plants to fix CO₂ efficiently in dry conditions by reducing photorespiration.
Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Photosynthesis - Early Experiments and Pigments
“High stress, low disturbance habitats” for stress-tolerators are adapted to. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“High resource, low stress habitats”, “Constant waterlogged environments”, “Periodic fire and drought”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Selection favors the schedule that increases lifetime reproductive success under local mortality and resource conditions. Body size, development time, fecundity, parental investment, and generation length consequently tend to covary. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.
Ref: Plant Strategies and Vegetation Processes, Grime, 2nd Ed.
“Low stress, high disturbance” for ruderal species occur in environments with. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“High competition, high disturbance”, “Low disturbance, high stress”, “High competition, low disturbance”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Selection favors the schedule that increases lifetime reproductive success under local mortality and resource conditions. Body size, development time, fecundity, parental investment, and generation length consequently tend to covary. Field observations could test this account by measuring the proposed driver and the demographic or ecosystem response while controlling plausible confounding factors. This distinction matters because similar surface patterns can arise through different mechanisms, whereas ecological prediction depends on identifying the mechanism that actually changes rates.
Ref: Plant Strategies and Vegetation Processes, Grime, 2nd Ed.
