Previous Year Papers NEET Biology Class 11 – Plant Growth and Development

Plant Growth and Development is a crucial chapter of NEET Biology Class 11 that explains the mechanisms of growth, differentiation, and morphogenesis in plants. Understanding this chapter is essential for answering both theoretical and diagram-based NEET questions.

NEET previous year papers often include questions on plant hormones, growth regulators, photoperiodism, vernalization, and seed dormancy. Practicing PYQs helps students master concepts, hormonal effects, and environmental influences. Studentbro.in provides exam-focused material for efficient preparation.

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Plant Growth – NEET PYQ Focus

Plant growth is defined as an irreversible increase in size and volume of a plant. Growth occurs at meristematic regions and is influenced by genetic and environmental factors.

NEET questions frequently test types of growth (primary and secondary), measurement methods (e.g., auxanometer, growth rate), and growth curves (S-curve, sigmoid curve).

Plant Differentiation and Development

Differentiation is the process by which cells become specialized to perform specific functions. Development includes all changes from germination to maturity.

NEET previous year papers often ask about differentiation, dedifferentiation, and redifferentiation, as well as the role of meristems (apical, lateral, and intercalary).

Plant Hormones – Important NEET Concepts

Plant hormones regulate growth and development. Major hormones include:

• Auxins – Promote cell elongation, apical dominance, root initiation.

• Gibberellins – Stimulate stem elongation, seed germination, and flowering.

• Cytokinins – Promote cell division, delay senescence, and interact with auxins.

• Abscisic Acid (ABA) – Inhibits growth, induces dormancy, and closes stomata.

• Ethylene – Promotes fruit ripening and leaf abscission.

NEET questions often focus on hormone functions, experiments (e.g., phototropism and gibberellin application), and practical applications.

Photoperiodism and Vernalization – Frequently Asked Questions

Photoperiodism is the response of plants to the relative length of day and night, influencing flowering. Plants are classified as short-day, long-day, and day-neutral.

Vernalization is the induction of flowering by exposure to low temperatures. NEET PYQs often include differences, examples, and significance of these processes.

Seed Dormancy and Germination

Seed dormancy prevents germination under unfavorable conditions. Germination resumes when favorable conditions return. Types include exogenous and endogenous dormancy.

NEET questions frequently test conditions required for germination, role of enzymes, and hormonal regulation.

Tropisms and Nastic Movements

Tropisms are directional growth responses to external stimuli (e.g., phototropism, geotropism, hydrotropism). Nastic movements are non-directional responses like nyctinasty and thigmonasty.

Previous year papers often ask for differences between tropic and nastic movements and examples of each.

Importance of Previous Year Papers for NEET Biology

Practicing previous year papers helps students identify frequently asked topics, reinforce conceptual understanding, and improve speed. PYQs for Plant Growth and Development focus on hormones, tropisms, photoperiodism, and dormancy, which are commonly tested in NEET.

Conclusion

Previous Year Papers of NEET Biology Class 11 Plant Growth and Development are essential for mastering plant physiology and developmental biology. This chapter requires clear understanding of growth mechanisms, hormones, photoperiodism, and seed dormancy.

Regular practice of PYQs helps students enhance conceptual clarity, diagram interpretation, and confidence in NEET. Studentbro.in provides structured, reliable, and exam-focused content to help NEET aspirants succeed.