Class 11 Biology - MP
Plant Growth and Development
The chapter 'Plant Growth and Development' in Class 11 Biology explores the fascinating processes by which a single fertilized egg transforms into a complex plant body. Students will learn about the indeterminate growth of plants, the role of plant growth regulators (auxins, gibberellins, cytokinins, ethylene, and abscisic acid), photoperiodism, vernalization, and seed dormancy. For the Madhya Pradesh Board (MPBSE) examinations, this chapter holds significant weight as it frequently features conceptual questions on plant hormones, physiological processes, and diagram-based questions on growth curves, making it crucial for scoring high marks in biology.
Start Learning FreeKey Concepts
Plant Growth
An irreversible, permanent increase in size, volume, or weight of an organ or its parts, driven mainly by mitotic cell division and cell elongation.
Plant Growth Regulators (PGRs)
Small, simple molecules of diverse chemical composition (like auxins, gibberellins, cytokinins, ethylene, and ABA) that act as chemical messengers to control plant development.
Photoperiodism
The physiological response of plants to the relative lengths of light and dark periods (day length) expressed in terms of flowering.
Vernalization
The phenomenon where flowering is promoted or induced by a prior exposure to a prolonged period of low temperature.
Seed Dormancy
A condition in which seeds fail to germinate even under favorable environmental conditions due to internal inhibitors or hard seed coats.
Important Formulas
Board Exam Info
In the Madhya Pradesh Board (MPBSE) Class 11 Biology examination, this chapter typically carries around 4 to 6 marks. Questions usually include objective-type multiple-choice questions, short answer questions on the functions of specific plant hormones, and distinguishing between photoperiodism and vernalization.
Frequently Asked Questions
What is the difference between indeterminate and determinate growth?
Indeterminate growth means the plant retains the capacity to grow continuously throughout its life due to meristems, whereas determinate growth stops after reaching a certain size, like in leaves and flowers.
Which plant hormone is known as the 'stress hormone'?
Abscisic acid (ABA) is known as the stress hormone because it regulates responses to water stress and induces stomatal closure.
What is the primary physiological effect of Auxin?
Auxins promote apical dominance, cell elongation in stem and roots, and root initiation in cuttings.
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