NCERT Solutions for Class 11 Biology Chapter 15 - Plant Growth and Development

 

NCERT Solutions for Class 11 Biology Chapter 15 - Plant Growth and Development: Have you ever thought about where and how the structures like roots, stems, leaves, flowers, fruits, and seeds arise and that too in an orderly sequence? You are, by now, aware of the terms seed, seedling, plantlet, mature plant. You have also seen that trees continue to increase in height or girth over a period of time. However, the leaves, flowers, and fruits of the same tree not only have limited dimensions but also appear and fall periodically and some time repeatedly. Why does the vegetative phase precede flowering in a plant? All plant organs are made up of a variety of tissues; is there any relationship between the structure of a cell, a tissue, an organ and the function they perform? 

The question is, then, why and how do they have different structural and functional attributes? Development is the sum of two processes: growth and differentiation. To begin with, it is essential and sufficient to know that the development of a mature plant from a zygote (fertilized egg) follow a precise and highly ordered succession of events. During this process, a complex body organization is formed that produces roots, leaves, branches, flowers, fruits, and seeds, and eventually, they die.

Here are the important topics of NCERT Class 11 Biology Chapter 15 - Plant Growth and Development mentioned below:

15.1 Growth

15.1.1 Plant Growth Generally is Indeterminate

15.1.2 Growth is Measurable

15.1.3 Phases of Growth

15.1.4 Growth Rates

15.1.5 Conditions for Growth

15.2 Differentiation, Dedifferentiation and Redifferentiation

15.3 Development 

15.4 Plant Growth Regulators

15.4.1 Characteristics

15.4.2 The Discovery of Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.1 Auxins

15.4.3.2 Gibberellins

15.4.3.3 Cytokinins

15.4.3.4 Ethylene

15.4.3.5 Abscisic acid

15.5 Photoperiodism

15.6 Vernalisation

Growth is one of the most conspicuous events in any living organism. It is an irreversible increase expressed in parameters such as size, area, length, height, volume, cell number, etc. It conspicuously involves increased protoplasmic material. In plants, meristems are the sites of growth. Root and shoot apical meristems sometimes along with intercalary meristem, contribute to the elongation growth of plant axes. Growth is indeterminate in higher plants. Following cell division in root and shoot apical meristem cells, the growth could be arithmetic or geometrical. Growth may not be and generally is not sustained at a high rate throughout the life of cell/tissue/organ/organism.

After going through Chapter 15 - Plant Growth and Development, you must be able to answer the following questions:

Q. Why is not anyone parameter good enough to demonstrate growth throughout the life of a flowering plant?

Q. Describe briefly:

  • (a) Arithmetic growth
  • (b) Geometric growth
  • (c) Sigmoid growth curve
  • (d) Absolute and relative growth rates

Q. List five main groups of natural plant growth regulators. Write a note on the discovery, physiological functions and agricultural/horticultural applications of any one of them. 

If unable to answer them, then don't worry NCERT Solutions for Class 11 Biology Chapter 15 - Plant Growth and Development will help to answer them by understanding the concept behind it.

NCERT Solutions for Class 11 Biology Chapter 15 Plant Growth and Development- Solved Exercise Questions

Also, try to answer all the questions mentioned in the exercise of this chapter. If you face any problem in solving them, then Solutions for NCERT Class 11 Biology Chapter 15 - Plant Growth and Development will help you out.

NCERT Solutions for class 11 Biology

Chapter-1

The Living World

Chapter-2

Biological Classification

Chapter-3

Plant Kingdom

Chapter-4

Animal Kingdom

Chapter-5

Morphology of Flowering Plants

Chapter-6

Anatomy of Flowering Plants

Chapter-7

Structural Organisation in Animals

Chapter-8

Cell: The Unit of Life

Chapter-9

Biomolecules

Chapter-10

Cell Cycle and Cell Division

Chapter-11

Transport in Plants

Chapter-12

Mineral Nutrition

Chapter-13

Photosynthesis in Higher Plants

Chapter-14

Respiration in Plants

Chapter-16

Digestion and Absorption

Chapter-17

Breathing and Exchange of Gases

Chapter-18

Body Fluids and Circulation

Chapter-19

Excretory Products and their Elimination

Chapter-20

Locomotion and Movement

Chapter-21

Neural Control and Coordination

Chapter-22

Chemical Coordination and Integration

NCERT Solutions for Class 11- Subject wise

NCERT solutions for Class 11 Biology

NCERT solutions for Class 11 Maths

NCERT solutions for Class 11 Chemistry

NCERT solutions for Class 11 Physics

 

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