Q3 Describe Briefly

• (a) Arithmetic Growth 
• (b) Geometric Growth 
• (c) Sigmoid Growth Curve 
• (d) Absolute and Relative Growth Rates

Answer:

• (a) Arithmetic Growth: When one daughter cell continues to divide and the other differentiates into maturity i.e. arithmetic growth. Here, Growth occurs in arithmetic progression.
• (b) Geometric Growth: When the growth is slow during the initial stage (lag phase) and rapid growth during later stages (log or exponential phase) i.e. called geometric growth. Here number and size increase in a multiplicative manner.
• (c) Sigmoid Growth: During this growth, the S-shaped growth curve occurs when the graph is plotted between the growth of living organisms and time. This growth curve is divided into three phases; (a) lag phase, (b) log phase or exponential phase, and (c) stationary phase.
  • Exponential growth can be expressed as follows:
    W1 = W0 ert 
    W1 = final size (weight, height, number etc.) 
    W0 = initial size at the beginning of the period 
    r = growth rate 
    t = time of growth 
    e = base of natural logarithms
• (d) Absolute Growth Rate: It is the measurement and comparison of growth per unit time. Relative Growth Rate: It is expressed on a common basis, it is the growth of a system per unit time.

NCERT Solutions for class 11 Chapter-13 Plant Growth and Development: The chapter on Plant Growth and Development is important for students approaching the home exams. This article introduces NCERT solutions designed to help students explain the concepts of further learning and how to write to get good grades on exams. The solutions are presented in very simple language for ease of understanding.

Solutions of NCERT CBSE Class 11 Chapter 13 Plant Growth and Development explains the growth and development of plants, how the growth of plants occurs and how they are developed, and which factors are essential for the growth and development of the plants, including phytohormones or plant hormones. Revise the basic concepts of Plant Growth and Development for quick revision and class notes.