Types of Growth Curves — NEET Biology
📚 Practice ConceptDescribe briefly: (a) Arithmetic growth (b) Geometric growth (c) Sigmoid growth curve (d) Absolute and relative growth rates
Which of the following statements concerning growth rates and patterns in plants are NOT correct? S1: In arithmetic growth, both daughter cells formed after a mitotic cell division retain the ability to divide. S2: Geometric growth is characterized by an initial lag phase, followed by an exponential rate of increase (log phase). S3: A linear curve is obtained when plotting the parameter of growth against time in systems undergoing geometric growth. S4: The growth rate 'r' in the exponential growth equation (W1 = W0ert) is referred to as the relative growth rate and efficiency index. S5: A typical sigmoid growth curve is characteristic of cells grown in a natural environment and of many higher plants. S6: Growth, whether arithmetic or geometric, is ultimately a reversible permanent increase in size of an organ or its parts.
View solution & NCERT explanation
Correct answer: B — S1, S3 and S6 only
Let's evaluate each statement based on the NCERT text: S1: "In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures." Therefore, this statement is NOT correct. S2: "In most systems, the initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase)." This statement is correct. S3: "On plotting the length of the organ against time, a linear curve is obtained." This applies to arithmetic growth, not geometric growth. Geometric growth produces a sigmoid curve. Therefore, this statement is NOT correct. S4: "Here, r is the relative growth rate and is also the measure of the ability of the plant to produce new plant material, referred to as efficiency index." This statement is correct. S5: "A sigmoid curve is a characteristic of living organism growing in a natural environment. It is typical for all cells, tissues and organs of a plant." This statement is correct. S6: "Growth can be defined as an irreversible permanent increase in size of an organ or its parts or even of an individual cell." Growth is irreversible, not reversible. Therefore, this statement is NOT correct. The statements that are NOT correct are S1, S3, and S6. Final Answer: The final answer is B because statements S1, S3 and S6 are NOT correct.
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