Question

The growth curve obtained in plants is generally:

• A. Linear
• B. Zig-zag
• C. Sigmoid
• D. Circular Correct Answer: (C) Sigmoid

Hint:

To remember this concept easily, think of the letter 'S' for Sigmoid and associate it with Shape! A natural plant growth graph always traces an S-curve, starting with a slow creep (Lag), shooting straight up (Log), and flattening out at the top (Stationary).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
When the growth of a plant organ or an entire organism is measured over a period of time and plotted on a graph (such as plotting weight, height, or cell number against time), it forms a characteristic geometric pattern. This distribution path is called a growth curve. In natural environments where resources become finite over time, living systems exhibit an open-ended growth trajectory that eventually stabilizes as the organism reaches maturity.

Step 2: Detailed Explanation:
Let's analyze the phases that compose a typical plant growth curve: 1. Lag Phase: The initial period of growth where the rate is relatively slow as cells prepare for active division and adapt to their internal or external conditions. 2. Log or Exponential Phase: A period of rapid, geometric acceleration. Here, cells divide and multiply at a maximum rate because nutrients and space are abundant. 3. Stationary Phase: As the plant approaches maturity or resources (like light, water, and nutrients) become limited, the growth rate begins to slow down until it reaches an equilibrium where net growth stops. When these three consecutive phases are plotted sequentially on a line graph, they form a classic S-shaped curve, also mathematically known as a Sigmoid curve. This pattern is a fundamental characteristic of living organisms growing in a natural ecosystem. This matches option (C).

Step 3: Final Answer:
The growth curve obtained in plants is generally Sigmoid.