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In organs of plants there is a variation...

In organs of plants there is a variation in rate of growth. It is first slow, then accelerated upto maximum and slows down to stand still. The period of vigorous growth is known as

A

Lag phase

B

Period of growth

C

Grand period of growth

D

Log phase.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Plant Growth Phases**: Plant growth is characterized by different phases, each with distinct rates of growth. The growth phases include lag phase, log phase, stationary phase, and death phase. 2. **Identifying the Growth Phases**: - **Lag Phase**: This is the initial phase where growth is slow. During this phase, plants are adjusting to their environment and synthesizing necessary biochemicals and nutrients. There is little to no significant growth. - **Log Phase**: This is the phase where growth accelerates significantly. The rate of growth increases rapidly, and the number of cells doubles at an exponential rate. This phase is characterized as the period of vigorous growth. - **Stationary Phase**: In this phase, the rate of cell division equals the rate of cell death. Growth slows down, and the population stabilizes due to limited nutrients. - **Death Phase**: This is the final phase where growth declines due to lack of nutrients and accumulation of toxins. 3. **Identifying the Correct Answer**: The question asks for the period of vigorous growth. Based on the definitions of the phases: - The **log phase** is identified as the period of vigorous growth where the growth rate is at its maximum. 4. **Conclusion**: Therefore, the correct answer to the question is **log phase**.
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