Tag: plant growth

Quizzes (10) Questions (270)

Questions Related to plant growth

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

In growth curve, maximum growth occurs during

  1. Lag phase

  2. Senescent phase

  3. Decline phase

  4. Exponential phase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Bacterial growth is divided into four phases, namely lag phase, exponential phase, stationary phase and decline phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to the environment and synthesizing biochemicals and nutrients. In log phase, the number of bacterial cells doubles at an exponential rate. The maximum growth phase is the exponential phase. In stationary phase, the rate of cell death is equal to the rate of cell division. In decline phase, there is the decrease in the bacterial population due to lack of nutrients and high toxin concentration.
Thus, the correct answer is option D.
Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Ectomycorrhiza is an association of ________.

  1. Bacterial and plant roots

  2. Cyanobacterial and plant root

  3. Fungi and plant roots

  4. Bacteria and fungi
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ectomycorrhiza is a symbiotic association between fungi and the roots of higher plants, where the fungal hyphae form a sheath around the root and inter-cellularly network in the cortex.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Process, container is being emptied into collection vehicles at point of collection is known as:

  1. Hauled Container System

  2. Stationary Container System

  3. Collection System

  4. Pulverization
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a stationary container system, the collection vehicle travels to the site, empties the container, and moves to the next, whereas in a hauled container system, the entire container is removed.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Growth curve is

  1. S-shaped

  2. Sigmoid

  3. L-shaped

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In most systems, the initial growth is slow (lag phase), and it increases rapidly thereafter,  at an exponential rate (log or exponential phase). Here, both the progeny cells following mitotic cell division retain the ability to divide and continue to do so. However, with limited nutrient supply, the growth slows down leading to a stationary phase. If we plot the parameter of growth against time, we get a typical sigmoid or S-curve. 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.

Thus, the correct answer is option D.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

The usual shape of growth curve is 

  1. Linear

  2. Inverted bell shaped

  3. Sigmoidal

  4. Zig-zag
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is a 'S' shaped curve obtained when we plot growth against time. It is also called as sigmoid curve. This curve mainly shows four phases of growth -
1. Initial slow growth (lag phase) .

2. The rapid period of growth (log phase), where maximum growth is seen in a short period.
3. The diminishing phase, where growth will be slow.
4. Stationary phase, where finally growth stops.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

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

  1. Lag phase

  2. Period of growth

  3. Grand period of growth

  4. Log phase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
In organs of plants, there is a variation in rate of growth. Growth is divided into four phases, namely lag phase, log phase, stationary phase and death phase. Lag phase is slow. In this, there is very little or no bacterial growth. In this phase, bacteria are adjusting to environment and synthesizing biochemicals and nutrients. In log phase, the number of bacterial cells doubles at an exponential rate. It is the period of vigorous growth . In stationary phase, the rate of cell death is equal to the rate of cell division. In death phase, there is decrease in the bacterial population due to lack of nutrients and high toxin concentration.
Thus, the correct answer is option D.