Geometric Growth

Q. What is the difference between absolute growth, rate relative growth rate, geometric growth rate and Arthmetic growth rate

Q. Geometric growth is seen in

1. zygote during embryogenesis.
2. explant in tissue culture.
3. bacteria in rich nutrient culture.
4. meristematic cells in root tip.

Q. Linear curve is obtained in arithmetic growth, because:

1. It has lag, log and stationary phase
2. One daughter cell remains meristematic while the other daughter cell differentiates and matures
3. Of the effect of environment on mitosis
4. Of the ability of the plant to produce new plant material

Q. Arithmetic growth includes all the following except:

1. Constant growth rate
2. It is found in root and shoot cells
3. Its characteristic graph is sigmoid
4. It is expressed as $L_t=L_0+rt$

Q.

A culture of the bacterium Salmonella enteritidis initially contains $50$ cells.

When introduced into a nutrient broth, the culture grows at a rate proportional to its size.

After $1.5$ hours, the population has increased to $775$.

$\left(a\right)$ Find an expression for the number of bacteria after $t$ hours. (Round your numeric values to four decimal places.) $P\left(t\right)=$ ________

$\left(b\right)$ Find the number of bacteria after $5$ hours. (Round your answer to the nearest whole number.) $P\left(5\right)=$______ bacteria

$\left(c\right)$ Find the rate of growth (in bacteria per hour) after $5$ hours. (Round your answer to the nearest whole number.)$P\left(5\right)=$ ______ bacteria per hour

$\left(d\right)$ After how many hours will the population reach $250,000$? (Round your answer to one decimal place.) $t=$ _______ hr.

Q. In unicellular organisms, growth and reproduction both lead to increase in number of cells.

1. True
2. False

Q. Which of the following statement is true for growth in unicellular organisms like bacteria?

1. They increase in size.
2. They increase in mass.
3. They increase in number.
4. Both (a) and (b).

Q. In angiosperms, triple fusion produces

1. Zygotic nucleus
2. Secondary nucleus
3. Polar nucleus
4. Primary endospermic nucleus

Q. Growth is one of the characteristic of all living organisms? Do unicellular organisms also grow? If so, what are the parameters?

Q. The following data were obtained from an experiment on 2 plant samples showing exponential growth: $\begin{array}{cccc}\text{Sample}& \text{Initial weight}& \text{Final weight (in grams)}& \text{Time of growth(in}\\ & \text{grams)}& & \text{seconds)}\\ \text{A}& 107& 321& 15\\ \text{B}& 723& 1446& 16\end{array}$
Can you determine which sample is growing faster?

1. A
2. Cannot be determined
3. B
4. They are growing at equal rates

Q. Zygote exhibits growth which is represented by a sigmoid growth curve.

1. arithmetic
2. geometric
3. logarithmic

Q. Zygote exhibits growth which is represented by a sigmoid growth curve.

1. arithmetic
2. geometric
3. logarithmic

Q. Period between formative phase and maturation phase of plant growth is

1. Lag phase
2. Phase of elongation
3. Stationary phase
4. Grand period of growth

Q. The following data were obtained from an experiment on 2 plant samples showing exponential growth: $\begin{array}{cccc}\text{Sample}& \text{Initial weight}& \text{Final weight (in grams)}& \text{Time of growth(in}\\ & \text{grams)}& & \text{seconds)}\\ \text{A}& 107& 321& 15\\ \text{B}& 723& 1446& 16\end{array}$
Can you determine which sample is growing faster?

1. A
2. B
3. They are growing at equal rates
4. Cannot be determined

Q. During which phase of growth, cell increases in volume

1. Exponential
2. Enlargement
3. Cell division
4. Differentiation

Q. The following data were obtained from an experiment on 2 plant samples showing exponential growth: $\begin{array}{cccc}\text{Sample}& \text{Initial weight}& \text{Final weight (in grams)}& \text{Time of growth(in}\\ & \text{grams)}& & \text{seconds)}\\ \text{A}& 107& 321& 15\\ \text{B}& 723& 1446& 16\end{array}$
Can you determine which sample is growing faster?

1. A
2. B
3. They are growing at equal rates
4. Cannot be determined

Q. Enumerate the applications of the plant tissue culture technique.

Q. In tissue culture, embryoids are formed from pollen grains due to________.

1. Organogenesis
2. Cellular totipotency
3. Test tube culture
4. Double fertilization

Q. Maximum growth is observe in ........ phase.

Q. The simplest expression of arithmetic growth is exemplified by