Exponential Growth

Q. Which of the following statements is incorrect about growth?

1. In multicellular organisms growth takes place by cell division.
2. Unicellular organisms do not grow by cell division.
3. In plants growth is a continuous process whereas in animals, growth occurs only upto a certain age.
4. Growth is characterized by increase in number and mass.

Q.

The formula for exponential population growth isThe formula for exponential population growth is

1. N/N =

2. N/ = N

3. /N = N

4. N/N =

Q. All genes located on the same chromosome:

1. Will not form any linkage groups
   
2. Form interactive groups that affect the phenotype
   
3. Form one linkage group
   
4. Form different groups depending upon their relative distance

Q. Which two of the below given points are known as the twin characteristics of growth?
(i) Increase in mass
(ii) Increase in number of individuals
(iii) Cellular organization
(iv) Cellular differentiation

1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv)

Q.

What are the causes of variations?

Q. The correct sequence of stages of growth curve for bacteria is:
1.decline, lag, log phase
2.lag, log, stationary phase
3.stationary, lag, log, decline phase
4.lag, log, stationary, decline phase

Q.

Exponential growth occurs when there is

1. a fixed carrying capacity

2. a great environmental resistance

3. no environmental resistance

4. no biotic potential

Q.

Each gamete has only one allele of a gene

1. True
2. False

Q.

The population of a bee hive is growing with a monthly percentage rate compounded continuously. The population doubles in $3$ months.

Q. Which one is not transcribed by DNA?

1. 
   Introns
2. 
   DNA
3. 
   tRNA
4. 
   Exons

Q. Sometimes cattle or even human beings give birth to their young ones that are having extremely different sets of organs like limbs/position of eye(s) etc. Comment.

Q.

If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population?

Q. Variations during mutations of meiotic recombinations are:

1. random and directionless
2. small and directional
3. random, small and directional
4. random and directional

Q. (a) Name the two growth models that represent population growth and draw the respective growth curves they represent.

(b) State the basis for the difference in the shape of these curves.

(c) Which one of the curves represent the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer. [5]

Q. The formula to calculate the number of individuals in a population undergoing exponential growth is N = rt + ln $N_0$.

1. True
2. False

Q.

Maximum growth occurs in

1. A = g, B = e, C = f, D = h

2. A = q, B = h, C = f, D = e

3. A = g, B = f, C = e, D = h

4. A = q, B = e, C = h, D = f

Q.

How do you determine carrying capacity?

Q. Population growth of a species is not related to which of the following parameters ?

1. For a newly colonized habitat, immigration plays major role than the birth rate
2. $N_{1+1}=dn/dt-\pi N$
3. Under normal conditions, natality and mortality are the most important factors
4. Out of the four basic processes affecting population growth, three lead to increase in population

Q. The population of an insect species increases explosively during the rainy season and then disappears at the end of the season. It shows that:

1. Food plants mature and die at the end of the rainy season
2. Population of predators increases enormously
3. Population growth is logistic
4. Population growth is exponential

Q. The current population growth curve in most animals except humans is

1. S shaped
2. S shaped with tail
3. J shaped
4. J shaped with tail

Q. The semilog of per minute growing bacteria is plotted against time. What will the shape of graph?

1. Sigmoid
2. Hyperbolic
3. Ascending straight line
4. Descending straight line

Q.

A population of 500 that experiences 55 births and 5 deaths during a one-year period. What is the intrinsic rate of natural increase for the population during the one-year period? [1]

(a) 0.11/year

(b) 55/year

(c) 0.1/year

(d) 50/year

Q. If a population growing exponentially double in size in $3$ years, what is the intrinsic rate of increase (r) of the population?

Q. The growth rate of lotus population of 200 where originally 175 lotus were there

Q.

Define the term: Sex-linked traits

Q.

Exponential growth occurs when there is

1. a great environmental resistance

2. no environmental resistance

3. no biotic potential

4. a fixed carrying capacity

Q.

A condition where an organism has different allelic forms of a gene.

Q. Which of the following equation correct represents the exponential population growth curve?

1. dN/dt = rN
2. dN/dt = rN $\left(\frac{K-N}{K}\right)$
3. $N_t=N_0{e}^{r}t$
4. Both A and C
   

Q.

1. Some of the bacteria tried and successfully adapted to the new conditions in the petri dish.
2. Some members of the bacteria population developed a resistance to the antibiotic immediately after exposure.
3. Some members of the bacteria population already had a resistance to the antibiotic so they were not killed.
4. Some of the bacteria quickly evolve into a new species that resist the antibiotic.
5. Some of the bacteria protected themselves from the antibiotic long enough to develop a resistance.

Q. What is the cause of discontinuous synthesis of DNA on one of the parental strands of DNA? What happens to these short stretches of synthesised DNA?