Q31 Which two of these populations will grow at the same rat

Q3.1. Which two of these populations will grow at the same rate? (Choose two.)

Check all that apply:

a) A population with birth rate of 0.2 and death rate of 0.1

b) A population with birth rate of 0.4 and death rate of 0.2

c) A population with birth rate of 0.6 and death rate of 0.2

d) A population with birth rate of 0.2 and death rate of 0.0

Q3.2. A guppy farmer is trying to decide how to spend her money to produce guppies faster. She rears a guppy population by adding a few adults to a large pool and then letting the population grow through many generations with plenty of food (no resource limits). Which of the following would you advise her to do?

a) Buy a variety of guppy with a birth rate that is three times higher.

b) Rent two more pools from her neighbor and add the same initial number of guppies to each.

c) Start with three times as many guppies in her one pool.

d) Any of these options should work just as well as the others.

The following passage refers to questions 36-39 below. Read the passage and then the statements that follow. For each question, select the best answer.

A few plant-eating salamanders manage to float on a log to a large island in the Pacific that did not have any other salamander species previously. The salamanders find the island has abundant plants for food and no predators. On average, a salamander has four offspring per year and lives for one year.

Q3.3. How will the population of salamanders change over the first few years?

a) The population will increase steadily by a constant amount each year.

b) The population will increase more rapidly each year than the year before.

c) The population will increase steadily for a few years and then decrease steadily back to 0.

d) The growth in the first few years depends on the size of the island.

Solution

Q.3.1 The correct answers are :

b.A population with birth rate of 0.4 and death rate of 0.2

d.A population with birth rate of 0.2 and death rate of 0.0

Reason:Population growth rate = birth rate - death rate.So, same rate will be seen in case of option b. and d.

Q.3.2.The correct answer is: a) Buy a variety of guppy with a birth rate that is three times higher.

Reason:The above option would be the best option to produce guppies faster.

Q.3.3 The correct answer is : b) The population will increase more rapidly each year than the year before.

Reason:The above option is correct as the salamander has a greater opportunity to produce more offsprings in a new island where food is abundant and no predators are present than previously inhabited island.