Introduction:
The mean number of progenies that a woman produces during her life span is called thenet reproductive rate
. The reproductive rate is calculated by the given formula:
Where,
S = sum of all age class,
Answer to Problem 4TY
The correct answer is option (c) 1.75
Explanation of Solution
Explanation/justification for the correct answer:
Option (c) 1.75
Given table:
Age | No. alive at start of year |
Number dying during year, |
Age-specific survivorship rate, |
Age-specific fertility |
|
0 | 100 | 35 | 1 | 0 | 0 |
1 | 65 | 0.65 | 0 | 0 | |
2 | 45 | 15 | 3 | 1.35 | |
3 | 30 | 20 | 0.30 | 1 | |
4 | 10 | 10 | 0.10 | 1 | 0.10 |
5 | 0 | 0 | 0 | 1 | 0 |
Some values are missing in the given table. So, firstly calculate the missing values and put them in the new table:
Calculating the missing value of
Where,
So,
65 individuals were alive at the start of 1st year
And only 45 individuals were alive at the start of the 2nd year
Putting the values in above formula:
Hence, the number of individual dying during year (
Calculating the missing value of
Where,
Zero (0) at subscript = age
Individuals were alive at the start of 2ndyear
Individuals were alive at the start of zero (0) year
Putting the given value in above formula:
Hence the age-specific survivorship rate of the individual at the 2nd age is 0.45
Calculating the missing value of
Given the values of
Putting the given values in
Hence the value of
Putting the calculated values of points (A), (B), and (c) and making refresh table again:
Age | No. alive at start of year |
Number dying during year, |
Age-specific survivorship rate, |
Age-specific fertility |
|
0 | 100 | 35 | 1 | 0 | 0 |
1 | 65 | 20 | 0.65 | 0 | 0 |
2 | 45 | 15 | 0.45 | 3 | 1.35 |
3 | 30 | 20 | 0.30 | 1 | 0.30 |
4 | 10 | 10 | 0.10 | 1 | 0.10 |
5 | 0 | 0 | 0 | 1 | 0 |
Now finding the net reproductive rate
from above fresh table:
Hence, the net reproductive rate
So, this is the correct option.
Explanation for incorrect answer:
Option (a) 5. As explained in option (c), the net reproductive rate is not matched to given data. So, this is an incorrect option.
Option (b) 2.5. As explained in option (c), the net reproductive rate is not matched to given data. So, this is an incorrect option.
Option (d) 1.45. As explained in option (c), the net reproductive rate is not matched to given data. So, this is an incorrect option.
Option (e) 0.80. As explained in option (c), the net reproductive rate is not matched to given data. So, this is an incorrect option.
Want to see more full solutions like this?
Chapter 43 Solutions
Gen Combo Principles Of Biology; Connect Access Cards
- What is the flask’s carrying capacity for rotifers in the presence of water fleas? a. 0 b. 4,200 c. 3,000 d. 1,800arrow_forwardWhat kind of consumer an adult frog is? Support your answer.arrow_forwardLet’s look at our population of 5,000 individuals (N) with a growth rate (r) of 0.01. What if K = 10,000? How many more individuals will be added during the next year? 10 15 25 50 75arrow_forward
- We are at a global population of 7.5 billion. Have we reached carrying capacity? Why or why not?arrow_forwardCalcuate the lx(Survivorship which is equal to proportion of population surviving from birth) and survivorship per 1000 individuals S1000= lx*1000. Calculate Fecundity bxarrow_forwardIf H2O2 (Hydrogen Peroxide) is compared between the sedentary person and the active, who has the higher production? Group of answer choices Active Person Sedentary Person It is the same for either sedentary or activearrow_forward
- In January 2010, a population of organisms had a size of 564. By the end of the year 109 of those individuals had died, but 384 were born. what is the net reproduction per capita for this population?arrow_forwardWhat is the total fertility rate (TFR)? Why is the replacement fertility for humans approximately 2.1? How is Europe’s TFR affecting its rate of natural increase?arrow_forwardAt what general size does a fish population have the greatest potential for growth and reproduction?arrow_forward
- What do you think the carrying capacity is, and what should be do about a growing population?arrow_forward1.) If a person weighs 50 kilograms how many kilograms of meat and vegetables could he have possible eaten? 2.) If people will kill the snakes and shrew. What organisms in the Example will have population explosion?arrow_forwardOne farmer consumes one-half (0.5) chicken per day for a year One chicken consumes 40 grasshoppers per day 1,200 grasshoppers have a mass of one kilogram One grasshopper requires 25 grams of soybeans per year One human requires 750 grasshoppers per day Soybeans have 3.2 calories per gram 1a. Suppose the farmer chose to eat grasshoppers instead of chickens. How many people could the grasshoppers feed, compared to the one person that the chicken fed? 2a. The farmer needs to consume 3,500 calories per day. If he ate only soybeans instead of the chickens or grasshoppers, how many people would his soybean crop feed? 3a. Create a Biomass Pyramid using the data you have developed up to this point. At each trophic level, record the biomass of the organisms over a period of one year needed to support one farmer. Assume that a farmer weighs 75 kg and a chicken weighs 1.5 kg. The pyramid may be set up like this: 4a. Should people eat at a lower trophic level? Outline three pros and three cons of…arrow_forward
- Nutrition: Concepts and Controversies - Standalo...Health & NutritionISBN:9781305627994Author:Frances Sizer, Ellie WhitneyPublisher:Brooks ColeHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781337408332Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781305073951Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage Learning