Population attributes and age pyramids — practice questions

Question 1 · difficulty L1 · recall

A diagram showing proportions of pre-reproductive, reproductive and post-reproductive individuals:

• A. biomass pyramid
• B. age pyramid
• C. food pyramid
• D. energy pyramid

Question 2 · difficulty L1 · recall

Loss of individuals from a population through death:

• A. immigration
• B. mortality
• C. natality
• D. mutualism

Question 3 · difficulty L1 · recall

The number of individuals per unit area or volume:

• A. age structure
• B. death rate
• C. birth rate
• D. population density

Question 4 · difficulty L1 · recall

The per-capita or population-level addition of new individuals through births:

• A. emigration
• B. natality
• C. mortality
• D. competition

Question 5 · difficulty L2 · understanding

Which population attribute cannot meaningfully be assigned to a single individual?

• A. Age
• B. Body mass
• C. Body temperature
• D. Birth rate

Question 6 · difficulty L3 · understanding

Match List I with List II. List I List II (A) Logistic growth (I) Unlimited resource availability condition (B) Exponential growth (II) Limited resource availability condition (C) Expanding age pyramid (III) The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups (D) Stable age pyramid (IV) The percent individuals of pre-reproductive and reproductive age group are same Choose the correct answer from the options given below:

• A. A-II, B-III, C-I, D-IV
• B. A-II, B-IV, C-I, D-III
• C. A-II, B-IV, C-III, D-I
• D. A-II, B-I, C-III, D-IV

Question 7 · difficulty L3 · application

An age pyramid has a broad base with many pre-reproductive individuals and progressively fewer older individuals. What does this most strongly suggest?

• A. A declining population
• B. An expanding population
• C. A population with no births
• D. A population with identical numbers in all age classes

Question 8 · difficulty L3 · understanding

When will the population density increase, under special conditions? When the number of :

• A. Deaths exceeds number of births and also number of emigrants equals number of immigrants.
• B. Births plus number of immigrants equals number of deaths plus number of emigrants.
• C. Births plus number of emigrants is more than the number of deaths plus number of immigrants.
• D. Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.

Question 9 · difficulty L3 · understanding

If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per year ?

• A. 10
• B. 9
• C. 25
• D. 15

Question 10 · difficulty L3 · understanding

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila per week.

• A. 0.1
• B. 10
• C. 1.0
• D. zero