Question 22 Given the net recruitment curve (solid line), which of the three har

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Question 22

Given the net recruitment curve (solid line), which of the three harvesting rates (dashed lines) would best achieve the Maximal Sustainable Yield?

Question 22 options:

Harvest rate I

Harvest rate II

Harvest rate III

All of the above

None of the above

Question 23

Term referring to the process in which certain compounds increase in concentration within biotic tissues as they move up through foodwebs.

Question 23 options:

Biomagnification

Bioenlargement

Bioassimilation

Bioconsumation

Question 24

_____ % of all species that have lived on earth are now extinct.

Question 24 options:

<1

<10

<50

>99

Question 25

Organism with a 20% probability of becoming extinct over the next 20 years (or 10 generations) are referred to as…

Question 25 options:

Safe from extinction

Vulnerable (Threatened)

Endangered

Critical

Lost cause

Question 26

Ecology is best defined as…

Question 26 options:

A)

B)

C)

D)

Question 27

Species with different evolutionary histories (ancestries) that resemble each other in body form have under gone what form of evolution? Example: The physical similarity of body shape in dolphins, sharks, and penguins.

Question 27 options:

Parallel evolution

Geographic isolation

Convergent evolution

Divergent evolution

Question 28

Which of the following is NOT correct? CAM and C4 plants_________ compared to C3 plants.

Question 28 options:

are more economical in their use of water

open there stomata more frequently and for longer lengths of time

are typically found in hotter and more arid areas

reach their maximum photosynthetic rates at high radiation intensities

Question 29

Which of the following is NOT a characteristic of the northern boreal forest (taiga) biome?

Question 29 options:

Prolonged winters (>6 months)

Extreme temperatures (-70 to +30 oC)

Thin, nutrient poor soils

High biodiversity in the understory

Question 30

The genetic makeup of an organism is its _______, whereas its physical appearance is its _______.

Question 30 options:

phenotype/genotype  

fitness/selective value

selective value/fitness

genotype/phenotype

Question 31

In which of the following terrestrial biomes do we see the greatest amount of species diversity?

Question 31 options:

Tundra

Temperate grassland

Savanna

Tropical Rainforest

Question 32

An adaptation is…

Question 32 options:

feature of an organism that increases its fitness

a change in the genotypic frequencies

resemblance to another species

dependent upon close kinship

Question 33

A population is defined as…

Question 33 options:

a group of non-randomly mating organisms.

a group of subspecies inhabiting several regions.

a group of individuals of the same species inhabiting a defined area.

a group of individuals reproductively isolated from other such groups.

Harvest rate I

Harvest rate II

Harvest rate III

All of the above

None of the above

Explanation / Answer

22. The answer is Harvest Rate II . The solid line in the graph of population size plotted against the recruitment rate shows how competition affects the yield and also how decreased population reduces the yield. Thus the maximum sustainable yield (MSY) is at the point where population is at optimal level for harvesting . This condition is fulfilled by the harvest rate II . One should remember that it is not the maximum but the optimum population level where the MSY occurs.

23. The process where the concentration of certain chemical compounds increases in the biotic tissues at higher trophic levels is called biomagnification. E.g. suppose the goats feeds on the grass with some level of pesticides and those goats are consumed by a tiger. The level of pesticide found in the tiger will be much larger than in the grass as the number of goats consumed by the tiger will be higher and thus greater the concentration of pesticide.

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