Assessment-Variations in Pops (Other Teachers)

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In a population of spiders there are three different sizes: small, medium, and large.
---The large spiders are easily seen by predators.
---Small spiders have a difficult time finding food.

Small Variant	Medium Variant	Large Variant

What will most likely happen to this population of spiders after many generations?

a.	Large spiders will learn to hide from predators
b.	Medium spiders will be the most plentiful
c.	Small and large spiders will mutate
d.	Small and medium spiders will be the least plentiful

This data table shows the percentage of individuals in a population of insects that were killed by two different insecticides.

Insect Termination Percentages
Population	Insecticide 1	Insecticide 2
1	12.8 %	48.5 %
2	52.5 %	2 %
3	28.6 %	9.2 %
4	0 %	0 %
5	2.8 %	66.6 %
6	3.6 %	78.5 %

Two-part question:
Part 1: Which population would be most affected from the first insecticide?
Part 2: Which population would be least affected from the second insecticide?

a.	Population one is most affected by insecticide 1. Population two is least affected by insecticide 2.
b.	Population four is most affected by insecticide 1. Population two is least affected by insecticide 2.
c.	Population two is most affected by insecticide 1. Population four is least affected by insecticide 2.
d.	Population five is most affected by insecticide 1. Population six is least affected by insecticide 2.

One population of rabbits in a meadow near a forest in Canada contained four variants
1) Rabbits that could run faster
2) Rabbits that had light colored fur (white or gray)
3) Rabbits with dark colored fur (black or brown)
4) Rabbits that had larger ears
From 1987 to 1988 the climate changed so that the winter lasted much longer than usual.

Which variant of rabbits most likely benefited during this period of climate change?

a.	The rabbits with larger ears were the best adapted to this change in climate.
b.	Rabbits with darker colored fur benefited and increased in numbers.
c.	Rabbits with lighter colored fur benefited and increased in numbers.
d.	The faster rabbits had a significant advantage over the slower rabbits.

This data table shows the percentage of individuals in a population of insects that survived after the application of two different insecticides.

Insect Survival Percentages
Population	Insecticide 1	Insecticide 2
1	12.8 %	48.5 %
2	52.5 %	2 %
3	28.6 %	9.2 %
4	0 %	0 %

Two-part question:
Part 1: Which population would be most affected from the first insecticide?
Part 2: Which population would be least affected from the first insecticide?

a.	Population two is most affected, and population three is least affected.
b.	Population four is most affected, and population two is least affected.
c.	Population one is most affected, and population two is least affected.
d.	Population two is most affected, and population four is least affected.

The following table shows four different populations of bacteria and the percentages that are resistant to different antibiotics.

Population	Antibiotic X	Antibiotic Y	Antibiotic Z
1	17.1 %	0.0 %	30.1 %
2	46.9%	18.4%	0.0%
3	95.1 %	1.6 %	82.0%
4	3.3 %	26.6 %	4.1%

If all four populations start with the same number of bacteria, which population
will have the fewest number of survivors when treated with Antibiotic Z?

2nd population

1st population

4th population

3rd population

The picture below shows male stag beetles that have different mandible types.

Image A	Image B

---Male beetles with large mandibles are best at guarding burrows where females have laid eggs (see image A above).
---Males whose mandibles are absent are best at digging alternate entrances to a guarded burrow to reach females (see image A above).
---The table shows the number of male stag beetles with different mandible types in one population (see image B above).

Based on this information, which two mandible types will probably become less common in this population over time?

a.	Absent and Medium	c.	Large and Medium
b.	Absent and Small	d.	Small and Medium

1st Year: A farmer spayed an insecticide on his crops, and it killed 100% of the aphids.
2nd Year: He used the same insecticide the next year, but it only killed 75% of the aphids.
3rd year: He used the same insecticide the 3rd year, but it only killed 50% of the aphids.
----In other words, the aphid population became resistant to this insecticide.

Aphid	Farmer	Aphid

How does this process occur?

a.	The plants displayed a structural adaptation to the insecticide. Each year after being sprayed, the plants slowly changed their physical characteristics to repel the insects.
b.	The insects displayed a behavioral adaptation by flying away each year when the farmer was spraying. Then the next year they returned in larger numbers.
c.	A small percentage of bugs were not effected in the first year of spraying. These survivors then passed along their insecticide resistant genes to the next generation.
d.	This process is called natural selection. It occurs when organisms randomly move from one territory to another. The insects simply moved around each year.

Variation happens as a result of the exchange of genetic information as it is passed from
parent to offspring.
Which of the following is true about inherited variation?

a.	Variation can influence the amount of rainfall in an ecosystem
b.	Variation can influence the resources that are available to an organism.
c.	Variation can influence the amount of available food in an ecosystem
d.	Variation can influence whether organisms are more likely to survive to reproduce.

The habitat of a moth species included trees with both light and dark colored bark.
Therefore the moth species included both light and dark colored variants.

Then the light-colored trees were wiped out by a disease, and within a few years nearly all the moths in this forest were dark colored
Which of the following choices BEST explains what happened?

a.	The light moths changed their wing pigments to darker colors to avoid being eaten.
b.	The dark moths were less visible to predators, so mostly light moths were eaten.
c.	The light moths that survived all had dark offspring in order to adapt to the change.
d.	The few light moths that survived did not mate, and therefore they had no offspring.

10.

A population of birds only ate seeds from two different types of trees. About half of the birds had smaller beaks for eating small seeds, and the other half had larger beaks for eating big seeds.

Smaller Beak	Larger Beak

A drought occurred over several years, and it killed off all of the trees with the small seeds. At the end of this dry period, nearly all the birds had larger beaks.
How is this best explained?

a.	The birds with larger beaks killed and ate the birds with smaller beaks.
b.	Larger beaked birds were better at eating the large seeds from the trees that survived.
c.	A new predator arrived in this ecosystem, and it only ate small beaked birds.
d.	The small-beaked birds grew larger beaks so they could eat big seeds.