Five hundred flies of one species were sprayed with a new insecticide. Twenty-four hours later, nearly all the flies were dead. However, a few survived. Which scientific principle best explains why some flies survived?

There is a variation among individuals within a species

Animals adapt to new environments

New species develop from survivors

Insecticides may cause genetic mutations

Many species of bacteria live inside and on the human body. What determines the types of symbiotic relationships that bacteria form with humans?

If they are helping, harming, or not impacting the human

How many individuals are in the population

If there are many species of bacteria to compete with

If the human can take an antibiotic to kill the bacteria

How would a significant decrease in soil nutrients most likely affect plant and animal populations in an ecosystem?

Plant growth would decrease, leading to a decline in herbivores and predator populations.

Plant growth would increase, providing more food for herbivores.

Animal populations would not be affected because they do not rely on soil nutrients.

The ecosystem would remain unchanged because plants can survive without nutrients.

What would most likely happen if a keystone species, such as a top predator, were removed from an ecosystem?

The prey population would increase uncontrollably, disrupting the balance of the ecosystem.

The prey population would decrease because they rely on predators for survival.

The ecosystem would remain unchanged because predators have no major effect.

The predator’s removal would cause all species to go extinct.

Which of the following justifies why no two species can occupy the same niche in the same habitat at the same time?

Because of the competitive exclusion principle

Because of the interactions that shape the ecosystem

Unless the species requires different abiotic factors

Unless the requires different biotic factors

An ecological niche is –

The role a species has in an ecosystem

All the populations in an ecosystem

Which of the following is an example of a density-independent limiting factor that could impact an entire ecosystem?

A drought that reduces water availability for all organisms.

Increased competition for food between predator species.

The spread of disease among a population of rabbits.

A higher birth rate in a population of wolves.

A scientist is studying a population of frogs in a wetland ecosystem. Which of the following observations represents quantitative data rather than qualitative data?

There are 45 frogs in the study area.

The frogs have smooth, green skin.

The frogs make loud croaking sounds at night.

The frogs appear to be very active after rainfall.

Many complex genetic experiments have been performed on plants. One of the very successful ones crossed wild wheat with a fungus-resistant wild grass. This experiment produced a variety of wheat that was resistant to a very destructive parasitic fungus, which kills nonresistant plants. Why does such experimentation help people?

More wheat, an important food crop worldwide, can be harvested.

The fungus could spread to other plants.

The fungus is also dangerous to humans.

Wheat products made from infected plants would taste bad.

A bird's wing, human arm, and a whales' flipper are all adapted to performing different tasks; however, their bones are structurally similar. What does this indicate in evolutionary terms? (Choose two)

They all evolved from a common ancestor.

Whales evolved from a terrestrial ancestor.

It doesn't tell you anything since one flies, one walks, and one swims.

While in the mountains, a student found an imprint of a whale bone and seashells. The mountain was many miles from the ocean. What best explains this find?

The mountain was under water at one time

Erosion washed the fossil from the ocean into the mountains

Birds often carry things from the ocean to the mountains and drop them there

Animals find fossils near the ocean and carry them into the mountains.

The arctic fox is brown in the spring and summer and turns white in the fall and winter. This ability started as a mutation, so it was -

A change in the DNA code and inheritable

Just a random change that was not tied to it's genetic structure

Not able to be passed on to future generations

Observations of different populations of animals contributed to Darwin's theory of natural selection. Which observation can be shown in this population of beetles?

Within a population, there are natural differences in traits or variations.

Environmental resources are limited

Populations don't change over time

Many animals and plants produce more offspring than can possibly survive

During the 1800s, London was part of the industrial revolution. A lot of coal was burned in factories, which caused dark pollution every where. This turned the bark of trees from white to black. How did this affect the moth populations of white and black moths? (Analyze the chart)

The dark colored moths blended in with their environment better and through natural selection increased their numbers

The light colored moths collected food better than the dark colored moths so they survived due to natural selection.

The dark colored moths almost became extinct

The light colored moths adapted to the area more successfully

Look at the table and figure out which statement is an accurate observation of the evolution of the horse.

The earlier fossils have more toes on the forefoot than modern horses.

The fossil differences shown occurred over a very short period of time.

The scull of the modern horse is much smaller than the skull of the Hyracotherium

The sculls of Hyracotherium and Mesohippus indicate a diet similar to modern meat-eaters

7th Grade Q4 CSA Review

Authored by Emani Braxton

Science

7th Grade

NGSS covered

Used 8+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

In the Punnett square shown, what must the genotype of the missing parent be?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

B = brown fur b = white fur
In the Punnett square, what is the probability for white fur?

25%

50%

75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What are the possible genotypes for this cross?
(Click the picture to see it without the text)

TT = 25% Tt= 50% tt=25%

all tall

TT= 75% tt = 25%

Tt = 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the dominant trait?

yellow pea seeds

green pea seeds

there is no dominant seed

Jolly green giant

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What genotype would go in box 3?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What genotype would go in box 1?

Tags

NGSS.HS-LS3-1

MULTIPLE SELECT QUESTION

30 sec • 1 pt

In 1500, between 60 million and 125 million American Bison roamed the plains. Native Americans used these bison as a primary food source, but this did not affect the total bison population. A few hundred years later, railroad crews and settlers moving west depended on bison for food. By 1829, it is estimated that less than 100 bison were left.
What were the two (2) main causes for the near extinction of the bison?

Disease

Overhunting

Loss of habitat

Starvation

Tags

NGSS.MS-LS2-4

NGSS.MS-ESS3-4

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7th Grade Q4 CSA Review

In the Punnett square shown, what must the genotype of the missing parent be?

B = brown fur b = white fur
In the Punnett square, what is the probability for white fur?