Grade 7 Interactions and Ecosystems

Question 1

The pH of the Great Lakes is 8. If they were subjected to acid rain, what would to happen?

Accepted Answer

pH would decrease

Question 2

How does the typical N. American ecological footprint compare to those of the rest of the world

Accepted Answer

The N. American is about 3X as much the rest of the world.

Question 3

We get electricity by controlling water flow with large dams. Which of the following is true?

Accepted Answer

It is an example of how humans use natural resources.

Question 4

Without protection for natural habitats, Earth may lose _________________

Accepted Answer

all of the above

Question 5

Why can pollutants, such as PCBs, have long-term negative effects on an ecosystem?

Accepted Answer

They take a long time to break down to a non-damagingform

Question 6

What is precipitation?

Accepted Answer

rain, sleet, snow, or hail

Question 7

Ecology comes from the Greek word with which of the following meanings?

Accepted Answer

Home

Question 8

How did DDT affect peregrine falcons?

Accepted Answer

Eggshells became so fragile the chicks could not survive.

Question 9

An orchid attached to a tree is commensalism, a symbiotic relationship. Commensalism means?

Accepted Answer

The orchid benefits, the tree neither benefits or is harmed.

Question 10

Plants use ____________________ to make food and release __________________ to the environment.

Accepted Answer

carbon dioxide, oxygen

Question 11

Which is the most effective way to reduce your ecological footprint?

Accepted Answer

Ride a bicycle

Question 12

Whichof the following are examples of abiotic parts of an environment?

Accepted Answer

water and soil

Question 13

A(n) ______________represents the number of organisms involved in each level of a food chain

Accepted Answer

pyramid of numbers

Question 14

What is the effect of using car pools, taking quick showers, and buying locally grown produce?

Accepted Answer

reduces ecological footprint

Question 15

________occurs when harmful substances enter a food web and build up in higher-level consumers.

Accepted Answer

Bioaccumulation

Question 16

How will cutting down the rain forest affect the air quality?

Accepted Answer

There will be a decrease in the oxygen contentof the air.

Question 17

Tiana is monitoring changes in a forest over time. The forest is huge. What should Tiana do?

Accepted Answer

use a number of permanent plots that she can study

Question 18

Which one of the following statements about an organism's niche in a community is true?

Accepted Answer

One organism usually fills several niches

Question 19

_______________is the development of an ecosystem in an area that was initially bare.

Accepted Answer

Primary Succession

Question 20

What is a change from a liquid to a vapour called?

Accepted Answer

evaporation

Question 21

Your teacher asks you which ofthe four basic needs provides you with nutrition and energy.

Accepted Answer

food

Question 22

Most communities use landfill sites. What are these sites?

Accepted Answer

places for disposing garbage

Question 23

A Food pyramid of grass, grasshoppers, robins and cats. Which will provide the least organisms?

Accepted Answer

cats

Question 24

Which of the following is true about cycles?

Accepted Answer

All of the above

Question 25

Families reduce the amount of garbage by composting. What other activity is like composting?

Accepted Answer

decomposing

Question 26

Algae, perch, and mosquito larvae can be found in a pond. Identify the producer(s).

Accepted Answer

algae

Question 27

What are four examples of natural resources?

Accepted Answer

oil, water, trees, minerals

Question 28

What word describes a relationship between two organisms where both benefit from being together

Accepted Answer

mutualism

Question 29

What are the four basic needs of living things as you decide how to care for your new pet?

Accepted Answer

food, habitat, air for gas exchange, water

Question 30

Climate, weather and temperature changes in an ecosystem may be tracked through what activity?

Accepted Answer

Environmental monitoring

Question 31

_________________means that resources are being replenished and that wastes are being absorbed.

Accepted Answer

Sustainability

Question 32

A species becomes _______________when only a small number of its members are living

Accepted Answer

endangered

Question 33

Clearing forested land for farming often results in a reduction of birds. Why might this occur?

Accepted Answer

A and B are both correct

Question 34

Many of the plants that grow in Hawaii would not survive in Canada. Why?

Accepted Answer

appropriate habitat

Question 35

___________________are harmful substances released by humans into the environment.

Accepted Answer

Pollutants

Question 36

Many forests burn and then regrow after, what term best describes this?

Accepted Answer

secondary succession

Question 37

Which of the following is an example of a "want?"

Accepted Answer

a hot shower each day

Question 38

Which "R" are you practicing when you pass used clothing on to another person?

Accepted Answer

re-use

Question 39

Bacteria are killing the plants shown in the food web. Which of the following is true.

Accepted Answer

All the organisms would benegatively affected by this event.

Question 40

Some species are at risk of no longer existing. This means that they could become_____________

Accepted Answer

extinct

Question 41

How can North Americans reduce their ecological footprint?

Accepted Answer

A and B are both correct.

Question 42

To see changes occurring in an ecosystem, a scientist would want to engage in which activity?

Accepted Answer

Long-term monitoring

Question 43

_________________looks at changes in populations of organisms or in organisms themselves

Accepted Answer

Biological monitoring

Question 44

Dr's think antibiotics are given out too freely. What is the result of overuse of antibiotics?

Accepted Answer

Antibiotics are becoming ineffective against somediseases

Question 45

What type of food gathering has the greatest impact on our environment?

Accepted Answer

feedlots that produce cattle for meat

Grade 7 Interactions and Ecosystems

Questions 45

Grade 7 Interactions and Ecosystems

Questions 45