Ecosystems

Ecosystems and competition

year 8

Multiple Choice

Toothpaste contain .................. that neutralize acid formed by bacteria.

• alkali

• acid

• antacid

• slaked lime

Multiple Choice

.............................. + sodium hydroxide --> sodium chloride + water

• Nitric acid

• Sulphuric acid

• Hydrochloric acid

• Ethanoic acid

Multiple Choice

Complete the word equation below:

Acid + alkali --> ............... + water

• water

• salt

• gold

• metal

Multiple Choice

Alkalis are source of

• hydrogen ions

• hydroxide ions

Multiple Choice

Acids are source of

• hydrogen ions

• hydroxide ions

Multiple Choice

A neutralization reaction will always produce...

• water & salt
• water
• salt
• water & carbon

Multiple Choice

Acid + Alkali --> Salt + Water

• neutralization reaction

• synthesis

• decomposition

• single displacement

Multiple Choice

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer
• Water

Multiple Choice

The pH scale is a range from:

• 1-7
• 0-14
• 1-14
• 1-20

Multiple Choice

Strong acids and strong alkalis are.......

• Able to turn blue litmus paper red

• Corrosive

• Sour

• Sweet

Multiple Choice

What colour is universal indicator in a neutral solution?

• Green
• Orange
• Purple
• Red

Multiple Choice

What colour is universal indicator in a strong alkali?

• Green
• Orange
• Purple
• Red

Open Ended

Write down the definition of an eco system. In the previous slide you looked at a picture, what do you think an eco system is?

Open Ended

Find the definition of the term niche?

d

Open Ended

Find the definiton of the term competition in the ecosystem? Give an example!

Multiple Choice

Plants compete for air, water, ________ within ecosystems.

• space, and sound
• sunlight, and wind
• space, and sunlight

Multiple Choice

Air, water, and sunlight are all ________ components of an ecosystem.

• factors
• nonliving
• man-made
• living

Multiple Choice

Organisms are the ________ things in an ecosystem.

• factors
• nonliving
• resources
• living

Multiple Choice

Ecosystems depend on organisms to ________ with each other to maintain stability.

• interact
• build
• eat
• grow

Multiple Choice

For populations to continue to survive, some organisms in the population must _________.

• grow
• reproduce
• eat
• die

Multiple Choice

Environments include both _____ and _____ things.

• resources; factors
• air; water
• living; nonliving
• buildings; animals

Multiple Choice

Living things depend on many different _________ in order to survive.

• resources
• environments
• ecosystems
• interactions

Multiple Choice

What is the difference between a community and an ecosystem?

• They are not different at all.
• A community is how living things that have something in common work together and an ecosystem is living and nonliving things working together.
• Only an ecosystem works together.
• Only a community works together. 

Multiple Choice

A group of bunnies living in the forest is an example of a __________.

• Population
• Ecosystem
• Individual
• Community

Multiple Choice

All the plants and animals that live in the same place is a ____________.

• Population
• Individual
• Ecosystem
• Community

Multiple Choice

One plant or animal is a ___________.

• Population
• Ecosystem
• Community
• Individual

Multiple Choice

An ecosystem is a community of animals and plants interacting with their ____________.

• habitat
• climate
• environment
• community