grade 5 , con 3 , lesson 3 &4

Leakage of oil into seawater negatively affects the

• desert organisms.

• forest organisms.

• marine organisms

• rivers organisms.

Fire in forest produces

• smoke only.

• ash only.

• smoke and ash

• oxygen and ash.

Pollutants produced from a forest fire harm all the following, except

• air.

• respiratory system.

• grasses.

• sunlight

As a result of pollution in an ecosystem, the number of living organisms

• decreases

• increases.

• doesn't change.

• is doubled.

Any increase or decrease in the number of organisms of one type of species is known as

• an ecosystem

• adaptation

• climate change.

• population change

Healthy marine environment is important for survival

• humans.

• lions.

• fish

• Deers

All the following are healthy resources for marine food webs, except.....

• clean water and food.

• clean food and shelter

• Clean shelter and water

• polluted water, food and shelter.

When the marine habitats are destroyed, the number of living organisms in their food webs is

• increased.

• decreased

• not changed.

• doubled.

All the following may occur due to habitat loss, except

• increasing of population.

• decreasing of population.

• extinction of some organisms.

• decreasing of resources.

Plastic waste materials cause all the following to the marine environment, except ..........

• breakdown in food webs

• decreasing of population

• pollution of water

• increasing of population.