grade 5 , con 3 , leeson 3

Leakage of oil into seawater negatively affects the

• desert organisms.

• marine organisms.

• forest 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.

• a climate change.

• a population change.

If the climate changes suitable, the population of a species

• will die.

• will not be affected.

• will decrease.

• will increase.

Seabirds build their nests

• on the water surface.

• on the top of mountain cliffs.

• deep down into the sea.

• deep down into the river.

All the following statements are correct, except

• small fish can eat seabirds.

• sharks can eat small fish.

• small fish cannot eat seabirds.

• seabirds cannot eat sharks.

The suitable habitat for microorganisms to survive is

• hot water.

• warm water.

• cold water.

• boiled water.

Forest fire negatively affects the marine organisms.

• TTrue

• FFalse