grade 4 , lessob 4&5

Both of human and fish

• can breathe in air.

• can breathe in water.

• use oxygen gas to breathe in.

• use carbon dioxide gas to breathe in.

Fish use........... to breathe in water.

• tail

• eyes

• Gills

Gills differ from lungs, in that gills

• take in oxygen gas.

• extract oxygen gas from water.

Gills in fish are considered as

• behavioral adaptation.

• camouflage adaptation.

• structural adaptation.

• behavioral and structural adaptations.

All of the following human activities can negatively affect the nature, except

• cutting down forests.

• farming and clearing lands.

• removing air pollutants.

• throwing wastes in waterways.

Human activities and bad habits of an ecosystem. can pollute

• air and soil only

• soil and waterways only

• air and waterways only

• air, soil and waterways

Pollution of an ecosystem can affect...........

• plants and animals only.

• animals and humans only.

• humans and plants only.

• plants, animals and humans.

If the environment is slowly changed, plants.......... to survive and grow.

• must have a taproot

• must have buttress roots

• must decrease their adaptation

• must land their seeds in another better place

From the negative effects of human activities on the human health are ...........

• lung damage and asthma.

• asthma and wounds.

• heart problems and wounds.

• lung damage and wounds.

Human can help restoring ecosystem by all of the following activities, except

• replanting the cleared forests.

• removing air and water pollutants.

• producing more factories exhausts.

• preserving existed plants and animals.