Useful and harmful materials to the environment

Burning of old tires

• Useful activity

• Harmful activity

Smoke belching vehicles emit gases that cause change in the

composition of air. Which of the following is true about air pollution?

• A. Difficulty in breathing may happen due to harmful gases.

• B. Difficulty in eating due to loss of appetite.

• C. It results in clean rainwater.

• D. No change will happen.

Recycling plastic bottles

• Useful activity

• Harmful activity

Making compost pit

• Useful activity

• Harmful activity

dumping garbage on the street corner

• Useful activity

• Harmful activity

Using eco bag when buying groceries

• Useful activity

• Harmful activity

Waste from factories that reach bodies of water causes change in the

water environment. Arrange the harmful effects in their proper sequence.

I. Fish die

II. Change in the smell of water

III. Change in the color of water

• I, II, III

• II, III, I

• III, II, I

Household waste may change chemically that may cause harmful effects

to the environment. Q: Which of the following is the harmful effect of improper

disposal of household waste?

• A. Humans may acquire diseases.

• B. Bad odor may come from decayed wastes

• C. The population of pest animals may increase.

• D. The community or surroundings may look unpleasant.

Which of the following should be practiced, to avoid the harmful effects

of change in materials to the air?

• dispose waste properly

• take shower in rainwater

• check vehicles regularly

• store foods in proper temperature

Which of the following should be done to make rotten vegetables and fruit scraps became useful?

I. burn them

II. throw them away anywhere

III. put them in a compost pit to become fertilizer

IV. collect and process them for animals feeds

• I only

• II and III

• III and IV

• II and IV