2. Air
2. Air

233050 What is released in the air from the burning of fuels?

1 Carbon di oxide.
2 Helium.
3 Nitrogen.
4 Argon.
2. Air

233051 Which gas is used by the green plants to make their food?

1 Oxygen.
2 Carbon dioxide.`
3 Nitrogen.
4 None of these.
2. Air

233052 Which of the following gases protects us from harmful sun vays?

1 Carbon dioxide.
2 Nitrogen.
3 Ozone.
2. Air

233053 How ozone layer is important to us?

1 Protect us from weather changes.
2 Protect us from harmful rays.
3 Protect us from rain.
4 None of these.
2. Air

233050 What is released in the air from the burning of fuels?

1 Carbon di oxide.
2 Helium.
3 Nitrogen.
4 Argon.
2. Air

233051 Which gas is used by the green plants to make their food?

1 Oxygen.
2 Carbon dioxide.`
3 Nitrogen.
4 None of these.
2. Air

233052 Which of the following gases protects us from harmful sun vays?

1 Carbon dioxide.
2 Nitrogen.
3 Ozone.
2. Air

233053 How ozone layer is important to us?

1 Protect us from weather changes.
2 Protect us from harmful rays.
3 Protect us from rain.
4 None of these.
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2. Air

233050 What is released in the air from the burning of fuels?

1 Carbon di oxide.
2 Helium.
3 Nitrogen.
4 Argon.
2. Air

233051 Which gas is used by the green plants to make their food?

1 Oxygen.
2 Carbon dioxide.`
3 Nitrogen.
4 None of these.
2. Air

233052 Which of the following gases protects us from harmful sun vays?

1 Carbon dioxide.
2 Nitrogen.
3 Ozone.
2. Air

233053 How ozone layer is important to us?

1 Protect us from weather changes.
2 Protect us from harmful rays.
3 Protect us from rain.
4 None of these.
2. Air

233050 What is released in the air from the burning of fuels?

1 Carbon di oxide.
2 Helium.
3 Nitrogen.
4 Argon.
2. Air

233051 Which gas is used by the green plants to make their food?

1 Oxygen.
2 Carbon dioxide.`
3 Nitrogen.
4 None of these.
2. Air

233052 Which of the following gases protects us from harmful sun vays?

1 Carbon dioxide.
2 Nitrogen.
3 Ozone.
2. Air

233053 How ozone layer is important to us?

1 Protect us from weather changes.
2 Protect us from harmful rays.
3 Protect us from rain.
4 None of these.