Oxygen Cycle

a) Humans and animals

b) Living and nonliving

c) Biology and chemistry

d) Fire and water

a) Water, wind, soil, thermal cycles

b) Nuclear, nutrient, organism, life cycles

c) Water, nitrogen, carbon, oxygen cycles

a) atmosphere, biosphere, hydrosphere

b) atmosphere, biosphere, lithosphere

c) biosphere, lithosphere, hydrosphere

d) lungs, heart, gills

Plants release oxygen through photosynthesis

Aerobic organisms use free oxygen for respiration

Animals take oxygen and release carbon-dioxide

Aquatic animals breathe in carbon dioxide

False

True

a) Breathing, cleansing, playing

b) Soil formation, automobiles, weathering

c) None of these

d) respiration, combustion, decomposition

Atmosphere

Lithosphere

Biosphere

stratosphere

Combustion, ozone layer, oxides

Co2, photosynthesis, combustion

Rusting, seasoning, weathering

Drifting, breaking, carbonisation

photosynthesis

respiration

photolysis

greenhouse effect

O2 gets converted into co2

Co2 gets converted into o2

Co2 and o2 gets mixed in the atmosphere

Plants release co2 and o2

Daytime

Night time

Summer season

Rainy season

For their growth

To reproduce

For respiration