Question 1:
Name three types of nutrient cycles.
Answer:
Carbon cycle, oxygen cycle and water cycle
Name three types of nutrient cycles.
Answer:
Carbon cycle, oxygen cycle and water cycle
Question 2:
Give two processes that change the state of matter in the water cycle.
Answer:
Evaporation and condensation
Give two processes that change the state of matter in the water cycle.
Answer:
Evaporation and condensation
Question 3:
Explain the role of organisms in the carbon cycle and oxygen cycle.
Answer:
Plants and animals use oxygen and release carbon dioxide during respiration.
Through the process of photosynthesis, plants absorb carbon dioxide and produce oxygen.
Apart from that, decomposition of organisms and burning of fossil fuels also release carbon dioxide.
All these processes maintain the balance of oxygen and carbon dioxide in the atmosphere.
Explain the role of organisms in the carbon cycle and oxygen cycle.
Answer:
Plants and animals use oxygen and release carbon dioxide during respiration.
Through the process of photosynthesis, plants absorb carbon dioxide and produce oxygen.
Apart from that, decomposition of organisms and burning of fossil fuels also release carbon dioxide.
All these processes maintain the balance of oxygen and carbon dioxide in the atmosphere.
Question 4:
Suggest two steps to save water.
Answer:
(a) Collect rain water for everyday use such as watering plants or washing cars
(b) Ensure pipes are not leaking
(c) Wash cars using water in a pail
(Any other answers are accepted)
Suggest two steps to save water.
Answer:
(a) Collect rain water for everyday use such as watering plants or washing cars
(b) Ensure pipes are not leaking
(c) Wash cars using water in a pail
(Any other answers are accepted)