Cycling Matter Through Organisms & Environment — Drills · Grade 6 Science
Chapter: Ecosystems, Watersheds & ConservationWhat these drills covers
By the end of Cycling Matter Through Organisms & Environment you should be able to:
- I can trace a carbon atom through at least four stages of the carbon cycle.
- I can explain why nitrogen is scarce for plants when the air is 78 per cent nitrogen.
- I can describe how human activity has changed the carbon and nitrogen cycles.
4 questions, multiple choice and written answer, each with a worked explanation.
Vocabulary used: decomposition, respiration, evidence, system boundary, uncertainty.
Problem 1
- decomposition: Biological breakdown and transformation of organic material into other matter stores and forms.
- Decomposers make matter disappear.
- Recycling matter automatically recycles all usable energy.
- A sample with missing measurements has proved those values are zero.
Answer and explanation
decomposition: Biological breakdown and transformation of organic material into other matter stores and forms.
Biological breakdown and transformation of organic material into other matter stores and forms.
Problem 2
- Recycling matter automatically recycles all usable energy.
- respiration: Cellular processes releasing usable energy from organic material, with associated matter changes.
- Decomposers make matter disappear.
- Repeating any method makes every causal claim true.
Answer and explanation
respiration: Cellular processes releasing usable energy from organic material, with associated matter changes.
Cellular processes releasing usable energy from organic material, with associated matter changes.
Problem 3
Answer and explanation
Some material enters those organisms rather than all immediately becoming soil; the account needs actual pathways.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
Specified matter or nutrient units, not the complete original usable energy supply.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.