Carbon, Water & Cycling Matter — Drills · Grade 7 Science
Chapter: Ecosystems, Matter & EnergyWhat these drills covers
By the end of Carbon, Water & Cycling Matter you should be able to:
- I can explain carbon, water & cycling matter.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: reservoir, transpiration, condensation, runoff, storage change.
Problem 1
Which contributes carbon matter to photosynthetic sugar production?
- Carbon dioxide
- The color of sunlight
- Only a thermometer
- A graph title
Answer and explanation
Carbon dioxide
Carbon dioxide supplies carbon atoms; light provides energy.
Problem 2
A water store receives 30 L and loses 18 L in one stated interval. Find storage change.
Answer and explanation
12 L
30−18=+12 L under the stated complete budget.
Problem 3
Does sunlight supply the carbon atoms in sugar?
Answer and explanation
No. Carbon dioxide supplies carbon matter in the plant model; light supplies energy.
Problem 4
Does evaporation destroy water molecules in this model?
Answer and explanation
No. It changes state and location while the water remains matter in the larger system.