Photosynthesis & Cellular Respiration — Drills · Grade 7 Science
Chapter: Cells, Transport & Cellular EnergyWhat these drills covers
By the end of Photosynthesis & Cellular Respiration you should be able to:
- I can explain photosynthesis & cellular respiration.
- 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: photosynthesis, cellular respiration, reactant, product, net change.
Problem 1
Which organism can both photosynthesize and respire?
- A typical green plant
- Only an animal
- A rock
- A scale bar
Answer and explanation
A typical green plant
Green plants can perform both; the processes have different roles.
Problem 2
A gas reading changes from 300 to 260 units. Find the signed change.
Answer and explanation
-40 units
Final minus initial: 260−300=−40 units.
Problem 3
Where does much of a growing plant’s carbon come from?
Answer and explanation
Carbon dioxide taken from the surroundings supplies carbon used in organic molecules; light supplies energy rather than carbon matter.
Problem 4
Does falling carbon dioxide around a lit plant prove it stopped respiring?
Answer and explanation
No. Photosynthetic uptake can exceed respiration while both continue; the measurement is a net change.