How photosynthesis and respiration feed each other
Grade 9 Science Worksheet - Building Confidence
Circle the best answer.
Read this first
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Flow diagram drawn as a loop (model, not to scale), inside a leaf cell. Two process boxes: photosynthesis, in the chloroplast, on the left; cellular respiration, in the mitochondrion, on the right. An arrow from photosynthesis to cellular respiration carries: glucose; oxygen. The arrow from cellular respiration back to photosynthesis is blank. A wavy arrow points into photosynthesis: light energy. A wavy arrow points out of cellular respiration: energy moved to ATP and heat.
Ari reads a loop diagram of a leaf cell. The arrow from cellular respiration back to photosynthesis is blank. Which substances belong on it?
- Glucose and oxygen
- Carbon dioxide and water
- Light energy and heat
- Nothing, since the processes share no substances
Use this
Flow diagram drawn as a loop (model, not to scale), inside a leaf cell. Two process boxes: photosynthesis, in the chloroplast, on the left; cellular respiration, in the mitochondrion, on the right. An arrow from photosynthesis to cellular respiration carries: glucose; oxygen. An arrow from cellular respiration back to photosynthesis carries: carbon dioxide; water. A wavy arrow points into photosynthesis: light energy. A wavy arrow points out of cellular respiration: energy moved to ATP and heat.
Bo reads that photosynthesis hands glucose and oxygen to cellular respiration. What does cellular respiration do with them?
- Uses them as its starting substances
- Ignores them and runs on its own supply
- Turns them into light energy for the leaf
- Makes them again from carbon dioxide and water
Esme counts the arrows that carry matter between the two boxes. How many are there, and which way do they point?
- Two, both from respiration to photosynthesis
- Two, one pointing each way
- Zero, since the boxes pass no substances
- One, from photosynthesis to respiration
Jun reads a leaf cell with two organelles, A and B. Which pair of names fits A and B?
- A is the nucleus and B is the cell wall
- A is a chloroplast and B is a mitochondrion
- A is a chloroplast, and the cell has no organelle B
- A is a mitochondrion and B is a chloroplast
Four cells are drawn (not to scale). Kira compares four cells. Which one has both chloroplasts and mitochondria?
- No cell, since a cell makes sugar or uses it, not both
- Cell B, from the muscle of a person
- Cell A, from the green leaf
- Cell C, from the yeast in bread dough
Milo reads a word list. Which meaning matches the term photoautotroph?
- An organism that uses light to make its own food
- An organism that must take in sugars made by others
- An organism that does photosynthesis but not respiration
- An organism that gets energy from chemicals, not light
Pia reads that, in the loop, oxygen from photosynthesis is called a byproduct. What does that word mean here?
- A substance made by animals, not by plants
- A substance the cell absorbs straight from light
- A leftover that no cell can use
- A substance one reaction releases that another can use
“model, not to scale” Ren reads the wavy arrow that points into photosynthesis. Its label is blank. What does it carry?
- Heat energy from respiration
- Light energy
- Energy taken from the soil
- Chemical energy from glucose
Use this
Flow diagram drawn as a loop (model, not to scale), inside a leaf cell. Two process boxes: photosynthesis, in the chloroplast, on the left; cellular respiration, in the mitochondrion, on the right. An arrow from photosynthesis to cellular respiration carries: glucose; oxygen. An arrow from cellular respiration back to photosynthesis carries: carbon dioxide; water. A wavy arrow points into photosynthesis: light energy. A wavy arrow points out of cellular respiration. Its label is blank.
Tala reads the wavy arrow that points out of cellular respiration. Its label is blank. What does it carry?
- Light energy sent back to photosynthesis
- Energy released at night and paused by day
- New energy created by the cell
- Energy moved to ATP, plus heat
Use this
Flow diagram drawn as a loop (model, not to scale), inside a leaf cell. Two process boxes: photosynthesis, in the chloroplast, on the left; cellular respiration, in the mitochondrion, on the right. An arrow from photosynthesis to cellular respiration carries: glucose; oxygen. An arrow from cellular respiration back to photosynthesis carries: carbon dioxide; water. A wavy arrow points into photosynthesis: light energy. A wavy arrow points out of cellular respiration: energy moved to ATP and heat.
Zee reads the whole loop. Which statement about energy in the loop is right?
- Energy enters as light and some leaves as heat
- Energy is made fresh by the leaf cell
- Energy enters as heat and leaves as light
- Energy goes round and round like the matter does