Grade 8 Cells & Life Processes worksheet
from Gradelings · Name: ______________________
How to explain it
- Cell theory: all living things are made of cells, and cells come from other cells.
- Chloroplasts do photosynthesis; mitochondria do respiration. The products of one are the inputs of the other.
- Osmosis is water moving across a membrane. Cells form tissues, organs and systems.
Example: What are the products of photosynthesis? Plants use light, water and carbon dioxide. They make sugar and give off a gas. Answer: glucose and oxygen
Question 1
What is the basic unit of life?
- the organ
- the cell
- the atom
- the tissue
the cell
Hint: All living things are made of one or more cells.
Question 2
Osmosis is the movement of…
- glucose out of the nucleus
- light into a leaf
- water across a membrane
- DNA into a cell
water across a membrane
Hint: Water moves through a semi-permeable membrane, usually toward higher solute concentration.
Question 3
Found only in plant cells, or in both plant and animal cells? Sort each cell part.
Sort into: 🌿 Plant cells only · 🐾 Plant and animal cells
- 🟢chloroplasts
- 🔋mitochondria
- 🥣cytoplasm
- 🧱cell wall
- ⚙️ribosomes
- 💧large central vacuole
- 🫧cell membrane
🌿 Plant cells only: chloroplasts, cell wall, large central vacuole · 🐾 Plant and animal cells: mitochondria, cytoplasm, ribosomes, cell membrane
Hint: Chloroplasts, the cell wall and the large central vacuole are only in plant cells. The nucleus, mitochondria, cell membrane, cytoplasm and ribosomes are in both.
Question 4
What are the products of photosynthesis?
- carbon dioxide and oxygen
- carbon dioxide and water
- glucose (sugar) and oxygen
- water and energy
glucose (sugar) and oxygen
Hint: Glucose stores energy for the plant, and oxygen is released.
Question 5
Where does photosynthesis happen in a plant cell?
- ribosomes
- chloroplasts
- nucleus
- mitochondria
chloroplasts
Hint: Chloroplasts contain chlorophyll, which captures light energy.
Question 6
How are photosynthesis and cellular respiration related?
- They happen only at night.
- They are the same process.
- The products of one are the inputs of the other.
- They happen only in animals.
The products of one are the inputs of the other.
Hint: Photosynthesis makes glucose and oxygen. Respiration uses glucose and oxygen.
Question 7
What are the inputs of photosynthesis?
- oxygen and sugar
- oxygen and water
- carbon dioxide, water and light energy
- sugar and light
carbon dioxide, water and light energy
Hint: Plants use CO₂, water and light to make glucose (sugar) and oxygen.
Question 8
What are the products of cellular respiration?
- only sugar
- glucose and oxygen
- only oxygen
- energy, carbon dioxide and water
energy, carbon dioxide and water
Hint: Cells use glucose and oxygen to release energy, making carbon dioxide and water.
Question 9
Which of these is part of the cell theory?
- All living things are made of cells.
- All cells are the same size.
- Cells only exist in animals.
- Cells appear from non-living matter.
All living things are made of cells.
Hint: The cell theory: living things are made of cells, cells are the basic unit of life, and all cells come from existing cells.
Question 10
Which structure is found in plant cells but NOT animal cells?
- mitochondria
- cell wall
- nucleus
- cell membrane
cell wall
Hint: Plant cells have a rigid cell wall outside the membrane, plus chloroplasts.
Answer key
- 1. the cell
- 2. water across a membrane
- 3. 🌿 Plant cells only: chloroplasts, cell wall, large central vacuole · 🐾 Plant and animal cells: mitochondria, cytoplasm, ribosomes, cell membrane
- 4. glucose (sugar) and oxygen
- 5. chloroplasts
- 6. The products of one are the inputs of the other.
- 7. carbon dioxide, water and light energy
- 8. energy, carbon dioxide and water
- 9. All living things are made of cells.
- 10. cell wall
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