📄 7th Grade Life Science: Photosynthesis Worksheet
📌 1. True / False
1. Photosynthesis is the process by which plants make their own food.
2. Plants absorb oxygen from the air for photosynthesis.
3. Chlorophyll is the green pigment found in plant cells.
4. Photosynthesis can occur without sunlight.
5. Water is a necessary reactant for photosynthesis.
✏️ 2. Fill in the Blanks
1. Plants use from the air and water from the soil to perform photosynthesis.
2. The energy for photosynthesis comes from .
3. The main product of photosynthesis that plants use for food is .
4. are the organelles in plant cells where photosynthesis takes place.
5. Photosynthesis releases as a byproduct into the atmosphere.
🔗 3. Matching
« The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
« The green pigment present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
« An organelle found in plant and algae cells where photosynthesis occurs.
« A simple sugar that is an important energy source in living organisms and is a product of photosynthesis.
« Tiny pores on the surface of leaves through which gases like carbon dioxide and oxygen enter and exit.
✍️ 4. Short Answer Questions
1. Name two essential ingredients (reactants) that plants need for photosynthesis.
💡 Suggested Answer: Carbon dioxide and water.
2. What is the primary role of sunlight in the process of photosynthesis?
💡 Suggested Answer: Sunlight provides the energy needed to convert carbon dioxide and water into glucose and oxygen.
🎯 5. Multiple Choice
1. Which gas do plants take in from the atmosphere for photosynthesis?
2. Where does photosynthesis primarily occur in a plant cell?
3. What is the main type of sugar produced by photosynthesis?
📝 6. Open-Ended Questions
1. Explain the basic equation for photosynthesis, identifying the reactants and products.
💡 Solution Steps:
The basic equation for photosynthesis is: Carbon Dioxide + Water + Sunlight Energy \(\rightarrow\) Glucose + Oxygen.
* Reactants: Carbon Dioxide and Water are the substances that plants take in from their environment. Sunlight provides the energy for the reaction.
* Products: Glucose (a sugar) is the food that the plant makes for itself, and Oxygen is released as a byproduct into the atmosphere.
2. Describe the importance of photosynthesis for all living things on Earth.
💡 Solution Steps:
Photosynthesis is crucial for life on Earth for two main reasons:
* Food Production: It produces glucose, which is the primary source of energy for plants. Animals then consume plants (or other animals that eat plants) to obtain this energy, forming the base of most food chains.
* Oxygen Production: Photosynthesis releases oxygen into the atmosphere. This oxygen is essential for the respiration of most living organisms, including humans and animals. Without photosynthesis, the oxygen levels would deplete, making life as we know it impossible.
3. Imagine a plant is placed in a dark room. What would happen to its ability to perform photosynthesis and why?
💡 Solution Steps:
If a plant is placed in a dark room, its ability to perform photosynthesis would stop or be severely limited.
* Reason: Photosynthesis requires sunlight as its primary energy source. Without sunlight, the plant cannot convert carbon dioxide and water into glucose (food) and oxygen.
* Consequence: Over time, the plant would deplete its stored energy reserves, cease to grow, and eventually die because it cannot produce the food it needs to survive.
Name Surname: .................................. Date: .... / .... / 202...
Photosynthesis Worksheet
SCORE
A. True (T) / False (F)
( .... )
Photosynthesis is the process by which plants make their own food.
( .... )
Plants absorb oxygen from the air for photosynthesis.
( .... )
Chlorophyll is the green pigment found in plant cells.
( .... )
Photosynthesis can occur without sunlight.
( .... )
Water is a necessary reactant for photosynthesis.
B. Fill in the Blanks
1)
Plants use .................... from the air and water from the soil to perform photosynthesis.
2)
The energy for photosynthesis comes from .....................
3)
The main product of photosynthesis that plants use for food is .....................
4)
.................... are the organelles in plant cells where photosynthesis takes place.
5)
Photosynthesis releases .................... as a byproduct into the atmosphere.
C. Matching Concepts
( .... )
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
- Chloroplast
( .... )
The green pigment present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
- Photosynthesis
( .... )
An organelle found in plant and algae cells where photosynthesis occurs.
- Chlorophyll
( .... )
A simple sugar that is an important energy source in living organisms and is a product of photosynthesis.
- Stomata
( .... )
Tiny pores on the surface of leaves through which gases like carbon dioxide and oxygen enter and exit.
- Glucose
D. Short Answer Questions
1)
Name two essential ingredients (reactants) that plants need for photosynthesis.
2)
What is the primary role of sunlight in the process of photosynthesis?
E. Multiple Choice Questions
1)
Which gas do plants take in from the atmosphere for photosynthesis?
A) OxygenB) Carbon DioxideC) NitrogenD) Hydrogen
2)
Where does photosynthesis primarily occur in a plant cell?
A) NucleusB) MitochondriaC) ChloroplastD) Vacuole
3)
What is the main type of sugar produced by photosynthesis?
A) FructoseB) LactoseC) GlucoseD) Sucrose
F. Open-Ended Questions
1)
Explain the basic equation for photosynthesis, identifying the reactants and products.
2)
Describe the importance of photosynthesis for all living things on Earth.
3)
Imagine a plant is placed in a dark room. What would happen to its ability to perform photosynthesis and why?