Photosynthesis and Cellular Respiration Review (DFA)

Identify whether the molecules below are reactants or products of the process that transforms light energy into chemical energy (Photosynthesis).

Groups:

(a) Reactants

,

(b) Products

• Oxygen

• Carbon Dioxide

• Glucose

• Water

Answer explanation

Photosynthesis is the process plants use to turn light energy into chemical energy. In this process:

• Carbon dioxide (CO₂) from the air and water (H₂O) from the soil go into the chloroplast. These are the reactants.

• Using sunlight, the plant rearranges those molecules to make glucose (C₆H₁₂O₆), which stores energy, and releases oxygen (O₂) as a byproduct. These are the products.

Tags

NGSS.HS-LS1-5

What reaction is taking place between A and C on the diagram?

• Photosynthesis

• Ammonification

• Cellular Respiration

• Glycolysis

Answer explanation

The reaction between A and C is photosynthesis, where plants convert carbon dioxide and water into glucose and oxygen using sunlight. This process is essential for energy production in plants.

Tags

NGSS.HS-LS1-7

In an experiment of photosynthesis on an aquatic plant, what is the name of the gas that is being produced?

• Carbon dioxide

• Hydrogen

• Oxygen

• Water

Answer explanation

During photosynthesis, aquatic plants take in carbon dioxide and release oxygen as a byproduct. Therefore, the gas produced in this process is oxygen.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Identify whether the molecules below are reactants or products of the process that transforms chemical energy (food) into chemical energy (ATP) (Cellular Respiration).

Groups:

(a) Reactants

,

(b) Products

• Glucose

• Water

• Oxygen

• Carbon Dioxide

Answer explanation

Cellular respiration is how cells release energy from food. In this process:

• Cells take in glucose (from food) and oxygen (from breathing). These are the reactants.

• The glucose is broken down, and with oxygen’s help, it produces ATP (the usable energy for the cell). Along the way, carbon dioxide (CO₂) and water (H₂O) are created as products and released as waste.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS1-6

Cellular respiration results in the production of ATP for energy. Which of the following are also produced during cellular respiration?

• water

• oxygen

• glucose

• glycogen

• carbon dioxide

Answer explanation

During cellular respiration, cells break down glucose in the presence of oxygen to make ATP (energy). In the process:

• Water (H₂O) and Carbon dioxide (CO₂) are created as byproducts.

• Oxygen is actually a reactant (needed at the start), not a product.

• Glucose is the fuel that gets broken down, not something made.

• Glycogen is the storage form of glucose in animals, but it’s not produced during respiration.

Tags

NGSS.HS-LS1-7

A student places a plant inside a sealed aquarium that weighs 1,200 grams in total. The aquarium is kept in sunlight, and after a week, the student notices the plant has noticeably grown. The student weighs the aquarium again.

Which prediction best explains what the student should observe about the mass of the aquarium?

• The mass will decrease because the plant used carbon dioxide from the air inside the terrarium.

• The mass will increase because the plant produced oxygen while it grew.

• The mass will stay the same because the plant used carbon dioxide but produced oxygen.

• The mass cannot be predicted because there is too little information.

Answer explanation

The mass will increase because the plant produces oxygen during photosynthesis, which adds to the total mass in the sealed aquarium, despite using carbon dioxide.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

NGSS.MS-LS1-5

What is wrong with this model of photosynthesis?

• The roots are visible.

• It shows carbon dioxide as a reactant of photosynthesis.

• It does not show glucose as a product of photosynthesis.

• It shows oxygen as a product of photosynthesis.

Answer explanation

The model is incorrect because it fails to show glucose, a key product of photosynthesis. While it correctly includes carbon dioxide and oxygen, omitting glucose misrepresents the overall process.

Tags

NGSS.HS-LS1-5

When running long distances, there are different steps that allow you to run.

Step 1: You eat food before running.

Step 2: The food you eat is broken down into nutrients.

Step 3: Usable energy is produced from the nutrients.

Step 4: Your muscles use the energy to contract.

Which of the following could make the steps more accurate. Select two statements to make the list more accurate.

• Step 1: You completely digest food while chewing

• Step 2: The food molecules broken down into nutrients are fat and carbohydrate molecules.

• Step 3: Usable energy is produced from the nutrients during cellular respiration.

• Step 4: Your muscles produce glucose when they use energy to contract.

Answer explanation

Step 2 is accurate as it specifies that nutrients include fat and carbohydrates, which are key energy sources. Step 3 is also correct because it clarifies that energy is produced during cellular respiration, a vital process for muscle contraction.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Students set up an experiment. They were asked to set up 4 tanks. The tanks were set up like this:

Tank 1 = 1 plant

Tank 2 = 2 fish

Tank 3 = 1 plant and 2 fish

Tank 4 = nothing

If the tanks were left sealed, which one would most likely end up with the largest amount of CO2? ​ (a)  

Which of these options would help to reduce the amount of CO2 produced?​ (b)  

• Flask 2
• Flask 1
• Flask 3
• Flask 4
• Add a plant to the tank
• Add a fish to the tank
• remove a plant from the tank
• do nothing because the CO2 will naturally go away

Answer explanation

Fish only do cellular respiration producing CO2 and using Oxygen. No photosynthesis is present to balance it. Flask 2 will have the most CO2. Adding a plant to the tank will reduce CO2 since the plant would consume CO2 during photosynthesis.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-5

NGSS.HS-ESS2-6

What is the primary molecule that provides energy for cellular processes?

• ATP

• DNA

• phosphate

• oxygen

Answer explanation

ATP (adenosine triphosphate) is the primary energy carrier in cells, providing the necessary energy for various cellular processes. DNA stores genetic information, while phosphate and oxygen play different roles in metabolism.

Tags

NGSS.HS-LS1-7