Photosynthesis & Cellular Respiration

The organelle that breaks down sugar molecules into energy.

• nucleus

• mitochondria

• cell membrane

• chloroplast

Photosynthesis is a process that makes ________.

• energy from food

• space to live

• life easier

• energy from light

Answer explanation

Photosynthesis is a process powered by sunlight that uses carbon dioxide and water to produce oxygen and food.

Which substance is needed to start photosynthesis?

• nitrogen

• carbon dioxide

• oxygen

• glucose

What substance is produced from photosynthesis?

• nitrogen

• carbon dioxide

• water

• glucose

What is cellular respiration?

• transporting material

• talking with someone on a cell phone

• breaking food down to get the energy

• storing energy as a lipid

What is a major source of energy for cellular respiration?

• DNA

• Water

• the cell membrane

• glucose

Answer explanation

Glucose is a simple sugar from a broken down carbohydrate molecule.

What is the source of energy for all living organisms on Earth?

• plants

• the Sun

• the Moon

• algae

The first stage of photosynthesis is using energy to produce sugars.

• TRUE

• FALSE

Answer explanation

Sugar (glucose) is produced in the second stage after sunlight's energy is captured in the first stage.

What substance is needed to carry out respiration?

• oxygen

• carbon dioxide

• nitrogen

• carbon

Answer explanation

Oxygen is needed to carry out respiration in majority of living cells.

What are all the products of cellular respiration?

• carbon dioxide

• carbon dioxide and water

• carbon dioxide, water & energy

• carbon dioxide, water, energy & glucose