Photosynthesis Review

Most plants appear green because chlorophyll

• absorbs green light.

• absorbs violet light.

• reflects green light.

• does not absorb violet light.

Answer explanation

Most plants appear green because chlorophyll reflects green light, rather than absorbing it. This reflection is why we perceive plants as green, while chlorophyll absorbs other wavelengths, particularly in the blue and red regions.

Tags

NGSS.MS-LS1-6

The reactants of photosynthesis are

• sugar and water.

• sugar and oxygen.

• carbon dioxide and water.

• carbon dioxide and oxygen.

Answer explanation

The reactants of photosynthesis are carbon dioxide and water. During the process, plants use sunlight to convert these substances into glucose and oxygen, making the correct answer carbon dioxide and water.

Tags

NGSS.MS-LS1-6

What are the products of photosynthesis?

• Carbon dioxide and water

• Carbon dioxide and oxygen

• Glucose and oxygen

• Glucose and water

Answer explanation

The products of photosynthesis are glucose and oxygen. During this process, plants convert carbon dioxide and water into glucose for energy and release oxygen as a byproduct.

Tags

NGSS.MS-LS1-6

What pigment absorbs sunlight for photosynthesis?

• chloroplast

• thylakoid

• grana

• chlorophyll

Answer explanation

Chlorophyll is the pigment in plants that absorbs sunlight, enabling photosynthesis. It captures light energy, which is essential for converting carbon dioxide and water into glucose and oxygen.

Tags

NGSS.MS-LS1-6

Which of the following is the correct equation for PHOTOSYNTHESIS?

• 6CO₂ + 6H₂O --> 6O₂ + C₆H₁₂O₆

• 6CO₂ + C₆H₁₂O₆ + 6H₂O --> O₂ 

• 6O₂ + 6H₂O --> 6CO₂ + C₆H₁₂O₆

• C₆H₁₂O₆ + 6O₂ ---> 6H₂O + 6CO₂ 

Answer explanation

The correct equation for photosynthesis is 6CO2 + 6H2O -> 6O2 + C6H12O6, which shows that carbon dioxide and water are converted into glucose and oxygen using sunlight.

Tags

NGSS.MS-LS1-6

Which gas is removed from the atmosphere during photosynthesis?

• hydrogen

• oxygen

• nitrogen

• carbon dioxide

Answer explanation

During photosynthesis, plants absorb carbon dioxide from the atmosphere and convert it into glucose and oxygen. Therefore, the gas removed from the atmosphere is carbon dioxide.

Tags

NGSS.MS-LS1-6

What is the function of NADPH and ATP?

• They absorb light

• They power the light-dependent reactions

• They are light-reflecting pigments

• They are short term energy carriers

Answer explanation

NADPH and ATP are crucial as short-term energy carriers in cellular processes. They store and transfer energy needed for various biochemical reactions, particularly in photosynthesis and cellular respiration.

Tags

NGSS.HS-LS1-5

Where do the light-dependent reactions occur? 

• thylakoid membrane

• stroma

• mesophyll

• mitochondria

Answer explanation

The light-dependent reactions of photosynthesis occur in the thylakoid membrane of chloroplasts, where sunlight is captured and converted into chemical energy.

Tags

NGSS.MS-LS1-6

Which of the following is NOT a product of the light-dependent reactions?

• ATP

• NADPH

• Oxygen

• Glucose

Answer explanation

Glucose is not produced in the light-dependent reactions; instead, ATP, NADPH, and oxygen are the main products. Glucose is synthesized later during the Calvin cycle, which is part of the light-independent reactions.

Tags

NGSS.MS-LS1-6

What is the primary function of the light-dependent reactions of photosynthesis?

• To produce glucose

• To produce NADPH and ATP

• To use ATP

• To produce RuBP

Answer explanation

The primary function of the light-dependent reactions is to convert light energy into chemical energy, producing NADPH and ATP, which are essential for the subsequent light-independent reactions that synthesize glucose.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3