Biology Grade 5 and 6: Photosynthesis

What is photosynthesis?

• The process by which animals convert sunlight into energy

• The process by which plants absorb water from the soil

• The process by which plants and animals exchange gases

• The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.

Name the two main products of photosynthesis.

• Chlorophyll and sunlight

• Glucose and oxygen

• Nitrogen and hydrogen

• Carbon dioxide and water

Which gas is used by plants during photosynthesis?

• Oxygen (O2)

• Carbon dioxide (CO2)

• Nitrogen (N2)

• Methane (CH4)

What are the two main stages of photosynthesis?

• Respiration and Transpiration

• Dark reaction and Krebs cycle

• Light reaction and Calvin cycle

• Water cycle and Nitrogen cycle

Where does photosynthesis take place in a plant cell?

• Mitochondria

• Vacuole

• Cell membrane

• Chloroplasts

What is the role of chlorophyll in photosynthesis?

• Producing oxygen

• Storing glucose

• Absorbing light energy

• Releasing carbon dioxide

What is the equation for photosynthesis?

• 2CO2 + 2H2O + light energy → C3H6O3 + 2O2

• 4CO2 + 4H2O + light energy → C4H8O4 + 4O2

• 6CO2 + 6H2O + light energy → C6H12O6 + 6O2

• 8CO2 + 8H2O + light energy → C8H16O8 + 8O2

How does light intensity affect the rate of photosynthesis?

• It provides the energy needed for the process to occur.

• It decreases the rate of photosynthesis

• It has no effect on the rate of photosynthesis

• It causes the plants to stop photosynthesizing

What are the environmental factors that can affect photosynthesis?

• Wind speed, humidity, and soil pH

• Cloud cover, altitude, and magnetic field strength

• Light intensity, temperature, water, and carbon dioxide

• Noise pollution, air pollution, and deforestation

Explain the process of photosynthesis in detail.

• Plants use sunlight, carbon dioxide, and water to produce nitrogen and glucose.

• Plants use sunlight, carbon dioxide, and water to produce glucose and oxygen.

• Plants use moonlight, carbon dioxide, and water to produce glucose and oxygen.

• Plants use sunlight, nitrogen, and water to produce carbon dioxide and oxygen.