Photosynthesis and Respiration Concepts

This video covers key concepts in GCSE biology, focusing on photosynthesis and respiration. It explains the word and symbol equations for photosynthesis, discusses limiting factors, and provides a practical guide for experiments. The video also covers the inverse square law, greenhouse conditions, and the processes of aerobic and anaerobic respiration, highlighting their importance in metabolism.

What is the correct word equation for photosynthesis?

• Carbon Dioxide + Water → Glucose + Oxygen

• Oxygen + Glucose → Water + Carbon Dioxide

• Glucose + Oxygen → Carbon Dioxide + Water

• Water + Carbon Dioxide → Oxygen + Glucose

What is the role of chlorophyll in photosynthesis?

• Absorbs light energy

• Releases oxygen

• Absorbs carbon dioxide

• Converts glucose to starch

Which factor is NOT a limiting factor in photosynthesis?

• Light intensity

• Carbon dioxide concentration

• Chlorophyll concentration

• Soil pH

What happens to enzymes in photosynthesis when the temperature is too high?

• They stop absorbing light

• They are converted to glucose

• They denature

• They become more active

In a photosynthesis experiment, why is it important to control the temperature?

• To keep the plant hydrated

• To avoid temperature being a limiting factor

• To prevent the water from evaporating

• To ensure the plant receives enough light

What does the inverse square law describe in the context of photosynthesis?

• The relationship between light intensity and distance

• The absorption of light by chlorophyll

• The effect of temperature on enzyme activity

• The rate of photosynthesis at different CO2 levels

Why is it beneficial for farmers to use dry ice machines in greenhouses?

• To increase carbon dioxide levels

• To maintain a constant temperature

• To increase light intensity

• To reduce humidity

What is the main product of aerobic respiration?

• Lactic acid

• Ethanol

• Carbon dioxide and water

• Glucose

Which of the following is a characteristic of anaerobic respiration in muscle cells?

• Requires oxygen

• Releases more energy than aerobic respiration

• Produces lactic acid

• Produces ethanol

What is the primary purpose of aerobic respiration during exercise?

• To store glucose

• To release energy

• To increase heart rate

• To produce lactic acid