Question 1: Define the term 'photosynthesis'.

Answer: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose molecules.

Question 2: List the main reactants and products of the photosynthesis reaction.

Answer: Reactants: Carbon dioxide and water; Products: Glucose and oxygen.

Question 3: Explain the role of sunlight in the photosynthesis process.

Answer: Sunlight provides the energy required to drive the chemical reactions involved in converting carbon dioxide and water into glucose and oxygen.

Question 1: If a plant absorbs 10,000 lux of light and produces 2 grams of glucose in one hour, what is the rate of glucose production per 1000 lux?

Answer: Rate = (2 grams / 10,000 lux) × 1000 lux = 0.2 grams per 1000 lux

Question 2: Using the photosynthesis equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂, how many molecules of oxygen are produced from 12 molecules of carbon dioxide?

Answer: 12 molecules of CO₂ produce 12 molecules of O₂.

Question 1: Describe a simple experiment to test the effect of light intensity on the rate of photosynthesis.

Answer: Place a healthy plant in a controlled environment. Vary the distance between a light source and the plant to change light intensity. Measure the rate of oxygen production or starch formation at different distances to determine how light intensity affects photosynthesis.

Question 2: Identify two variables that should be kept constant in this experiment and explain why.

Answer: Variables such as temperature and carbon dioxide concentration should be kept constant to ensure that any change in the rate of photosynthesis is due solely to changes in light intensity.

Question 3: List three safety precautions to consider when conducting experiments related to photosynthesis.

Answer: Use safety goggles to protect eyes, handle chemicals carefully, and ensure proper ventilation when working with light sources and chemicals.

Question 1: A scientist measures the amount of oxygen produced by a plant under different light intensities. At low light, oxygen production is 1 mg/hour; at medium light, 3 mg/hour; and at high light, 4.5 mg/hour. Describe the trend and suggest possible reasons for this pattern.

Answer: Oxygen production increases with light intensity but at a decreasing rate, indicating a saturation point. This suggests that at higher light levels, other factors such as enzyme activity or CO₂ availability may limit the rate of photosynthesis.

Question 1: Explain the importance of the reaction involved in photosynthesis for life on Earth. Include details about the reactants, products, and the significance of this process in maintaining ecological balance.

Answer: Photosynthesis is vital because it produces glucose, which serves as an energy source for plants and animals. It also releases oxygen into the atmosphere, which is essential for respiration. The process helps remove carbon dioxide from the atmosphere, balancing the Earth's carbon levels and supporting life globally.

Question 1: Describe how knowledge of the photosynthesis reaction has contributed to advancements in agriculture or renewable energy technology.

Answer: Understanding photosynthesis has led to the development of greenhouse technology to optimize crop yields and the creation of biofuels that mimic plant energy conversion, promoting sustainable energy sources.