Question 1: Define the term 'limiting factor' in the context of photosynthesis.

Answer: A limiting factor is a factor that restricts or slows down the rate of photosynthesis when it is in short supply or not optimal.

Question 2: Explain how light intensity can act as a limiting factor in photosynthesis.

Answer: Light intensity affects the rate of photosynthesis; if light is too weak, the rate decreases because less energy is available for the process.

Question 3: Describe what happens to the rate of photosynthesis when carbon dioxide levels are increased beyond a certain point.

Answer: Initially, increasing carbon dioxide increases the rate, but beyond a certain concentration, the rate levels off because another factor becomes limiting.

Question 4: How does temperature influence the rate of photosynthesis? Provide a brief explanation.

Answer: Temperature affects enzyme activity involved in photosynthesis; too low slows the process, too high can denature enzymes and inhibit the process.

Question 5: What is the primary limiting factor in a greenhouse where plants are not growing well despite sufficient light and water?

Answer: The primary limiting factor could be carbon dioxide concentration, temperature, or nutrient availability, depending on the specific conditions.

Question 1: A plant under optimal conditions produces 20 units of oxygen in 10 minutes. Calculate the rate of photosynthesis in units per minute.

Answer: Rate = Total oxygen units / Time = 20 units / 10 minutes = 2 units per minute.

Question 2: If increasing light intensity from 50 to 100 units doubles the rate of photosynthesis from 10 to 20 units per minute, what is the percentage increase in the rate?

Answer: Percentage increase = [(20 - 10) / 10] × 100 = 100%.

Question 1: Design a simple experiment to test how temperature affects the rate of photosynthesis. Include the variables you would control and measure.

Answer: The experiment involves placing identical plants in controlled environments at different temperatures (e.g., 10°C, 20°C, 30°C). Control variables include light intensity and carbon dioxide levels. Measure the rate of photosynthesis by counting oxygen bubbles produced per minute or measuring oxygen levels in water.

Question 2: A data scenario shows that at low light intensity, increasing CO2 concentration results in a higher rate of photosynthesis, but at high light intensity, the rate remains unchanged despite increased CO2. Explain this observation.

Answer: At low light, CO2 is a limiting factor, so increasing it boosts the rate. At high light, light is no longer limiting; thus, other factors like CO2 are already sufficient, and increasing it has no effect.

Question 1: How do farmers use the knowledge of limiting factors to improve crop yields in greenhouses?

Answer: Farmers control factors like light, temperature, and CO2 levels to optimize photosynthesis, thus increasing crop yields.

Question 2: Describe a technological advancement that helps enhance photosynthesis in crops by managing limiting factors.

Answer: Artificial lighting with adjustable intensity and spectrum, along with CO2 enrichment systems, help optimize conditions for photosynthesis in controlled agriculture.