Photosynthesis: Practice Questions

A plant is placed in a dark cupboard for 48 hours before an experiment on photosynthesis. What is the main reason for this destarching process?

A student investigates the rate of photosynthesis using an aquatic plant submerged in a solution of sodium hydrogencarbonate. The student measures the rate of oxygen production at different temperatures. It is observed that the rate of photosynthesis increases as the temperature rises from \( 10^{\circ}C \) to \( 30^{\circ}C \), but then rapidly declines once the temperature exceeds \( 45^{\circ}C \). Which of the following best explains the decline in the rate of photosynthesis at high temperatures?

The chemical equation for photosynthesis is:
\( 6CO_{2} + 6H_{2}O → C_{6}H_{12}O_{6} + 6O_{2} \)
Which of the following identifies the role of the substance \( C_{6}H_{12}O_{6} \) and the conditions required for this reaction to occur in plants?

A student sets up an experiment to measure the rate of photosynthesis in an aquatic plant by measuring the volume of oxygen produced per unit time. The experiment is conducted at a constant temperature. If the student increases the concentration of carbon dioxide in the water while keeping the light intensity constant at a level that is initially the limiting factor, which of the following best describes the likely outcome?

A student investigates the rate of photosynthesis in an aquatic plant by measuring the volume of oxygen gas produced. The experiment is conducted under varying light intensities while maintaining a constant temperature and a high concentration of carbon dioxide. The student observes that at low light intensities, the rate of oxygen production increases linearly with light intensity. However, at very high light intensities, the rate of oxygen production plateaus and no longer increases. Which of the following statements best explains why the rate of photosynthesis plateaus at high light intensities?

In the process of photosynthesis, plants convert light energy into chemical energy. Name the two main products of this reaction.

In the context of Photosynthesis, why is chlorophyll essential for the process, and in which specific organelle is it found?

A student sets up an experiment with two identical plants in sealed jars. Jar A is provided with air containing normal carbon dioxide (\(CO_{2}\)), while Jar B is provided with air where the carbon dioxide contains the radioactive isotope carbon-14 (\(^{14}CO_{2}\)). Both jars are exposed to sunlight for 12 hours. After the experiment, the student extracts the sucrose from the leaves. In which jar will the sucrose be radioactive, and which specific stage of photosynthesis is responsible for incorporating the carbon into the sugar molecule?