Question

biology regents review - cellular respiration and photosynthesis assessment

1. a green plant is kept in a brightly lighted area for 48 hours. what will most likely occur if the light intensity is then reduced slightly during the next 48 hours?

a. photosynthesis will stop completely.
b. the rate at which nitrogen is used by the plant will increase.
c. the rate at which oxygen is released from the plant will decrease.
d. glucose production inside each plant cell will increase.

1. an inorganic molecule required by green plants for the process of photosynthesis is

a. oxygen
b. starch
c. carbon dioxide
d. glucose

1. if the leaves of a geranium plant receive an adequate supply of raw materials, which graph below shows how the rate of photosynthesis is related to increasing light intensity received by the plant?

Explanation:

1. Photosynthesis is light - dependent. A slight reduction in light intensity will slow down the rate of photosynthesis. Oxygen is a by - product of photosynthesis, so its release rate will decrease. Also, glucose production, which is a main product of photosynthesis, will decrease. Nitrogen use is not directly related to light - intensity changes in this context.
2. The raw inorganic materials for photosynthesis are carbon dioxide and water. Oxygen is a product, and starch and glucose are organic molecules produced during photosynthesis.
3. As light intensity increases (when raw materials are adequate), the rate of photosynthesis increases up to a certain point (due to other limiting factors like enzyme availability etc.), which is shown by a curve that initially rises.

Answer:

1. C. The rate at which oxygen is released from the plant will decrease.
2. C. carbon dioxide
3. (3)