Question

1. leaves of green plants contain openings known as stomates, which are opened and closed by specialized cells allowing for gas exchange between the leaf and the outside environment. which phrase best represents the net flow of gases involved in photosynthesis into and out of the leaf through these openings on a sunny day? a. carbon dioxide moves in; oxygen moves out b. carbon dioxide and oxygen move in; ozone moves out c. oxygen moves in; nitrogen moves out d. water and ozone move in; carbon dioxide moves out 19. the graph below shows the results of an experiment in which a container of oxygen - using bacteria and strands of a green alga were exposed to light of different colors. graph showing relationship between color of light (red, green, violet) and number of oxygen - using bacteria which statement best explains the results of this experiment? a. the rate of photosynthesis is affected by variations in the light. b. in all environments light is a vital resource. c. the activities of bacteria and algae are not related. d. uneven numbers and types of species can upset ecosystem stability.

Explanation:

For question 18, during photosynthesis on a sunny day, green plants take in carbon - dioxide for the process and release oxygen as a by - product through the stomata. For question 19, the graph shows the number of oxygen - using bacteria changes with different colors of light, indicating that the rate of photosynthesis (which affects oxygen production and thus the presence of oxygen - using bacteria) is affected by light variations.

Answer:

1. A. carbon dioxide moves in; oxygen moves out
2. A. The rate of photosynthesis is affected by variations in the light.