Answer the following question given this paragraph: To allow the plant to retain water and exchange gases, small pores (holes) in the leaves called stomata also evolved ( Figure below ). The stomata can open and close depending on weather conditions. When it's hot and dry, the stomata close to keep water inside of the plant. When the weather cools down, the stomata can open again to let carbon dioxide in and oxygen out. Q: What is the name for the pores in leaves that allow a plant to retain water or exchange gases? Choices: - neurons - chloroplasts - rhizomes - stomata A:
stomata
Answer the following question given this paragraph: Q: The toothlessness of modern birds, which serves to trim the weight of the head, is an example of what? Choices: - mutation - genetic drift - variety - adaptation A:
adaptation
Q: Answer the following question given this paragraph: The replacing of the electron enables chlorophyll to respond to another photon. The oxygen molecules produced as byproducts find their way to the surrounding environment. The hydrogen ions play critical roles in the remainder of the light-dependent reactions. Keep in mind that the purpose of the light-dependent reactions is to convert solar energy into chemical carriers that will be used in the Calvin cycle. In eukaryotes and some prokaryotes, two photosystems exist. The first is called photosystem II, which was named for the order of its discovery rather than for the order of the function. After the photon hits, photosystem II transfers the free electron to the first in a series of proteins inside the thylakoid membrane called the electron transport chain. As the electron passes along these proteins, energy from the electron fuels membrane pumps that actively move hydrogen ions against their concentration gradient from the stroma into the thylakoid space. This is quite analogous to the process that occurs in the mitochondrion in which an electron transport chain pumps hydrogen ions from the mitochondrial stroma across the inner membrane and into the intermembrane space, creating an electrochemical gradient. After the energy is used, the electron is accepted by a pigment molecule in the next photosystem, which is called photosystem I (Figure 5.13). Q: What type of ions play critical roles in light-dependent reactions? Choices: - calcium - silicon - helium - hydrogen A:
A: hydrogen
Question: Answer the following question given this paragraph: Air quality is a measure of the pollutants in air. Poor air quality started to become a serious problem during the Industrial Revolution. After 1900, motor vehicles added greatly to the problem. The Clean Air Act of 1970 improved the quality of the air over the U. S. Q: Air quality is a measure of what in the air? Choices: - nitrogen - precipitation - oxygen - pollutants A:
Answer: pollutants
*Question*
Answer the following question given this paragraph: Primate ancestors also mainly ate fruit. They needed to be able to spot colored fruits in the leafy background of the trees ( Figure below ). They also had to be able to judge which fruits were ripe and which were still green. Ripe fruits are usually red, orange, yellow, or purple. Being able to see in color was important for finding food. It was an adaptation that would help fruit-eating primates survive. Q: Ripe fruits are usually red, orange, yellow, or what? Choices: - white - blue - black - purple A:
**Answer**
purple
*Question*
Answer the following question given this paragraph: In conduction, heat is transferred from molecule to molecule by contact. Warmer molecules vibrate faster than cooler ones. They bump into the cooler molecules. When they do they transfer some of their energy. Conduction happens mainly in the lower atmosphere. Can you explain why?. Q: What is the term for heat being transferred from molecule to molecule? Choices: - convection - oxidation - decomposition - conduction A:
**Answer**
conduction