AP BIOLOGY

ECOLOGY

CHEMICAL CYCLES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What does an “exchange of gases” mean?
A
It means that gases are apart of everything.
B
It means that orange juice is an upside down milkshake with a missing tail.
C
It means that humans and plants trade gases back and forth.
D
It means that carbon in apart of all living things.
Explanation: 

Detailed explanation-1: -Gas exchange commonly refers to the exchange of oxygen and carbon dioxide between a living thing and its environment. In animals, gas exchange happens during respiration (breathing). In plants, it happens during photosynthesis, which is the process by which plants make their own food.

Detailed explanation-2: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-3: -Gases are exchanged externally at the surface of the alveoli of the lungs. Gases are exchanged internally at the tissue surface. Animals release carbon dioxide into the surrounding atmosphere and take up oxygen while respiration. Whereas plants release oxygen and consume carbon dioxide from the atmosphere.

Detailed explanation-4: -In a way, they are a cycle-plants help humans breathe by providing us with oxygen, and humans help plants “breathe” by providing them with carbon dioxide.

Detailed explanation-5: -In plants, the exchange of gases takes place through stomata. Each of the stomata is surrounded by two guard cells, and these cells contain chloroplasts. A respiratory opening is found under each stoma, and the process of opening and closing of stomata depends on the presence of sugar and starch in the guard cells.

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