(c) photosynthesis
B. Write 'T'for the true statement and 'F'for the false one:
1. The rate of breathing increases after rest.
2. The diaphragm moves up during exhalation
3. Frog can breathe through its skin as well as lungs.
Plants respire only during the day.
5. Breathing and respiration mean one and the same thing.
4.
Answers
1.The rate of breathing increases after rest- False.
When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) .
2.Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
3.TRUE.
Frogs have lungs like we do and if their lungs fill with water, they can drown just like us. Frogs can also breathe through their skin. They need to keep their skin moist to be able to breathe through their skin, so if their skin dries out they are not able to absorb oxygen.
4.FALSE.
Plant respiration occurs 24 hours per day, but night respiration is more evident since the photosynthesis process ceases.
5.FALSE.
As stated above, breathing is the biological process of inhaling and exhaling of the gases between the cells and the environment. The mechanism of breathing involves various respiratory structures such as the windpipe, lungs and nose. Respiration, on the other hand, is a chemical process that takes place in the cell.