Q6- Answer the following question in details (30) marks.
1. Explain the function of each organ in the human respiratory system?
2. Explain the following of the heart?
3. Describe the various ways by which seeds are dispersed?
4. Describe some devices used in earlier times for measurement of time?
5. What is an electric fuse? How does it work
Answers
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1. Explain the function of each organ in the human respiratory system?
⇢Your respiratory system is the network of organs and tissues that help you breathe. This system helps your body absorb oxygen from the air so your organs can work. It also cleans waste gases, such as carbon dioxide, from your blood. Common problems include allergies, diseases or infections
2.Explain the following of the hea rt?
⇢ He art: The muscle that pumps blood received from veins into arteries throughout the body. The heart is positioned in the chest behind the sternum (breastbone); in front of the trachea, esophagus, and aorta; and above the diaphragm.
3. Describe the various ways by which seeds are dispersed?
⇢ There are five main modes of seed dispersal: gravity, wind, ballistic, water, and by animals. Some plants are serotinous and only disperse their seeds in response to an environmental stimulus. Dispersal involves the letting go or detachment of a diaspore from the main parent plant.
4. Describe some devices used in earlier times for measurement of time?
⇢ Sun dials have their origin in shadow clocks, which were the first devices used for measuring the parts of a day. Ancient Egyptian obelisks, constructed about 3500 BC, are also among the earliest shadow clocks.