Short answer questions 1. Why should food not be left uncovered? 2. Do vectors get infected with the disease of the germs they carry? Give reasons. 3. How do landfills contaminate the environment? 4. What are deficiency diseases? Give two examples.
Answers
Explanation:
1 )Stale or uncovered food holds a lot of harmful bacteria which may cause diseases to our body. Hence, we should avoid eating stale or uncovered food
2) Vectors can carry infectious pathogens (germs) such as bacteria, viruses, and parasites that upon transmission become the causative agents of common diseases such as Lyme.
3) Disposal of liquid waste is not uncommon in landfills in arid areas. ... This waste rots and decomposes, and produces harmful gases (CO2 and Methane) which are both greenhouse gases and contribute to global warming. Landfills also pollute the local environment, including the water and the soil.
4) Diseases that occur due to lack of nutrients over a long period are called deficiency diseases. Examples are – Scurvy, Night blindness, Rickets, Beriberi, Goiter, Anaemia.
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