Qno.6 ) Give reason
(a) Diseases spread on a large scale during periods of heavy rainfall and floods.
(b) There is a possibility of food
poisoning if we eat stale food.
p(c) Soil is turned over during tilling.
(d) Fungus grows quickly in moist or
humid conditions.
(e) A refrigerator is used in almost
every home.
(f) Bread 'rises' during baking.
(g) Fodder is soaked in water before
offering to cattle.
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class :-7th
sub:- science
lesson no. :- 11 .cell structure and micro organisms
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every thing is mentioned upwards ☝☝☝☝☝☝☝
Answers
Answer:
1. Floods can potentially increase the transmission of the following communicable diseases: Water-borne diseases, such as typhoid fever, cholera, leptospirosis and hepatitis A. Vector-borne diseases, such as malaria, dengue and dengue haemorrhagic fever, yellow fever, and West Nile Fever.
2. There is a possibility of food poisoning if we eat stale food because there are chances that it can be infested by microorganisms. Bacteria and fungi can infect the foods which are stored for longer durations of time. For example, the greenish powdery substance which is seen on stale bread is an example of fungus infection.
3. Tilling for Severely Compacted Soil. Compacted soil that is heavy in clay makes it difficult for roots to push through and grow. To break up compacted soil, you will need to till the soil and then work organic matter into the soil so it retains its loosened texture.
4. Fungus grows quickly on moist or humid conditions. This statement is 100 percent correct because moisture and humidity are the basic requirements for the fungus to grow. We know that temperature of the humid places is mostly higher, which is ideal condition for fast reproduction of mold spores and thus fungus.
5. Refrigerator is used in almost every home because it prevents the spoilage of food. Refrigerator provides an optimum environment for storage of vegetable, fruits, cooked and uncooked food. If an optimum temperature is not provided, it can lead to the growth of bacteria and fungi thus leading to spoilage of food
6. In bread making (or special yeasted cakes), the yeast organisms expel carbon dioxide as they feed off of sugars. As the dough rises and proofs, carbon dioxide is formed; this is why the dough volume increases. The carbon dioxide expands and moves as the bread dough warms and bakes in the oven. The bread rises and sets.
7.Fodder is soaked in water before offering it to cattles because it may contain seeds which have been left behind after harvesting. Soaking this fodder helps in the sprouting of these seeds/grains and thus increases the nutritional value of the fodder.
Answer:
a) 1. due to floods there is shortage of clean, Safe drinking water. 2) it gets contaminated with sewage And dirt having disease causing pathogens, causing Disease of alimentary tiphoid, cholera. 3) due to stagnant Water, many mosquito se bred on If and Cause diseases Like malaria, dengue, ETC.