Total Marks 20
Section 1: Answer any 5 of the following (5X2 = 10 Marks)
1) What is evaporation?
2) What is the composition of it?
3) What is the role of water in our diet?
4) Why should we avoid eating junk food?
5) What is the role of decomposers in the ecosystem?
6) Differentiate between biotic and abiotic components?
Section 2. Answer any 2 of the following questions (23 = 6 Marks)
1) Write a short note on Rainwater harvesting
2) Define air pollution and mention any 3 causes of it
3) Describe the symptoms of souny, goiter and anemia
Section 3: Fill in the blanks 4x1 = 4 Marks)
1) The full form of pollutant CFC
2) The reverse of condensation is
3) Water regulates body temperature through the
process
4) The female reproductive part of a flower is
Answers
Answer:
section 1
Answer 1. Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.
Answer 4. Eating junk food on a regular basis can lead to an increased risk of obesity and chronic diseases like cardiovascular disease, type 2 diabetes, non-alcoholic fatty liver disease and some cancers. We know Australian's eat too much junk food. 35% of adults' daily energy intake (kilojoules) comes from junk food.
Answer 6. abiotic components are non-living chemical and physical factors in the environment which affect ecosystems. Biotic describes a living component of an ecosystem; for example organisms, such as plants and animals.
Answer 5. Decomposers feed on dead things: dead plant materials such as leaf litter and wood, animal carcasses, and feces. They perform a valuable service as Earth's cleanup crew. Without decomposers, dead leaves, dead insects, and dead animals would pile up everywhere.
Answer 3. Water is an important part of all body functions and processes, including digestion and elimination. When you're on a diet, water also acts as a weight-loss aid because it can help you eat less. "Drinking water is important during weight loss because it provides hydration without unwanted calories.
section 2
Answer 1. Rainwater harvesting (RWH) is the collection and storage of rain, rather than allowing it to run off. ... Rainwater harvesting differs from stormwater harvesting as the runoff is collected from roofs, rather than creeks, drains, roads or any other land surfaces.
Answer 2. Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires. The solid and liquid particles suspended in our air are called aerosols.
section 3
Answer 1. Chlorofluorocarbons (or CFCs) is an organic compound that contains carbon, chlorine, and fluorine, produced as a volatile derivative of methane and ethane. A common subclass is the hydro-chlorofluorocarbons (HCFCs), which contain hydrogen, as well. They are also commonly known by the DuPont trade name Freon.