(vi) What is a solar cell? Why are only solar cells used as a source of power in satellites?
(vii) What is rainwater harvesting? What are the two ways in which it can be done?
(viii) What is food web? How will you construct different food chains in a food wave?
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Answer:
(vi)Solar panels are used in artificial satellites because if a battery is fixed it will soon run out of power and it is impossible to use a wired switchfor the satellite.
(vii)Broadly there are two ways of harvesting rainwater, namely; surface runoff harvesting and rooftop rainwater harvesting. Rainwater harvesting is the collection and storage of rain for reuse on-site, rather than allowing it to run off. The stored water is used for various purposes, such as gardening, irrigation, etc
(viii) A food web consists of all the food chains in a single ecosystem. ... Producers, also known as autotrophs, make their own food and do not depend on ... We also eat animals and animal products, such as meat, milk, and eggs. ... In an ocean ecosystem, many types of fish and turtles are herbivores that eat ...
Explanation:
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