Explain the following statements giving appropriate reasons:
(i) Fertile soil has a lot of humus.
(ii) Lichens help in the formation of soil.
(iii) During summer, walking around a lake or a river, will give you relief from heat.
Answers
Answer:
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Explanation:
(i) Humus is the organic matter contained in soil, formed by the decomposition of leaves and other plant material by soil microorganisms. It provides nutrients to the plants and increases the ability of soil to retain water. Now, fertile soil contains lots of microorganisms, which decompose the dead animal and plant material and thus add humus to the fertile soil.
(ii) Lichens are a symbiosis of fungi and green algae living and growing on rocks where they help in the breakdown of the rocks’ surface by releasing some chemicals. These chemicals produce pores and crevices and thus help in weathering of rocks and formation of soil.
(iii) During summer days, the land near the lake or river gets heated up quickly but the water in lake or river remains cool. The wind above the land heats up, and hot air, being lighter, rises up, and the cool air above the lake/river flows to take its place causing a cool breeze to blow from lake/ river to land hence reduces the heat in the adjoining land area.
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i) As the soil contains dead matters like decaying plants etc, and some microorganisms too. And both provide nutrients to the soil by which soil gets fertile.
As the soil contains dead matters like decaying plants etc, and some microorganisms too. And both provide nutrients to the soil by which soil gets fertile.So if the soil contains more humus than it is more fertile as due to microorganisms and the dead decaying plants and animals.