SCIENCE
BIOLOGICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Is the total mass of living material in a habitat
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The plant and animal material which has been decomposed
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The process by which soil organic matter is converted to humus.
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A community of microorganisms (e.g. bacteria and fungi) that inhabit a particular environment
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Detailed explanation-1: -Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. This material is called leaf litter. When animals die, their remains add to the litter. Over time, all this litter decomposes.
Detailed explanation-2: -The uppermost horizon is called the topsoil layer. The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus. Humus is rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects and twigs.
Detailed explanation-3: -Humus cannot be decomposed readily because of its intimate interactions with soil mineral phases and is chemically too complex to be used by most organisms.
Detailed explanation-4: -The word hummus comes from Arabic: , romanized: ḥummuṣ ‘chickpeas’. The full name of the prepared spread in Arabic is ḥummuṣ bi ṭaḥīna ‘chickpeas with tahini’.
Detailed explanation-5: -Humus Types. Three humus types, mor, moder, and mull form in upland forests under aerobic conditions. A thick mat of undecomposed to partially decomposed litter that is not significantly incorporated into the mineral soil, present in coniferous forests. Decomposition is accomplished primarily by fungi.