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Saprotrophs Video Lecture | Science Class 7

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FAQs on Saprotrophs Video Lecture - Science Class 7

1. What are saprotrophs and how do they obtain nutrients?
Ans. Saprotrophs are organisms that obtain their nutrients by decomposing dead organic matter. They secrete enzymes to break down complex organic compounds into simpler forms, which can then be absorbed by the saprotrophs for their nutrition.
2. How do saprotrophs contribute to ecosystem functioning?
Ans. Saprotrophs play a crucial role in ecosystem functioning by recycling nutrients. They break down dead organic matter, such as fallen leaves and dead animals, into simpler compounds. This decomposition process releases nutrients back into the soil, making them available for other organisms to use and ensuring the continuous cycling of essential elements in the ecosystem.
3. Can saprotrophs cause diseases in humans?
Ans. While saprotrophs primarily decompose dead organic matter, some species can cause diseases in humans. For example, certain fungi belonging to the genus Aspergillus can produce toxins that cause respiratory illnesses when inhaled. It is important to handle and dispose of organic waste properly to minimize the potential for human health risks associated with saprotrophs.
4. How do saprotrophs differ from parasites?
Ans. Saprotrophs obtain their nutrients from non-living organic matter, such as dead plants and animals, while parasites derive their nutrition from living hosts. Unlike saprotrophs, parasites actively infect and consume the tissues or fluids of their host organisms, often causing harm or disease to the host.
5. What is the ecological significance of saprotrophs in nutrient cycling?
Ans. Saprotrophs are essential for nutrient cycling in ecosystems. By decomposing dead organic matter, they break down complex molecules into simpler forms, releasing nutrients like nitrogen, phosphorus, and carbon back into the environment. These recycled nutrients are then available for uptake by plants and other organisms, ensuring the sustainability of ecosystems.
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