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Pollution - Environmental Pollution
Pollution refers to any undesirable change in the physical, chemical or biological characteristics of our environment, i.e. air, water and oil that may or will adversely affect humans or other species and life support systems of our biosphere directly or indirectly. A substance whose introduction into a resource damages the latter's usefulness is called a pollutant. Pollutants are grouped into two broad categories:
The non-biodegradable pollutants such as heavy metals, pesticides, move through the food chain and may get magnified to dangerous levels in higher trophic level organisms. Some of these combine with other compounds and produce toxic substances. However, biodegradable materials such as human and animal wastes, agro-based residues and fertilisers can also pose a threat if their quantities or inputs exceed the Assimilative capacity of the environment.
Briefly explain the following feeding mechanisms in holozoic organisms: filer feeding,fluid feeding and deposit feeding.
Vasoactive substances such as Endothelium Derived Relaxing Factors (EDRF). Prostacyclin and Endothelin can be formed in the vascular endothelium. Endothelial dysfunction can lead t
Explain the types of modified gellan gum There are 3 types of modified gellan gum. (a) High acetyl gellan (partially deacetylated), which provides a thermo reversible gel,
Question Write a short note on the following 1 Simple diffusion 2 Viscosity 3 What is spectroscopy? List and explain types of spectroscopy 4 With a neat diagram,
what exactly is oxidation and reduction potential and how its an imp. factor in spoiling meat
How can the hypothesis that asserts that chloroplasts as well as mitochondria were primitive prokaryotes that associated in mutualism with primitive anaerobic eukaryotic cells be c
Name some emulsifiers which are present in nature? There are many emulsifiers which are present in nature such as phospholipids e.g. lectin which is present in egg yolk which a
Illustrate the thin and think filaments in the muscle fiber A healthy skeletal muscle fiber is isolated and has no external forces on it. It has normal intracellular levels of
You are interested in plant life history evolution, you come across a population of the California poppy that i spolymorphic (mixed) for both iteroparous ans semeparous individuals
If a lipid bilayer does not form in a test tube of phospholipids in a liquid solvent and instead the heads join together in a circular pattern, the most likely explanation is: a
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