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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.
Endothecium - Anther Wall Layers The layer of cells lying immediately next to the epidermis is the endothecium, which is responsible for the dehiscence of the anther. It is us
In the presence of oxygen, the process of glycolysis produces which of the following products? A) 2 glycerol B) 1 lactate C) 2 lactate D) 2 pyruvate E) 1 pyruvate
If an enzyme-controlled reaction normally takes place at 10ºC, in general terms how will the reaction be affected by (a) a fall in temperature to 2°C , (b) a rise in temperature t
Promotion - Stages of carcinogenesis The second stage or promotion is reversible and does not include changes in structure of DNA but rather in the expression of the genome of
Define Biochemical and Metabolic Problems and their Management? Hypokalaemia (low concentration of potassium ion in the blood), we learnt earlier, is a problem caused due to se
Explain the senses taste and smell ? The pigmented cone cells of the retina transmit information to bipolar nerve cells, then to ganglion cells, and on to the optic nerve and t
How can amine groups be classified? Amines can be classify into primary amines, those to which one -R (variable radical) is attached to a -NH2, secondary amines, those where on
Define Nutritional Management of Anorexia Nervosa? The overall goal of nutritional rehabilitation of anorexia nervosa patients is to restore weight, normalize eating pattern, a
What is the role of Naupliar eye? The unique eye found in larval stage of the crustacean life cycle. This single compound eye is located medially, and with exception of copepod
What are examples of the ecological and economic importance of molluscs? Molluscs are significant players in several food chains in ecosystems. Many marine molluscs are part of
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