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a) What is the special property of a 'persistent' insecticide?
b) In what ways is 'persistence' (i) a useful property, (ii) a harmful property?
(a) A persistent insecticide is chemically stable, i.e. it takes a long time to break down.
(b) (i) This property is useful because the substance will continue to kill insects long after it has been applied.
(ii) 'Persistence' is damaging due to the insecticide lasts long enough to pass up a food chain and become concentrated in the bodies of secondary or tertiary consumers.
What is Waist-to-Hip Ratio? Waist-to-Hip Ratio (WHR) is defined as the measurement of waist circumference divided by hip circumference. For example, if a person's waist measure
Q. What do you mean by Pericardial effusion? Collection of fluid in the pericardial sac is known as Pericardial effusion. All cases of pericarditis can lead to pericardial effu
It is defined as the presence of chemicals and particulate in the atmosphere in quantities and pollution that are harmful to human health and environment. It occurs when the concen
Explain about the Simple Proteins? Simple proteins are those that are made of amino acid units just joined by peptide bond. Upon hydrolysis they yield a mixture of amino acids
The term cardiac cycle means one pumping cycle which consists of contraction (systole) and relaxation (diastole) of both the atria and both ventricles. Both the atria contract at t
What are the elements that constitute the stomata? The Stomata is made of a central opening the ostiole or slit delimited by two guard cells responsible for its closing or open
Advantages of ecological pyramids?
When coal is carbonized coke is formed along with coal gas. 1300 0 C Coal coke + coal gas
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