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Q. How Tyndallisation used for sterilization?
John Tyndall devised a process of sterilisation by steaming for a few minutes at 100oC on 3-4 successive operations separated by 24 hour intervals at room temperatures. The principle is that the first exposure kills all vegetative bacteria; spores will germinate and be killed on subsequent occasions.
Which is plant tissues specialized in covering? The dermal tissues or covering tissues of the plants are the epidermis (that covers the leaves and the young stems and shoots) a
Class of Crustacea - Cirripedia These crustaceans are completely marine, and include the barnacles. Moa species are free living, attached to rock, and other objects. Some are
RESPIR A TIO N IN INSECT (COCKROACH) - Respiration is direct. So metabolic rate is high. This system is related to each cell of the body so respiratory pigment is ab
Define Affluence and abundant availability of food as factor for obesity? With increasing affluence, increase in purchasing power and abundance of food, people tend to eat more
Define the Clinical Manifestations of Underweight? Underweight may predispose to fatigue, lethargy and breathlessness. Iron-deficiency anaemia is usually seen because the diet
Q. How sex occurs in bacteria? Occurrence of sex in bacteria was first described by Edward Tatum and Joshua Lederberg in 1946 (Nature, volume 158, page 558) who were studying m
State the term in detail hydrostatic skeleton. Formed from a fluid-filled and closed cavity surrounded by a body wall comprising muscles oriented in different directions. Muscu
The oxidation of sugar in the cell of higher organisms takes place in the ?
a) What is biological magnification? b) Describe how DDT as a water pollutant undergoes biological magnification?
What are the grasslands of North America and of South America respectively called? The steppe grasslands of North America are known as prairies. The grasslands of South America
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