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Asteroid impacts: The hypothesis which links certain mass extinction events with the impact of the comet or asteroid, most particularly the mass extinction 65 million years which became the reason of disappearance of dinosaurs and many other reptilian groups. Asteroid impacts early in the history of earth also contributed to the formation of atmosphere and oceans.
In a school laboratory, what is usually regarded as evidence that photosynthetis has occurred in a plant
In what ways might (a) clothing, (b) housing, (c) writing, have contributed to the survival of human beings? a) Clothing and (b) housing provide warmth and shelter, and so hav
What is Chromosome Mapping in phenotypic trait? Chromosome Mapping : By noting how often a gene segment associated with a specific phenotypic trait crossed over during meios
Male reproductive system of frog: i) Testis : a) There are a pair of testis which are attached to the kidneys. b) They are oval and yellow in colour. c) Inside the testis th
Explain the Obesity - Problems of Older Children and Adolescent Nutrition? One of the major problems is raising obesity rates (upto 30%) in urban, well-to-do school children.Th
Determination of Vitamin A Vitamin A assay is carried out by chemical method. This method is called Carr Price Reaction. Vitamin A and the carotenoids produce an intense b
Vitamin C (Ascorbic acid) Vitamin C, ascorbic acid is also called anti-scorbutic vitamin. Ascorbic acid occurs as white crystals or white crystalline powder without odour and o
LAMPBRUS H CHROMOSOMES Discovered by Ruckert . Lampbrush Chromosomes were seen in Oocytes of several different animals like shark, amphibians, reptiles and birds. (Most
Which of the following are true for ventilation? A. The problems with ventilation induced by injection of curare occur because of the drug's direct action on nicotinic ACh Rec
Define Food Intake and Energy Requirements for Humans? Many studies have shown that the subjects loose significant amounts of body mass; fat mass, as well as, fat free mass du
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