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Xerarch - Ecology
Successions initiated on bare rock, wind-blown sand, rocky talus slopes, or other situations where there is an extreme deficiency of water are termed xerarch. Here, we shall discuss the example of a bare rock. It is not only deficient in water but also lacks any organic matter, having only minerals in disintegrated, unweathered state.
The pioneers to colonise this primitive substratum are crustose type of lichens, and through a series of successive seral stages, the succession finally terminates into a forest which constitutes the climax community. As in the hydrarch, successive changes take place in both plants as well as animals, but changes in plants are more obvious than animals.
In chemistry and particularly in biochemistry the fatty acid is a carboxylic acid with a long aliphatic tail (chain) that is either saturated / unsaturated. Many obviously occurrin
Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectively conductive to a newly discovered divalent cation nam
INTRODUCTIO N - Karl Von Baer - Coined the term cleavage. Swammerdom - First time seen cleavage. Prevost and Dumas - Reported cleavage of frog's egg. Spllanzani - Detail
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Use of Bacterial vaginosis In pregnancy Bacterial vaginosis has been associated with premature labor and complications of delivery, and symptomatic bacterial vaginosis in preg
Explain the term Kwashiorkor? The term Kwashiorkor means the 'disease the first child gets when the second baby is born', that is, 'the sickness of the deposed child'. Thus, th
Galactosemia Inability of conversion of galactose to glucose results in the accumulation of galactose in the blood - known as galactosemia. The biochemical defect usuall
Q. Write the meaning of Polydypsia? Increased Thirst (Polydypsia): As the patient is losing more water through excessive urination, the patient feels thirstier and tends to tak
What is the significance of Pharyngeal gill slit ? Lateral opening in the wall of the pharynx which allows water to enter into the mouth and exit through the pharynx. This is on
write the classification of chordata?
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