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LIGHTAll of us know that the sun is the ultimate source of energy for all activities in our biosphere. The electromagnetic radiations from the sun supply energy which warms up the earth and the atmosphere to provide a favourable global temperature for the living organisms. In addition. light plays a variety of roles in the living world. It is essential for photosynthesis, the process by which light is converted into usable chemical energy. It is involved in the transmission of information, for instance, it helps plants and animals to programme their life cycles. coordinates the opening of buds and flowers, dropping of leaves and a variety of other physiological processes. Variation in theamount of light generally affects the local distribution of plants. In animals light regulates reproduction, hibernation and migration and of course makes vision possible. All these biological phenomena are readily influenced by variation in the intensity, and by seasonal or diurnal variations of light.
What are heterochromatin and euchromatin? Chromatin is uncondensed nuclear DNA, the typical DNA morphology in interphase (the phase of the cell cycle in which the cells is not
Q. What are the main human diseases caused by fungi? The major human diseases caused by fungi in immunocompetent patients are , blastomycosis, histoplasmosis, paracoccidioidomy
history of biology
Define Significance and Impact of Plants and Animals on Human Life? Plants and animals both have a great significance and unparalleled impact on human life. Most of our needs a
As heart failure sets in, there is activation of RAS (Fig 2.1). Adrenergic stimulation of beta-1 receptors in juxtaglomerular apparatus of the kidneys results in release of renin.
Diestrus- Estrous cycle This lasts 60 to 70 hours during which functional regression of the corpora lutea occurs. The uteri are small, anaemic, and only slightly contractile.
What are the three main signs of diabetes? The three main signs of diabetes mellitus are called as the diabetic triad: polyuria, polydipsia and polyphagia. Polyuria is the e
respiration.
What is the root pressure? The Root pressure is the pressure that forces water from the soil to be absorbed by xylem of the root. It is because of the osmotic gradient between
Various cases are now known where variant tissues splice the main RNA transcript of a single gene by instead pathways, where the exons which are lost and those which are
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