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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.
Q. What is Phenylketonuria? The essential amino acid phenylketonuria is utilized for tissue protein synthesis and hydroxylated to form tyrosine. The hydroxylation reaction requ
In patients who have not received prior antibiotics and who will ultimately have blood culture positive endocarditis, it is likely that 95 - 100 per cent of all cultures obtained w
Define the Peripheral Nervous System (PNS) Peripheral nervous system consists of cranial and spinal nerves. There are twelve pairs of cranial nerves. They arise from brain.
What are twins? Genetically what are the two types of twins that can be generated? Twins are simultaneously generated (within the mother's uterus) offspring. Twins classify acc
Q. How does the sodium-potassium pump present in the cell membrane work? What is the significance of this protein for the cell? The sodium-potassium pump is the transport prote
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Asexual Reproduction in Animals Reproduction may be referred as production of true copies. Most of the animals that are quite familiar to us generate male and female gametes (
Nerve Cell - The Basic Unit The basic unit of the nervous system is the nerve cell or neuron. A neuron is to the nervous system what a brick is to the building. It has a cell
In which parts of the circulatory system are there valves? There are valves in the heart (between each atrium and ventricle, in the aorta and pulmonary artery), in some of the
Rheumatic fever is an immunologically mediated connective tissue disorder following throat infection with group-A streptococci (GAS). It is characterised by an inflammatory proces
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