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Precipitation
Precipitation literally means falling from a height. In case of water, precipitation includes all forms in which atmospheric moisture descends to earth; rain, snow, hail, sleet and dew. The moisture that enters the atmosphere by the vaporisation of water condenses either into liquid (rain) or solid (snow, hail and sleet) before it can fall. Water returns to the land and the sea from the atmosphere by means of condensation, deposition and precipitation. Condensation is defined as the process by which water changes from vapour phase to a liquid state (in form of dew droplets). Deposition is the process by which water changes directly from a vapour into a solid (ice crystals) phase. In the atmosphere tiny droplets of water and ice crystals produced through condensation and deposition form clouds. You have to keep in mind that vaporisation absorbs energy (evaporation of sweat cools your body by using up excess body heat.) The energy used up in vaporisation is released when the water vapour condenses. The major amount of water on earth, is received as rainfall.The water cycle in nature is sustained by energy from the sun. Solar energy evaporates water from the sea and the land. Water vapours condense in the atmosphere to form clouds which are transported to long distance by wind currents. Rainfall and melted snow replenish water in rivers, which cany it back to to sea.
Photoreceptor - Phototropism The molecular nature of the photoreceptor is unsolved. Initially in the 1930s, some form of carotenoid was thought to be the phototropic receptor.
How are the fruits formed? The fecundation is in angiosperms triggers the release of hormones that act upon the ovaries. The ovary wall after that it develops into a fruit that
C o m p o s t i n g It is a modification of a conventional or solid manure handling system with anaerobic decomposition. Types of composting systems include windrow, b
What are the three categories in which food protein sources can be divided into Protein food sources can be separated into the following three categories: Proteins of pl
Q. What are Dopaminergic neurons? Dopamine Dopaminergic neurons occur in two closely connected groups: Ventral tegmental area (VTA) of the midbrain and Substantia nigra,(i
What are the synthetic auxins and what are their uses? The Synthetic auxins like naphthalenic acid (NAA) and indolebutyric acid (IBA) are substances similar to IAA (a natural a
Gastrointestinal System The purpose of digestion is to change the food by chemical action and convert it into simple form to be utilized by various tissues. The process of dige
The effect of natural selection on colonies or population favouring one group in preference to other may be referred to as group selection. A group can be the smallest collection o
What are the elements that constitute the stomata? The Stomata is made of a central opening the ostiole or slit delimited by two guard cells responsible for its closing or open
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