what is the importance of the sun to the biological or physical processes?
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To add to Diamond's explanation, remember the food chain that you learned about in lower school?  Small animals eat plants.  Larger animals eat smaller animals and so on and so forth until the top of the food chain dies and decays back into the soil to be used in the growth of new plants.  But the plants need sunlight to live by way of photosynthesis.  And that light comes from the sun of course.\nSo in addition to the heating of the earth and being the engine that powers our weather (which distributes liquid water--another thing plants need--all over the planet) the sun also sustains the cycle of life and the food chain.
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You asked for it! Ha ha ha ha!\n\nWhat is the sun? Read this.....\nI  INTRODUCTION \n\nSun, closest star to Earth. The Sun is a huge mass of hot, glowing gas. The strong gravitational pull of the Sun holds Earth and the other planets in the solar system in orbit. The Sun’s light and heat influence all of the objects in the solar system and allow life to exist on Earth. \n\nThe Sun is an average star—its size, age, and temperature fall in about the middle of the ranges of these properties for all stars. Astronomers believe that the Sun is about 4.6 billion years old and will keep shining for about another 7 billion years. \n\nFor humans, the Sun is beautiful and useful, but also powerful and dangerous. As Earth turns, the Sun rises over the eastern horizon in the morning, passes across the sky during the day, and sets in the west in the evening. This movement of the Sun across the sky marks the passage of time during the day (see Sundial). The Sun’s movement can produce spectacular sunrises and sunsets under the right atmospheric conditions. At night, reflected sunlight makes the Moon and planets bright in the night sky. \n\nThe Sun provides Earth with vast amounts of energy every day. The oceans and seas store this energy and help keep the temperature of Earth at a level that allows a wide variety of life to exist. Plants use the Sun’s energy to make food, and plants provide food for other organisms. The Sun’s energy also creates wind in Earth’s atmosphere. This wind can be harnessed and used to produce power.\n\nWhile it lights our day and provides energy for life, sunlight can also be harmful to people. Human skin is sensitive to ultraviolet light emitted from the Sun. Earth’s atmosphere blocks much of the harmful light, but sunlight is still strong enough to burn skin under some conditions (see Burn). Sunburn is one of the most important risk factors in the development of skin cancers, which can be fatal. Sunlight is also very harmful to human eyes. A person should never look directly at the Sun, even with sunglasses or during an eclipse. The Sun influences Earth with more than just light. Particles flowing from the Sun can disrupt Earth’s magnetic field, and these disruptions can interfere with electronic communications.\n\nII  PHYSICAL CHARACTERISTICS \n\nThe Sun is large and massive compared to the other objects in the solar system. The Sun’s radius (the distance from its center to its surface) is 695,508 km (432,169 mi), 109 times as large as Earth’s radius. If the Sun were hollow, a million Earths could fit inside it. The Sun has a mass of 1.989 × 1027 metric tons. This number is very large. Written out, it would be the digits 1989 followed by 24 zeroes. The Sun is 333,000 times as massive as Earth is. Despite its large mass, the Sun has a lower density, or mass per unit volume, than Earth. The Sun’s average density is only 1.409 g/cu cm (1.188 oz/cu in), which is a quarter of the average density of Earth.\n\nThe Sun produces an enormous amount of light. It generates 3.83 × 1026 watts of power in the form of light. In comparison, an incandescent lamp emits 60 to 100 watts of power. The temperature of the outer, visible part of the Sun is 5500°C (9900°F). \n\nFrom Earth the Sun looks small, because it is far away. Its average distance from Earth is 150 million km (93 million mi). Light from the Sun takes about eight minutes to reach Earth. This light is still strong enough when it reaches Earth, however, to damage human eyes when viewed directly. The Sun is much closer to Earth than any other star is. The Sun’s nearest stellar neighbor, Proxima Centauri (part of the triple star Alpha Centauri), is 4.3 light-years from our solar system, meaning light from Proxima Centauri takes 4.3 years to reach the Sun. The Sun is so much closer to Earth than all other stars are that the intense light of the Sun keeps us from seeing any other stars during the day.\n\nA  Importance to Earth \n\nEarth would no
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Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things.
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Plants use the energy of sunlight to grow using a process call photosynthesis (light - putting together) taking in carbon dioxide from the air and giving up oxygen.  At night the light of the moon (reflection of sunlight) is too weak to support photosynthesis and the plant actually uses oxygen rather than make it.
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solar radiation - UV rays are damaging to the DNA of skin cells and can result in cancer
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the Sun,and the earths Bio-mass.\nthe sun makes it hot (you may know that already)\nand the trees(bio-mass) absorb heat and release it .\nso regulating temperatures between day and night.\nthe ozone layer and aquifiris manta(atmosphere ,clouds,mist etc.)\nworks as a filter and determines how much sun(heat)is allowed to enter.
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Well, for one thing, the magnetic poles of the Earth are responsible for how much UV radiation reaches the ground.  So, the poles help regulate the amount and type of sunshine for a plant.  Another thing is that the the magnetic fields surrounding the planet affect the weather in a big way.  Weather affects plants.
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The lunar cycle is of lesser importance than the solar cycle of 365(+) days.  Human's - the early farmers - needed the solar cycle to tell them when to plant crops.\n  On the other hand, the lunar cycle is helpful in predicting tides, important to sea-goers.
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http://en.wikipedia.org/wiki/Sun
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Mean distance from\nEarth 149.6×106 km\n(92.95×106 mi)\n(8.31 minutes at the speed of light) \n\n--\nThe Sun is the spectral type G2V yellow star at the center of Earth's solar system. The Earth and other matter (including other planets, asteroids, meteoroids, comets and dust) orbit the Sun. Different latitudes of the Sun rotate at different rates; a point on the equator takes 25 days to complete a rotation, while a point at a pole takes 36 days. The resultant torsion creates the Sun's very strong magnetic field, which in turn drives the 11-year cycle of solar activity. The Sun accounts for more than 99% of the solar system's mass. Energy from the Sun has supported almost all life on Earth through photosynthesis since the appearance of the first organisms. Humans use sunlight for eyesight, warmth, growing crops, and powering solar cells.\n\nThe Sun is a ball of plasma with a diameter of 1.392 million km (864,950 mi) and a mass of about 2.0×1030 kg, which is somewhat greater than that of an average star in the Milky Way galaxy. About 74% of its mass is hydrogen, with 25% helium, and the rest made up of trace quantities of heavier elements. The Sun is about 4.6 billion (109) years old and is about halfway through its main sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. About 5 million tons of matter are converted into energy within the Sun's core every second, producing neutrinos and solar radiation. In about 5 billion years, the Sun will evolve into a red giant and then a white dwarf, creating a planetary nebula in the process.
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Solar Power harnesses the energy of the sun to turn water into high pressure steam. The sun gives panels which heat the water kinetic energy to affect the interaction energy of the water (like how you get a sunburn). The steam rotates a turbine to generate power.
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water is an important component that contribute to plant growth..water can liquidify the chemical substances inside the plant and the nutrient can be readily absorb by the flowers....water reach flowers by the transpirational pulls
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who needs the water cycle with out the sun. all living things would die without the sun.
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What is Photosynthesis? Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into ATP, the "fuel" used by all living things. The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive. Oh yes, we need the food as well!\n\n-------------------------------------------------------------\nSuagr and Oxygen is produced. I think thats right.
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You would surmise, that since the sun is the source of the heat for the\nearth and atmosphere, that the atmosphere should be warmer at points closer\nto the sun, like at the TOP of the atmosphere, instead of the reverse.\n\n   But the atmosphere is not warmed directly by the sun...it is warmed by the\nEARTH...!  Most of the energy from the sun arrives at the earth in the form\nof light energy, or short-wave energy. The atmosphere is transparent to\nshort-wave energy, and most of the solar energy reaches the surface of the\nearth, where it is absorbed. This energy warms the surface of the earth,\nwhich, in turn, warms the atmosphere with long-wave energy. The type of\nenergy radiated by a star primarily depends on the temperature. So the\nenergy from the sun arrives at the earth as short-wave (in the visible part\nof the spectrum) energy, and leaves the earth as long-wave (in the infra-red\npart of the spectrum) energy.\n\n   The atmosphere is not transparent to long-wave radiation, and absorbs the\nheat energy from the earth. That part of the atmosphere closest to the earth\ngets the most energy and is the warmest.\n\n   Because the sun is nearly overhead in the latitudes nearest the equator,\nthose locations receive more solar energy per unit area, and become warmer\nthan those locations near the poles. This difference in the amount of energy\nreceived and subsequent heating of the atmosphere and evaporation of water\nfrom the lakes and oceans, is what drives the "weather machine" on the\nearth.
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The Sun produces energy through a process called "nuclear fusion." This is the same process that happens in a hydrogen bomb. The Sun converts hydrogen into helium, and that conversion process releases energy, mostly in the form of heat. The Sun "burns" about 600-million tons of hydrogen every second.
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Chromosones record genetic information. And aren't even organelles, they're part of the nucleus. ---> X\nNucleus ----> X\n\nMitochondria turn sugar into AtP (energy).\nChlorpasts store solar energy in the form of sugar.\n\nMitochondria function whenever oxygen is present and sugar is available.\nChloroplasts whenever CO2 and sun-light are available.