IN A NATURAL ECOSYSTEM THE SUN'S ENERGY WILL BE CAPTURED BY THE TREES, GRASS OR OTHER HERBS AND CONVERTED INTO PROTEINS, CARBOHYDRATES AND OTHER FOOD COMPONENTS. THESE WILL BE CONSUMED BY PLANT EATING MAMMALS, BIRDS, INSECTS AND A GREAT VARIETY OF OTHER ANIMALS WHICH IN TURN WILL PROVIDE FOOD FOR THE MEAT-EATING ANIMAL. ALL LIVING ORGANISMS ULTIMATELY PROVIDE FOOD FOR THE ORGANISMS OF DECAY WHICH BREAKS DOWN THE PLANT AND ANIMAL MATERIALS AND RESTORE THE CHEMICAL COMPONENTS OF THE SOIL.
HERBIVORES FEED ON DIFFERENT PARTS OF A PLANT AND ALSO ON DIFFERENT PLANTS. GRAZING ANIMALS EAT UNHARVESTED HERBS AND GRASSES WHILE BROWSING ANIMALS EAT FOLIAGE OF SHRUBS AND TREES. SHEEP PREFER BROWSING ON HIGH HERBS, GOATS AND DEER ON BROAD LEAVED SHRUBS, CAMELS ON TENDER SHOOTS OF TALL TREES, WHILE HORSES AND CATTLE PREFER GRASSES.GRAZING AND BROWSING IN LIMITED NUMBERS IS BENEFICIAL BECAUSE LIGNEOUS VEGETATION BECOMES DRY AND INFLAMMABLE DURING HOT SEASONS WHEN TEMPERATURES SHOOT UP. LIGHT TRAMPLING BY ANIMALS MIXES HUMUS AND LITTER . HERBIVORES ALSO KEEP A CHECK ON PLANT GROWTH. A NUMBER OF PLANTS GIVE SHELTER TO ANIMALS, BIRDS, INSECTS, REPTILES AND MICROBES APART FROM PROVIDING THEM PALATABLE FOOD.
PLANTS MODIFY THE PHYSICAL ENVIRONMENT AND MAKE IT MORE CONGENIAL FOR HUMAN AND LIVING . THEY ACT AS WIND BREAKERS TO STORMS AND GALES THERE BY REDUCING THEIR VELOCITY, AND THUS REDUCING ENVIRONMENTAL DAMAGE, ESPECIALLY SOIL EROSION. PLANTS ALSO HELP IN MODERATING TEMPERATURE CONDITIONS, AND THROUGH TRANSPIRATION HELP IN BRINGING LOCAL RAIN. PLANTS ABSORB LARGE QUANTITIES OF WATER WHICH IN TURN PREVENTS WATER LOGGING OR FLOODING, IN CATCHMENT AREAS THEY RETAIN LARGE AMOUNTS OF WATER WHICH BECOMES AVAILABLE TO SPRINGS AND RIVERS. THE ROLE OF PLANTS IN NATURE AND ITS INHABITANTS IS INDISPENSABLE AS THEY ARE CLOSELY RELATED TO BOTH, THE BIOTIC AND ABIOTIC COMPONENTS OF THE ENVIRONMENT.
A NUMBER OF ANIMALS, ESPECIALLY INSECTS ARE INVOLVED IN POLLINATION OF FLOWERS. THEIR BODIES HAVE BEEN FRAMED TO SUCK NECTAR, EAT/COLLECT POLLEN GRAINS AND PERFORM POLLINATION. SOME FLOWERS ARE ALSO POLLINATOR SPECIFIC. FLOWERS OF SNAP DRAGON (DOG FLOWER) HAVE CLOSED LIP-LIKE PETALS WHICH OPEN ONLY WHEN AN INSECT LANDS OVER ITS LOWER LIP. THESE ARE THE MAJOR POLLINATORS OF CROP PLANTS. FRUITS AND SEEDS OF MANY PLANTS ARE DISPERSED BY ANIMALS ESPECIALLY BIRDS AND ANIMALS. IN MANY CASES PLANTS PROVIDE FOOD TO ANIMALS FOR THIS JOB. THE GALL WASP LAYS EGGS INSIDE THE LEAVES AND YOUNG STEMS TO ENSURE THEIR PROTECTION, HATCHING AND FEEDING.
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