| i could really use some help with biology?????/?
last assignment of the year1: What does hoeing the garden (or running a cultivator on a farm) do besides tearing out the weeds?Kills the roots of plantsAerates the soil and loosens itAllows young plants more room to grow2: In the spring of the year maple trees are tapped for sap to make sugar. True/False and why?True, maple trees are tapped in the spring because the sap begins to flow and the starch that was stored in the roots all winter changes back into sugarFalse, maple trees are not tapped in the spring because after the winter there is not enough sap to bother extracting. It must build up through the spring and summer.False, maple trees are tapped in the fall to ensure that the tree has enough energy stored to make it through the winter.3: When you tap maple trees, you should you cut through the bark and into the wood. True/false and why?False, if you tap into the wood you risk killing the treeTrue, you must tap into the wood because you must reach the layer where the sap is being transportedTrue, you must tap into the tree because the sap on the bark is too dirty to use4: When you transplant flowers in the garden, you should take the roots up with a ball of earth about them-rather than loosen the soil and pull the roots out. True/false and why?True, because if you disturb the soil around the roots, you may damage the fragile root hairs and impair the plant�s ability to absorb enough waterTrue, because the soil around the roots already contains the nutrients the plant needsFalse, because the plant has already used up the nutrients in the soil around it. The old soil should be shaken off so the plant can find the fresh soil more easily.5: It is a bad idea for you to wash the leaves of your house plants. True/false and why?True, soap can enter the plant through its leaves and kill it.False, washing the leaves allows the plant to absorb water through its leaves as well as through its roots and helps the plant absorb carbon dioxide fasterFalse, washing helps remove dust from leaves and allows the plant to absorb and release carbon dioxide and oxygen more easily.6: What advantage is there in keeping water plants in a fish aquarium?It is healthier for fish to eat water plants in addition to fish foodThe plants absorb toxins in the water so the fish will not die as easilyThe plants produce oxygen in the water that the fish can breathe7: The cod and other fish caught on the Banks of Newfoundland are heavier (and the total catch is heavier) during sunny seasons than cloudy seasons. True/false and why?False, the fish are lighter in sunny seasons because more algae grows. The algae compete with the crustaceans that are cod�s food source, and so the fish have less to eat.True, the fish are heavier in sunny season because more algae grows. Small crustaceans feed on the algae, and the cod feed on the small crustaceans. More algae means more crustaceans, and so there is more food for the cod.True, the fish are heavier because more birds are able to find fish in sunny weather. The more fish the birds hunt, the less competition the remaining cod face for their food and the heavier they become.8: Potato beetles do not eat the tubers of the plant which man uses; they feed only on the leaves. Why take the trouble to poison the beetles then?Because beetle dung causes the potatoes to have a bitter flavorBecause if the leaves are destroyed no photosynthesis takes place and the plant has no extra food to be stored as a potatoBecause the beetles burrow into the potatoes to lay their eggs9: Why does the florist sprinkle water on the walls and walks in his greenhouse as well as on the soil and growing plants?Because this produces the best conditions for growth by keeping the leaves clean and the air moistBecause florists move plants according to the sunlight and would have to keep repositioning the sprinklersBecause some plants grow out of their pots without the florist noticing
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05-29-2008, 06:53 PM
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