100% Verified NABTEB GCE BIOLOGY OBJ: 1-10: ABABBBDCDC 11-20: ABDAAACABB 21-30: BCBDADCDAA 31-40: BBDAAABDBB 41-50: CDDBAACBCA NABTEB GCE 2014 BIOLOGY ESSAY ANSWERS 1ai. List three forms in which cell exists. Ans: i. colony, ii. filament and iii. single cell. Iaii. Give one example each of the forms listed in a(i) above. Ans: i. colony eg volvox,pandorina ii. Filament eg spirogyra,,oscillteria iii single cell eg. Amoeba,paramecium. 1bi. Mention 3 scientists that propounded the cell theory. Ans> mathias scleiden, robert hooke, rudolf virchow 1bii. In a tabular form, differentiate plant and animal cell. Ans: under plant cell, write a. Presence of cell wall b. Presence of chloroplast c. Presence of a large centrally place vacuole. D. They av a definite shape. E. Has a dense cytoplasm Under animal cell, write A. Absence of cell wall. B. Absence of chloroplast, c. Presence of small, conspicous vacuole d. Has no definite shape. E. Has a sparse cytoplasm 2. What is respiration? Ans: respiration is a process whereby energy is been derived through breaking down of food by the taking in of oxygen and release of carbon dioxide through complex actions. Bi. Difference btw aerobic and anaerobic respiration. Ans i. Aerobic respiration takes place in d presence of oxygen while anaerobic respiration takes place in d absence of oxygen. Ii. CO2 and water is produced at aerobic, lactic acid or alchohol is produced in anaerobic. Iii. Aerobic occurs in plant and animals while anaerobic occurs in bacterias and human muscle. Iv. Aerobic produces lots of energy while anaerobic produces less. Bii. I. Calcium oxalate II. Oxygen III. Water. 2.c. I. Holozoic II. Saprophytic III. Parasitic. 4a. I. It gives shape to the blood ii. It gives support iii. For movement iv. It gives protection v. For blood cell production and storage. Aii. I. Exoskeleton Ii. Endoskeleton iii. Hydrostatic skeleton 4c. I. Diabetes ii. Hemourhagic cystasis iii. Kidney stones iv. Osmotic diuresis 4b. Difference btw arteries and veins. Tabulate. Under arteries, write i. Carries blood away from the heart ii. Carries oxygenated bloods except the pulnomonary artery iii. Blood flows at high pressure iv. Valves are absent under vien, write i. Carries blood to the heart. Ii. Carries de-oxygenated blood except the pulnomonary vein iii. Carries blood at low pressure iv. Presence of valve to prevent the backward flow of the blood. 6a. A food chain is a linear feeding relationship that exists btw members of a community in which each organism feeds on the one preceeding it on the chain. B. Producer: majorly plants. Manufacture food for the whole chain. Are usually at d base of the food chain. Has the higest energy level. Herbivores: these are organisms that feeds on plants. Eg goat, cow. Decomposer: organsms that feed on dead and decay organisms. Bring about the re-circulation of energy. 6c. draw the food chain in aquatic habitat** ===COMPLETED===
Posted on: Thu, 27 Nov 2014 09:15:28 +0000
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