2017 NECO GCE Biology obj and essay Expo, NECO GCE 2017 biology obj and theory expo, 2017 NECO GCE biology obj and essay Expo Essay Questions 2017, NECO GCE biology Paper III Objectives Questions and Answers 2017
Exam Time: Tuesday 21st Nov. 2017
Biology Paper III & II (Objective & Essay)
2.00 pm – 4.30 pm
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BIOLOGY OBJ:
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1-10: CBDCEEECEA
11-20: EBABDABDDE
21-30: BEEDCDACCC
31-40: BAAADBBBEA
41-50: EABDCDAAEC
51-60: ABCBACCDBB
Examhot.com #cares
NECO GCE BIOLOGY OBJ AND ESSAY ANSWERS FROM EXAMHOT.COM
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BIOLOGY THEORY:
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(1ai)
Sexual reproduction:This is a type of reproduction which involves the fussion of male gametes(eg sperm cell) and the female gametes(eg egg cell) to form zygote which later develops to a young offspring
(1aii)
-Abstinence
-Birth Control Sponge (Today Sponge)
-Birth Control Vaginal Ring (NuvaRing)
-Birth Control Shot (Depo-Provera)
-Birth Control Implant (Implanon and Nexplanon)
(1aiii)
-Mutualism represents a symbiotic relationship where both species involved benefit from the relationship while commensalism represents a symbiotic relationship where only one organism benefits while the other does not benefit from the relationship
-Good examples for mutualism include the relationship between bees and flowers as well as humans and digestive bacteria while Examples for commensalism include hermit crabs using dead gastropods for shelter or millipedes travelling on birds
(1b)
(i)Hooks and suckers allow it to hold on tightly to the wall of the intestine
(ii)Its flat body gives it a large surface area to absorb food
(iii)It has no need of a mouth or gut as it absorbs already digested food
(1ci)
DRAW THE DIAGRAM
(1cii)
-Evidences from Palaeontology
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2a.
–Canning.
–Freezing.
–Drying.
–Fermenting
2aii
*Vector*
A vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another.
*REFUSE*
Refuse are substances which is discarded after primary use, or it is worthless, defective and of no use.
*SEWAGE*
Sewage can be defined as the waste water from domestic, commercial and industrial sources carried by sewers.
2b.
–Water
–Solute
2c..
Drawing
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NO5a i
Respiration is the exchange of oxygen and carbon dioxide between the toad and its environment. Oxygen is taken into the body and carbon dioxide is given off. Every cell of the body consumes oxygen. With the help of oxygen, the assimilated food which is stored within the cells is slowly oxidised.
The result is the liberation of heat energy, and formation of carbon dioxide and water. Thus when glucose is oxidised, one molecule of glucose combines with six molecules of oxygen to form six molecules of carbon dioxide and six molecules of water.
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NO5a ii
(1) consideration of the oxygen isotopic records of low latitude temperature variations;
(2) discussion of the physical arguments for temperature stability within the tropics;
(3) examination of climate model-derived tropical temperatures;
(4) examination of model evidence for tropical salinity differences between different time periods in Earth history
5bi
i. Natality (birth rate):This refers to the rate of given birth to new organisms. This generally (be it plants or animals) leads to increase in population.
ii. Mortality (death rate):This refers to the rates at which organisms die in a habitat. Mortality generally leads to a decrease in population.
iii. Immigration (dispersal):This is the movement of organisms from different habitats into a new habitat. This tends to increase the population of this new area.
Iv. Emigration: This is the movement of organisms out of a habitat due to either scarcity of food or unfavourable conditions or for breeding purposes. This, however, reduces the population of a habitat.
V. Availability of food: The availability of food in a given habitat tends to increase the population of that habitat through rapid rate of reproduction and other organisms coming into feed.
NO5bii
i. homozygousis when a cell has two identical copies of a gene. An example ofhomozygousis a cell
ii. heterozygote -is an individual having two different alleles of a particular gene or genes, and so giving rise to varying offspring
iii. parasite- an organism that lives in or on an organism of another species (its host) and benefits by deriving.
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