The Real and Verified NABTEB GCE Biology OBJ, ESSAY/Theory Questions and Answer – Nov/Dec 2017 Expo Runz
Bio OBJ:
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Theory part
1ai)
i)as a colony eg volvox
ii)as a filament eg spirogyra
iii)as a part of a living organism eg amoeba
1aii)
ADVANTAGES
i)it leads to cellular differentiation
ii)it leads to internal structural specialisation
iii)it increases adaptation of environment
iv)complexity leads to efficiency
v)complexity leads to increase in size
vi)mutual interdependence between component cell
DISADVANTAGES
i)inability of individual
cells to exist on their own
ii)difficulties in acquisition of oxygen and food materials
iii)it leads to slower rate of diffusion
iv)slower rate of expulsion of waste products
v)difficulties in reproduction
vi)decreases in ability to regenerate
1bi)
VIRUS AS A LIVING THING
i)virus is on the borderline between living things and non-living things
ii)it possesses characteristics which can
be transmitted from one generation to the other
1bii)
VIRUS AS A NON-LIVING THING
i)when a virus is extracted from a living cell and placed in a non living medium, it assumes a crystalline and thus become non living
2ai)
i)carbon (iv) oxide derive from the atmosphere
ii)sunlight is observe from solar energy
iii)optimum temperature
iv)water and mineral resources
v)chlorophyll is formed on the leaves
2aii)
Aim: To show than sunlight is necessary for photosynthesis
Material required: A potted plant, strip of black paper, clips, cupboard.
Method: The potted plant is first de-starched by putting it in a dark cupboard for 1-2days. this is to remove all traces of starch formed by leaves. After this, the middle of one of the leaves is covered by a strip of block paper, both of the front is then placed in sunlight. After about 3-5hours, the paper is removed. The leaf is then tested for starch
Observation: Only the exposed parts, i.e the top and bottom of the leaf turned blue-black with the iodine solution which shows the presence of starch while the area that was covered with black paper will remain colourless, indicating that starch is absent.
Conclusion: The experiment shows that sunlight is necessary for photosynthesis
2b)
micro nutrient necessary for plant growth are:
i)chlorine
ii)manganese
iii)Boron
iv)copper
v)zinc
macro nutrient are:
i)nitrogen
ii)phosphorus
iii)potasium
iv)magnesium
v)carbon
3ai)
A diet that contains the proper proportions of carbohydrates, fats, proteins, vitamins, minerals, and water necessary to maintain good health.
Or
3ai)balance diet is a food containing the correct proportion of all the six classes of nutrients,they are: carbohydrate,pro
tein,vitamin,fat & oil,mineral and water
3aii)
i)It provides energy required for normal activities
ii)Prevent malnutrition deficiency or diseases
iii)It encourages growth and normal development in the body
iv)It makes us healthy and by so doing makes us to resist diseases.
3b)
method 1:
rub the test substances on a paper or melt it on paper
result: the paper becomes translucent indicate presence of fat
method 2:
to the test substances, add a few drops of osmic acid.
Result is that there is brownish black coloration indicate the presence of fat
method 3:
to about 1cm^3 of milk in a test tube,add a few drops of sudan iv, the result is that the red colour is obtained
showing the presence of fat.
3ci)
-Maize weevil
-Beans weevil
-Cowpea weevil.
-Black citrus Aphid
-Bird
-Rat
-Stem piercing moth
-Variegated Grasshopper
-Cotton stainer
-Yam beetle
3cii)
Virus
-Rosette disease groundnut.
-Cassava mosaic
-bunchy top disease.
Bacteria
-Leaf blight of cassava.
-Black arm(bacterial blight of cotton)
5a)
-in complex multicellular organism, many cells are situated far away from others, hence substance have to be moved over greater distance.
-the surface are to volume ratio(Sa/v) in complex multicellular organism is too small, hence the need for an efficient transport system
-conducting or linking system becomes necessary to connect isolated groups of cells
-diffusion alone cannot be used for transport of materials to isolated cells
-materials being transported are large in quantity for simple precess of diffusion, osmosis or active transport to accomplish. hence the need for an efficient transport system in higher organism
5b)
DIAGRAM
use my obj
COMPLETED
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