NABTEB GCE 2017/2018 BIOLOGY EXPO OBJ AND ESSAY QUESTIONS AND ANSWERS

2017 NABTEB GCE BIOLOGY OBJ AND THEORY QUESTIONS AND ANSWERS SOLUTIONS – Nov/Dec Expo

 

 

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Exam Time: Mon 28th Nov 2017
BIOLOGY (Obj and Essay)
9:00am-11:00am

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NABTEB GCE BIOLOGY OBJ AND THEORY ANSWERS FROM EXAMCLASS.NET

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BIOLOGY OBJ:

1-10: BDCAABCCBC
11-20: DDBAAD-BAC
21-30: ADDAABBACB
31-40: DCDDDCBADB
41-50: BBAADBBCCD

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BIOLOGY THEORY:
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(1ai)
-As independent or free living eg paramecium,Euglena,chlamydomonas
-As colony eg volvox,sponges
-As filaments eg oscillateria
-Cells as part of living organism eg man

(1aii)
Advantages:
-It has a longer lifespan
-It performs more function than unicellular organism
Disadvantages:
-Needs to eat more than a unicellular organism because it needs more energy
-The cells are organised into tissue,tissues are organised into organs so if one organs fails the whole organism fails

(1bi)
-Virus is a living organism
-Virus can reproduce when present in another living cell
-It posesses characteristics which can be transmitted from one generation to the next

(1bii)
DRAW THE DIAGRAM

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(2ai)
-Carbon(iv)oxide
-Water and mineral salts
-Sunlight
-Chlorophyll
-Optimum temperature

(2aii)
Aim:To show that light is necessary for photosynthesis
Materials required:A potted plant,strip of black paper,clips,cupboard
Method:The potted plant is first de-starched by putting it in dark cupboard for 1-2 days this is to remove all traces of starch formed in the leaves.After this,the middle the middle of one of the leaves is covered by a strip of black paper,both at the front and back with the aid of clips.The whole plant is then placed in sunlight .After about 3-5hours,the paper is removed.The leaf is then tested for starch.
Observation:Only the exposed part ie the top and the bottom of the leaf turned blue-black with the iodine solution which shows the presence of starch while the area that is covered with the black paper will remain colourless,indicating starch is absent.
Conclusion:The experiment shows that light is necessary for photosynthesis

(2b)
Micro nutirients: zinc,copper,boron,molybdenum,cobalt,chlorine,manganese
Macro nutrients: Nitrogen,phosophorus,potassium,calcium,oxygen,carbon,iron,sulphur

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(3ai)
Balance diet is the diet containing the correct proportion or the right amount of all the six classes of food required by an organism or man

(3aii)
-Balanced diet makes us healthy so doing makes us to be resistant to diseases
-it provides required energy for normal activities
-It encourages growth and normal development of the body

(3b)
Test: Grind your groungnut seeds and put it in a test tube.Add about 1cm^3 of ethanol in the test tube and shake.Add equal amount of water and shake again
Observation: A clearly emulsion is formed
Inference:Fat is present

(3ci)
Insects,rodents,man,Nematodes,birds,monkeys

(3cii)
-Rosette disease of groundnut
-Cassava mosaic
-Leaf blight of cassava

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(4a)
DRAW THE DIAGRAM

(4b)
When nerve impulse reaches the end of an axon,the synaptic knobs at the tips of the end-plate fibres secretes a chemical substance called acetylcholine.This difusses across the synaptic gap and stimulates the dendrites of the post synaptic neurone.The second neurone then continues the transmission of impulse.An enzyme called choline terase renders the acetycholine inactive thereby preventing it from accumulating synaptic gap

 

 

 

 

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