B¡ology Nec0 2017 Answers

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B¡ology Nec0 2017 Answers



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Wednesday 19th July 2017
OBJ & Essay – Biology – 10am – 12:30pm
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BIOLOGY-OBJ
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*NECO 2017 BIOLOGY QUESTIONS*

DRAW A BETWEEN ARTERY AND VEIN. 2bi)Difference Between Artery and Vein
Artery
1. Vessels which carry blood from the heavrt to various body parts
2. Arteries carry oxygenated blood from the heart except pulmonary artery
3. Arteries have thick elastic muscular walls
4. Valves are absent
5. Blood flows under high pressure
Vein
1. Vessels which carry blood from the various body parts to the heart
2. Veins carry deoxygenated blood from the various body parts except pulmonary vein
3. Veins have thin non elastic walls
4. Valves are present to prevent the backward flow of blood
5. Blood flows under low pressure

2bii)
-Adenovirus
-Nephritis
-Alagille
-Amyloidosis


*4ai)*
Decomposers are organism that break down complex organic molecules in dead plant and animal materials in stage, into simple organic molecules and finally into inorganic substances

*4aii)*
Habitat is a kind of place where an organism lives in nature

*4aiii)*
Mutation is a permanent change in DNA structure that may alter or destroy a given character or give rise to a new character

*4bi)*
i)For torism
ii)For source of foreign exchange
iii)For source of energy

*4bii)*
i)Fission
ii)Budding
iii)Fragmentation

*4biii)*
Functions of blood
i)Transportation of digested food substance
ii)Transports oxygen
iii)Transports excretory products
iv)Distributes heat and equalizes body temperature
v)destroys bacteria through blood corpuscles

*4biv)*
TABULATE

*SEXUAL REPRODUCTION*
i)often two parents needed
ii)Gametes produced
iii)Offsprings show new variation

*ASEXUAL REPRODUCTION*
i)only one parent needed
ii)No gametes
iii)Offsprings identical



*5a)*
Primary succession is that which occurs in an area where no community existed before and involves the formation of new soil.it may begin from a bare dry environment or an aquatic environment

*5aii)*
Primary root is that which develop first and originates from the radicle of the seed of a plant. It is essential for the anchoring of the plant and ensure plant growth.it eventually develop into the tap root and fibrous root

*5aiii)*
Micronutrient is define as a class of chemical compound which is needed in largest amounts or quantities by organism. They are carbohydrates, protein and lipids

*5bi)*
i)Asthma
ii)lung cancer
iii)pneumomia

*5bii)*
i)Quarantining
ii)Prohibition
iii)Biological control
iv)chemical control

*5bii)*
i)variation aids crime detection
ii)Variation enable and assist in blood transfusion
iii)variation help in determination of the paternity of a child

*5biii)*
Seed germination
i)seed absorbs water and swell
ii)testa splits
iii)radicle appear and grows download into the soil
iv)plumule appears and grows upwards through the soil until it reaches the surface






















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BIOLOGY-OBJ
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21BBABCAADAB
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