Nabteb 2016 EXPO : Verified Biology (Essay and Obj) Questions And Answers

Nabteb 2016 EXPO : Verified Biology (Essay and Obj) Questions And Answers
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Today
Monday 23rd May 2016
Biology (Essay and Obj) 9:00am-11:20am
Commerce (Obj and Essay)

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1a)
draw it 10cm-12cm long
1bi)
i)it is microscopic in nature
ii)it does not respire,teed
iii)it has either RNA or DNA
iv)it can not reproduce by bnary fission
1bii)
i)yellow fever
ii)AIDs
iii)measles
iv)small pox
v)chicken pox
vi)influenza

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2ai)
photosynthesis is defined as the process by which
green plants manufacture their food making use of
carbondioxide and water in the presence of
sunlight
2aii)
i)production of food
ii)relese of oxygen to the environment
iii)it furify the atmosphere
iv)it serve as building blocks for other substances
2b)
i)they have small inconspicious petals
ii)they usually dull colloured
iii)there is absence of sient
iv)there is absence of nector
2c)
i)berry eg tomatoes
ii)drupe eg mango
iii)carryopsis eg rice
iv)cypsela eg iridax fruit
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3a)
i)nitrogen—stunted growth
ii)mepnessium—yellowing of leave
iii)phosphorus—poor growth

3b)
i)they help in the decomposition of dead plant and
animals there by releasing nutrient to soil
ii)they aerate the soil i.e they allow air to the soil
iii)they aid in compost formation
iv)they release nutrient into soil

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3ci)
manure is an organic matter mostly derived from
animal F@ces except in the case of pre
manure,which can be use aso organic fertilizer in
operation of farm/food

3cii)
i)it provides nutrient for plants and black in colour
ii)it increase the ability of soil to retain water and
the have for micro-organisms
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4ai)
dentition can be define as the number,arragement
and conformation of teeth in an organism

4aii)
i)incisors
ii)canines
iii)premolars
iv)molars

4bi)
hormcae is an oragnic chemicals or biochemical
substance produce in a minute quantities in one
part of an organism and transported to the sate of
action where they exoct specific effect to control
body metabolism

4bii)
i)adrenalin-it increase sugar content of the blood
ii)oestrogen-it stimulates uterus growth and breast
development
iii)oxytocin-it controls the flow of milk in the
mammary glands
iv)thyroxine-it repulates the rate of metabolism
especially respiration
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5a)
i)red blood cells
ii)whit blood cells
iii)blood platelet
iv)plasma

5aii)
i)platelets plugs are formed due to exposure of
damaged blood vesssels to air
ii)the platelets release a chemical which causes
involuntry muscles in the wall of the damaged
blood vessels to contrict and so reducing blood
flow
iii)the enzyme thrombokinase converts an inactive
prothrombin into thrombin(enzyme)
iv)the thrombin is converts fibrinogen into fibrin
v)the fibrin form a mesh of fine thread which traps
blood cells forming a clot that covers the wound
vi)the mesh of fibrin blocks the cut in the blood
vessel and prevents futher bleeding

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5aii)
i)it prevent further loss of blood
ii)it prevent the entry of pathogenic organisms at
the point of the wound or injury

5bi)
food preservation is refers to any one of number of
techniques used to prevent food from spoiling for
future use

5bii)
i)by freezing
ii)by salting
iii)by smoking
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6a)
i)alleles:there pairs of genes on the position of a
chromosome that controls contrasting character
ii)phenotype:this is the sum total of all observable
features of an organism i.e the
physical,physiological and be havioural traits
iii)genotype:this is used to describe those traits or
sum total of the genes inherited from both parents
i.e it includes both the dominant and the recessive
traits
6b)
i)food chain:this is defined as a feeding
relationship involving the transfer of energy
through food from producers to consumers.
ii)food web:this is defined as a complex feeding
relationship among organism in the same
environment with two or more inter-related food
chains

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6c)
maize(producer)——–>locust(primary consumers)
——–>lizard(secondary consumers)——–>snake
——–>hawk(tertiary consumers)

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Chinonso Ibeh
About Chinonso Ibeh 2921 Articles
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