2018 Neco Biology Practical Questions And Answers.


2018/2019 Neco Biology Practical Questions and Answers, expo . 2018 Neco Biology Practical Expo , Questions and Answers, Real Expo . 2018 Neco Biology Practical confirmed/ Real Expo , Questions and Answers. 2018 Neco Verified /Real Biology Practical Questions and Answers. 2018 Neco Biology Practical Expo , Questions and answers.

(2a)
G – Coconut fruits.
H – Cashew fruits.
I – Tomato fruits.
J – Tridax fruits.

(2aii)
In a tabular form:
G | Wind | The flowers do not produce scent
H | Animal | Some flowers have coloured calyx
I | Animal | The flowers do not produce nectar
J | wind | It possesses honey guide

(2aiii)
In a tabular form
Under G:
-It has a based and stony endocarp.
-It undergoes marginal placentation.
-Coconut Fruit is dry indehiscent
-It has hard epicarp.

Under I:
-It has scattered scent.
-It undergoes axile placentation.
-Tomato is a dry dehiscent.
-It has a fleshy epicarp.

(2b)
Diagram

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(3ai)
Flamboyant flowers.

(3aii)
In a tabular form:
Under parts:
1. Filament.
2. Style.
3. Petals.
4. Sepal

Under Number:
1. 5
2. 1
3. 5
4. 5

(3aiii)
Filament – It is the male organ used in production.
Style – It is the female organ through which the gametes pass.
Petal – It produces sweet juices for the insects.

(3aiv)
Pollination.

(3av)
(i) It has nectary gland.
(ii) The anthers contains few pollen grains.
(iii) The stigma is lobbed with sticky surfaces for easy adherence of the pollen grain.

(3bi)
M – Tilapia fish.

(3bii)
Pisces.

(3biii)
-It is poikilothermic animal.
-It possess dorsal fin for swimming.
-The body is covered with overlapping scales.

==========================================

(1ai)
Specimen A – Elephant Grass.
Specimen B- Grasshopper
Specimen C- Lizard.
Specimen D – Housefly.

(1aii)
Specimen B – Insecta
Specimen C – Reptilia in the sub-phylum vertebrata.

(1aiii)
Specimen D
Houseflies serve as intermediate hosts for several parasitic worms Eg Round worms in their developmental stage.

(1aiv)
Specimen B:
(i) Has fore and hind wing for flight.
(ii) Has cuticle to minimize loss of water.
(iii) Has antenna for feeling.

Specimen C:
(i) limbs are developed for movement on land.
(ii) dry scaly skin to protect it from drying up.
(iii) its digits end in claws for grasping and climbing

(1av)
A (Elephant grass) -> B (grasshopper) -> C (Lizard)

(1bi)
Specimen E – Termite
Specimen F – Spider

(1bii)
Drawing

(1biii)
In a tabular form:
Under E
1. Possession of six walking legs.
2. Possession of three body segments.
3. Possession of thorax.
4. Absence of hairy body.

Under F:
1. Possession of eight walking legs
2. Possession of two body segments.
3. Absence of thorax.
4. Possession of hairy body.

2018 NABTEB Geography { Obj & Essay } Answers.

(1ai)
Migration is the movement of people from one geographical area to another involving permanent or temporary residence or settlement.

(1aii)
(i) Rural – urban migration
(ii) Rural – rural migration
(iii) Urban – rural migration
(iv) Urban – urban migration

(1b)
(1) Natural disaster: the occurrence of natural disaster like flood, drought, famine e.t.c could force people to migrate out of the trouble areas to a good peaceful place.
(2) Insecurity: fear of security arising from war, political instability e.t.c could make people to migrate
(3) Difference in economic opportunities: as a result of these people tend to migrate to where there are more economic opportunities like jobs and business transaction
(4) Changes in status: change in status eg high level of education and wealth could make people to migrate

(1c)
(i) It leads to unemployment
(ii) It leads to high cost of living

==========================================

(4i)
(1) Italy
(2) Germany

(4aii)
ITALY:
(i) Shoes
(ii) Wrist watch

GERMANY:
(i) Motor vehicle
(ii) Textile

(4aiii)
ITALY:
(i) Cocoa
(ii) Palm oil

GERMANY:
(i) Rubber
(ii) Crude oil

(4b)
(i) It foster international cooperation
(ii) It stimulates production of exportable goods
(iii) Provision of new product
(iv) Provision of foreign exchange
(v) Generation of revenue

(4c)
(1) Indefinite capital: indefinite capital among these three counties may limit the volume of trade among them
(2) Low demand for product
(3) Low value of currency
(4) High traffic on goods
(5) Strained international relations

==========================================

(5a)
DRAW THE DIAGRAM
(Map of Nigeria showing rivers, dams, seaport area, river port)

(5b)
(1) Medium of transportation: river, especially the large ones serve as medium of transportation from one place to another
(2) Generation of hydro-electric power (H.E.P) many rivers are dammed in areas of water fall and rapid for the purpose of generating electricity
(3) Regeneration and tourism: some rivers are centers of tourist attraction and may generate foreign exchange for s nation
(4) Domestic uses: water from rivers is used for various domestic purpose such as cooking, washing, bating and drinking

(5c)
(i) Seasonal fluctuation of the water volume
(ii) Rapid and falls on the rivers
(iii) Growth of water weeds
(iv) River pollution

==========================================

(8a)
DRAW THE DIAGRAM
Showing the map of Nigeria Plains and Basin

(8b)
NIGER – BENUE TROUGH

(8bii)
(i) Human and economic activities
(ii) Most of the resource are food crops like yam, cassava, rice, cocoyam, fish and H.E.P
(iii) The main economic activities include:
– Farming where yam, rice etc are grown
– Fishing is done due to presence of river Niger and Benue
– Industrial activities like mining (limestone) in Gboro and brass work in Bida

(ii)
PROBLEMS OF DEVELOPMENT:
(i) Poor transportation in the region
(ii) Presence of waterfall and rapid along the rivers
(iii) High level of tse-tse flies and black flies infestation which ones sleeping sickness and river blindness respectively
(iv) Seasonality of the rivers inhabits transportation

(8biii)
(i) The rivers should be dredged regularly
(ii) Social amenities should be provided
(iii) Waging war against tse-tse flies and black flies in the region

2018 NABTEB Chemistry { Obj & Theory } Answers.

Nabteb Chemistry Obj

1AADDDCACCC
11DAACAABCDC
21ABABDCDCAC
31BDCCADBBBA
41DCDBDDDBAB

==========================================

(1ai)
An element is a substance that cannot be split into simpler substances by any known chemical process.

(1aii)
Limestone ==> CaCo3
TABULATE
|Elements| Group|

UNDER ELEMENT:
(i) Calcium
(ii) Carbon
(iii) Oxygen

UNDER GROUP:
(i) II
(ii) IV
(iii) VI

(1bi)
Hund’s rule of maximum multiplicity states that every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied and all electrons in singly occupied orbitals have the same spin

(1bii)
Carbon = 1s2 2s2 2p2

(1ci)
The outermost electrons are found in 4s and 3orbitals

(1cii)
Transition elements

(1ciii)
(i) It has variable oxidation states
(ii) It forms complex ions
(iii) It forms coloured compounds
(iv) It serves as catalyst

(1d)
The atoms in iron has valency of 2 in the 4s the atoms in the iron bar contribute their valent electrons to form pool or sea of electron. The repulsive forces of the electrons is balance by the electron cloud. The nuclear force emanating from the nucleus helps to keep the electron cloud in the lattice.
Fe(s) ==> Fe2 + 2e-

==========================================

(2ai)
Electro negativity is the ability of an atom to attract electrons to itself when in a molecule

(2aii)
(i) P >AL>Na
(ii) P 284Th + 4He + Energy
(ii) 214Pb ==> 214B2 +s
(iii) 14N + 4He ==> 19O + P + energy

(2c)
Fraction left after 30 days = (1/2)n
N = 30days/10days = 3
Fraction left after 30days = (1/2)3
= 1/8
Mass left after 30days = 1/8 x 20
= 2.5g
Mass that decayed off = (20 – 2.5)g
= 17.5g

==========================================

(3ai)
Hygroscopy is the ability of a substance to absorb moisture from the atmosphere without dissolving in it to form a solution

(3aii)
(i) Conc H2SO4
(ii) Ethanol
(iii) Calcium oxide

(3bi)
M = I x t x m m/n x f
Ca + 2e- ==> Ca(s)
M = 10 x 3 x 60 x 40/2 x 96500
M = 72,000/193,400
M = 0.37g

(3bii)
TABULATE
||Electrolytic Cell || Electrochemical Cell|

UNDER ELECTROLYTIC CELL:
(i) It contains electrical energy chemical energy
(ii) The anode is positive while the cathode is negative

UNDER ELECTROCHEMICAL CELL:
(i) It convert chemical energy to electrical energy
(ii) The anode is negative electrode while the cathode is positive electrode

(3ci)
(i) Rhombic Sulphur
(ii) Monoclinic Sulphur

(3cii)
(1) It is used in industrial preparation of tetraoxosulphate (vi)

(2) It is used as fungicide

(3ciii)
H2S + Cl2 ==> 2HCL(g) + S(s)

(3civ)
(i) It is a reducing agent

(3v)
(i) Presence of air
(ii) Presence of moisture
(iii) Rusting can be prevented by coating the surface of the iron

==========================================

(4ai)
DRAW THE DIAGRAM
Hydrochloric acid is added to the zinc granules in the flask and the gas produce is collected by downward displacement of air of water.
Zn(s) + 2HCL(aq) ==> Zncl2(aq) + H2(g)

(4aii)
TWO PHYSICAL PROPERTIES:
(i) It is colorless, odourless gas
(ii) It is neutral to litmus paper

TWO CHEMICAL PROPERTIES:
(i) It reacts with metal to form hydride
2Na + H2 ==> 2NaH
(ii) It burns in air to produce steam
2H2 + O2 ==> 2H2O

(4aiii)
(i) 3H ==> Trictium

(4b)
Permanent hardness of water is a water that contain dissolve MgSO4 or CaSO4 which makes it not to lather readily with soap

(4bii)
(i) MgSO4 ==> Magnessium tetraoxosulphate (vi)
(ii) CaSO4 ==> Calcium tetraoxosulphate (vi)

(4biii)
ADVATAGES:
(i) It makes to have taste
(ii) It helps to build strong bones and teeth

DISADVATAGES:
(i) It leads to wastage of soap
(ii) It cause fuming of kettles and boilers

(4biv)
Add a few drops of water to white anhydrous copper (ii) tetraoxosulphate (vi) it turns the salt blue

(4v)
(i) The state of matter of both the reactants and the products
(ii) The volume of reactants and products it gaseous
(iii) The reactant and the products involved

==========================================

(5ai)
Homologous series is a family of organic compounds which follow a regular structure pattern in which each successive member differs in its molecular formula by a – CH2 group

(5aii)
(i) Successive members differ by –CH2
(ii) Members can be prepared by the same general methods
(iii) They have general formula

(5aiii)
H H CH3 H H
H – C – C – C – C – H
H H H CH3
2,3 – dimethylpentane

(5bi)
(i) Heat
(ii) Catalyst

(5bii)
C10H22 ==> C5H12 + C5H10
C5H10 ==> Pentene

(5c)
H H H H H H
H – C – C – C – C – C – H
H H H OH H

Pentan – 2 – 01

(5cii)
RCOOR2

(5ciii)
CH3CH2CH2COOH + CH3OH
CH3CH2CH2COOCH3
Methylbutanoate

2018 NABTEB Agric { Obj & Theory } Answers.

NABTEB AGRICULTURE SCIENCE

AGRICULTURE OBJ
1-10 ABADDABABB
11-20 BABCDDCAAD
21-30 ABADDBBBAB
31-40 CCBBDDDAAC
41-50 AAABDCDAAA
=========================

(1)
(i) Animal science
(ii) Veterinary science
(iii) Soil science
(iv) Crop production

(a) Animal science:
(i) It ensures the efficient and effective management of farm animals
(ii) It ensures a better animal productivity
(iii) It helps to ensure meat and egg production

(b) Veterinary medicine:
(i) It provides a better health management for farm animals
(ii) It ensures the control of pest and parents of farm animals

(c) Soil Science:
(i) It ensures the maintenance of soil fertility
(ii) It aids better soil classification and mapping

(d) Crop production:
(i) It helps in effective crop management practices
(ii) It ensures optimum plant population

==========================================

(2ai)
(i) small farm holding, land fragmentation or land tenure system does not permit mechanization
(ii) There are no access roads for machines
(iii) It is costly or expensive to hire machines and most farmers are poor
(iv) High running cost for machinery discourages mechanization
(v) There is inadequate farm laboures of farm hands to enhance mechanization
(vi) Unfavorable soil terrain or topography prevent mechanization

(2bi)
(i) It is mostly practiced by peasant farmers
(ii) It involves small portion of land
(iii) There is no specializations
(iv)The returns or output are usually very low
(v) It usually involves family labour

(2bii)
(i) It involves the use of hired labour
(ii) Records are kept
(iii) Yield or output is usually high
(iv) It involves huge investment of money or capture
(v) It involves the cultivation of large hectares of lard

==========================================

(3a)
(i) Unpredictable breeding behavior or rabbits
(ii) Inadequate sanitation and proper
(iii) it is labour intensive
(iv) lack of capital impedes large investment in rabbitry
(v) inadequate supply and high cost of concentrates feeds
(vi) high nest box mortality of litters

(3b)
(i) coccidiosis
(ii) enteritis
(iii) ear canker
(iv) ringworm

(3bii)
(i) passing of soft faces which may be blood stained
(ii) high temperature
(iii) brown scab inside the auditory canal
(iv) circumscribed lesions on skin

(3biii)
(i) treatment of sick animals with coccidiostate
(ii) appy appropriate drugs (antibiotics)
(iii) use of miticides
(iv) use of fungicide to cure lesions

==========================================

(5)
(a) land may be defined as the uppermost layer of the earth crust in which Agriculture and non – Agriculture activities are carried out. It is also the solid part of the earth surface which has as its components water, air, soil, rock, minerals, nature vegetation and animal of life and it is suitable for agriculture production

(5b)
– Agriculture land example are:
(i) land for crop production
(ii) livestock production

– Non – Agriculture land example are:
(i)industrial or factory use
(ii) mining

==========================================

(6a)
Weathering is defined as the gradual breaking down or disintegation of rocks by either physical (mechanical) or chemical process.

(6b)
(i) physical or mechanical weathering
(ii) chemical weathering
(iii) biology weathering

(6ci)
Physical Weathering:
(i)wind: The force of wind carries along small pieces of soil which hit against the surface of parent rock causing it to disintegrate into smaller soil particles.
(ii)water: Moving water or rain has a grinding effect against the surface of the parent rock. This causes the rock to disintegrate into smaller soil particles.
(iii)man activities: moving activities or rain has a grinding effect against the surface of the parent rock. This causes the rock to disintegrate into smaller soil particles.

(6cii)
Chemical Weathering:
(i)hydration: Soluble minerals in the rocks absorb water and expand weakening rock structures The rock becomes porous and eventually disintegrates into smaller soil particles
(ii)hydrolysis: Water reacting with soluble minerals in the rocks loosening and breaking them into smaller particles.
(iii)Oxidation: Reaction of rock minerals with oxygen to form oxide compounds which easily break up.

2018 NABTEB Biology Practical Answers.

NABTEB BIOLOGY PRACTICAL

(1a) Chloroplast aids the manufacture of food (photosynthesis in green plants

(1b) mitochondria is the site for respiration ie it helps to break down food into simple sugar

(1ii)
(i) Prophase
(ii) Metaphase
(iii) Anaphase
(iv) Telophase

(1iii) viruses are regarded as non-living organisms because they are inert outside the host body.

(1iv) PICK TWO
(i) Tongue
(ii) Noise
(iii) Eye
(iv) Skin
(v) Ear

(1v) PICK TWO
(i) Kidney
(ii) Lungs
(iii) Skin
(iv) Liver

(1vi) PICK TWO
(i) Hyper myopia (long-sightedness)
(ii) Myopia (short sightedness )
(iii) Presbyopia
(iv) Astigmatism

(1b) PICK ONE
(i) Night blindness
(ii) Reduced resistance to diseases

(1vii) PICK ONE
(i) Cowpea
(ii) Groundnut
(iii) Melon

(1viii)
– xylem: it helps to conduct water and dissolved mineral salt from the roots to the leaves. – Phloem: it helps in storage of food

(1ix)
(a) Diploid number of cells (2 offspring)
(b) Haploid number of cells (4 offspring)

(1x)
– Tadpole ==> kidney
– Catfish ==> kidney

(1xi)
– Incomplete metamorphosis
– Complete metamorphosis

(1xii)
(a) Baobab tree ==> arid area (terrestrial)
(b) Rock mangrove tree ==> estuarine

(1xiii)
(a) White blood cell: it helps to defend the body against disease by ingesting the bacteria and virus that causes disease
(b) Red blood: it helps to transport oxygen from the lungs to the body cells

(1xiv)
(a) Sweat gland: it helps to remove sweat from the body
(b) Blood plasma: it helps to transport the substances that are dissolved in it as well as the cells that float in it.

(1xv) PICK TWO
(i) Fossil records
(ii) Evidence from comparative anatomy
(iii) Evidence from geographical distribution
(iv) Evidence from embryology
(v) Evidence from vestigial organs

(2)
A ==> bean seed
B ==> maize grain
D ==> tilapia fish

(2ii)
C ==> terrestrial habitat
D ==> aquatic habitat

(2iii)
A ==> explosive mechanism
B ==> wind

(2b) DRAW THE DIAGRAM

(3a)
E ==> butterfly
F ==> grasshopper
G ==> cockroach
H ==> housefly

(3ii)
E ==> it aids pollination
F ==> it destroy leaves of plants
G ==> it helps in the spread of disease
H ==> it helps in the decomposition of substance

(3iii)
E ==> sand dunes
F ==> leaves of plants
G ==> dark cupboard
H ==> manure and decomposing material

(3b) TABULATE
Specimen: | E | F | G | H |
Class: |insecta | insect | insect | insect|
Phylum: | Arthropoda | | Arthropoda | | Arthropoda | | Arthropoda |

(4ai)
A ==> net venation
B ==> parallel venation

(4aii)
– SPECIMEN C
(i) presence of dry skin covered with scales
(ii) presence of hind and fore limbs for locomotion
(iii) presence of buccal cavity for feeding

(4aiii)
SPECIMEN D
(i) Presence of scale on skins
(ii) Presence of lateral lines
(iii) Presence of fins for movement
(iv) Fore limbs and hind limbs for movement
(v) Mouth for feeding
(vi) Lateral for detecting of vibration

(4b)
TABUALTE
Specimen: | Economic importance | type
E | aids pollination | complete
F | destroys leaves | incomplete
G | spreads disease | incomplete
H | decoys of substance | complete

(5a)
TABULATE
S/N | Ecological Instrument | Use|
1 | thermometer | to measure temperature
2 | hygrometer | to measure relative humidity
3 | barometer | to measure pressure
4 | pooter | collection of insect
5 | Quadrant | to study plants population
6| rainguage | to measure amount of rainfall

(5b)
PICK THREE
BIOTIC FACTOR
(i) Competition
(ii) Parasitism
(iii) Predation
(iv) Pathogens
(v) Mortality
(vi) Migration
(vii) Food

ABIOTIC FACTORS
PICK THREE
(i) Edaphic factors
(ii) Chemical factors
(iii) Climatic factors
(iv) Topographic factors

(5c) Grass ==> Rat ==> Snake