2018 NECO BIOLOGY ANSWERS

WELCOME TO MR STEVOSTINE EXAM FORUM

BIOLOGY ANSWERS

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1-10: BBEADBEEEC

11-20: DADBDCDDDB

21-30: ADECBDADEC

31-40: DADAAAACBA

41-50: BCEABCCCDB

51-60: EABBDDCCBB

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(1a)

(i) Sunlight: It is source of energy for during photosynthesis

(ii) Chlorophyl: It traps solar energy and coverts it to chemical energy during photosynthesis  

(1b) 

(i) Humerus

(ii) Radius

(iii) Ulna

(iv) Scapula

(v) The ball and socket joint 

(1c)  

(i) They help in gathering food for the caste

(ii) circulating and maintaining the colony’s pheromones and food among each other via trophallaxis, 

(iii) They help in tending to the eggs and nymphs

(iv) They help in taking care of the queen and king

(v) They help in constructing or repairing the nest, tunnels, galleries, feeding tunnels

(1d) 

Ecosystem is a community of interaction between organisms and their environment.

(1e) 

DRAWING

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(2ai)

Gene can be defined as the basic unit of iheritance which carries hereditary factors or materials such DNA. It is found in the chromosone of all cells

(2aii)

Implantation refers specifically to the attachment of the fertilized egg to the uterine lining, which occurs approximately 6 or 7 days after conception (fertilization).

(2aiii)

Group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

(2aiv)

A saprophytes are organism which feeds on dead decayed organic matter.

(2bi) 

(i)It gives support and shape to the body

(ii) It helps in the production of white blood cells 

(iii) It aids free movements 

(iv) It helps in the attachment of muscles

(2bii)

(i) Biceps

(ii) Triceps

(2biii)

(i) Lipase

(ii) Maltase

(iii) Amylase

FUNCTION:

-Lipase breaks down dietary fats into smaller molecules called fatty acids and glycerol. 

-Maltase converts maltose to glucose

-Amylase converts starch to maltose

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3ai) 3 diseases of liver are ;

Diabetes mellitus 

Gall stone

Cancer of the liver 

Infective hepatitis

3aii) in tabular form, give five difference between plant cell and animal cell

*(check solution below)*

3b) loading.....

3ci) type of supporting tissue in plant;

Parenchyma 

Collenchyma 

3cii)give two characteristics of reptile;

They are poikilothermic animals 

They have dry skin covered with scales 

They do not show parental care 

They have lungs which are used for gaseous exchange

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(4ai)

Diffusion is the movement of (molecules atoms ions) from a region in which they are in higher concentration until an equilibrium is established

(4ai)

Osmosis this is a spontaneous movement of water molecules through a semi-permeable membrane into a region of higher solute concentration

(4aii) 

Plasmolysis this is a shrinking away of protoplam linear from a cell wall of a paintor bacterium due to water loss from osmosis

(4b)

(i) lack of sleep

(ii) lack of privacy

(iii) poor hygiene

(iv) lost if physical contact

(4bii)

(I)prevention of pollution to prevent the destruction of aquatic life

(ii)prohibition of killing or poaching of animals in game reserve

(4biii)

(I)dog

(ii)horse

(4ci)

Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. 

(4cii)

(i)cockroaches 

(ii)termites

(4ciii)

(i)Tomatoes 

(ii)Oranges

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