NECO 2018 BIOLOGY OBJ &THEORY EXPO -EXAMWAVES

NECO 2018 BiOLOGY ANSWERS



BIOLOGY OBJ:
1-10: BBEADBEEEC
11-20: DADBDCDDDB
21-30: ADECBDADEC
31-40: DADAAAACBA
41-50: BCEABCCCDB
51-60: EABBDDCCBB
===================
1a)
I) Sunlight:- convert Co2 and water into carbohydrates when absorbed by chlorophyll
ii) Chlorophyll:- Traps, absorbs and capture light energy

b)
I) Humerus
ii) Radius
iii) Ulna
iv) Carpals
v) metacarpals

1c)
I) make tunnels in the soil, build and repair termite nest
ii) take care of the eggs and young termites
iii) collect food, feed the young termites as well as the king, queen and the soldiers.

1d)
An ecosystem is a community of living things in an environment, together with the non living part of the environment

1e) Diagram

(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

===================================================
3ai)
Diabetes mellitus
Gall stone
Cancer of the liver
Infective hepatitis

3aii)
Plant cell
i) presence of cell wall
ii) presence of chloroplast
iii) Presence of sparse cytoplasm
iv) presence of small vacuole
v) Absence of centrosome

Animal cell
i) Absence of cell wall
ii) Absence of chloroplasts
iii) Presence of dense cytoplasm
iv) Presence of small vacuole
v) Presence of Centrosome

3b) diagram

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

4ai) diffusion is defined as the process by which molecules or ion move from a region of high concentrations to a region of low concentration until they are evenly distributed

4aii) osmosis is defined as the process by which water molecules move from a region of dilute or wicker solution to stronger solution through a selectively or permeable membrane

4aiii) plasmolysis is defined as the outward movement or flow of water from a living cell when they are place in an hyoertonic solution

4bi)
 effect of over crowding are ;

Aggressive behavior

State of unrest

Decrease in reproductive ability

4bii)
conservation of wild life are;

Indiscriminate killing of wildlife should be discouraged

Deforestation which destroy the habitat of animal should be discouraged

Killing of young developing animals should be allow.