===Biology-OBJ===
1_dcdacaccdc
11)ccbdadbbcd
21)dcbdddbacb
31)cdabbbbddb
41)dbcaabadbc
===============
1 a i
i- free living
ii - As filament
iii - As colony
=======
1a ii
i- Amoeba
ii - spirogyre
iii -volvox
1b.
1c i
Plant cells
* has chloroplast
* has a large vacoule
*has a cell centrioles
* has definities shape
Animal cell
* has no cloroplast
* has a small vacoule
*has centrioles
* has no definite shape
__________________________
2a.
The alimentary canal includes the
mouth, pharynx, esophagus, stomach,
small intestine, large intestine, and
anus. See digestion.
(2bi)
TABULATE
Alimentary canal of birds|Alimentary
canal of man -There is presence of
crop|Crop absent
-There is presence of proventiculus|
Proventiculus absent
-There is presence of gizzard|Gizzard is
absent (2bii)
-Both have caecum
-Both have Oesophagus
-Both have duodenum (2c)
Herbivore posses heterodant type of
dentition in which they posses teeth of
different shapes and sizes.Herbivores
feed mainly on vegetable hence its
teeth
is 28 in numbers.Its incisors are flat
with sharp cutting edges for cutting
vegetables or grasses .canine is
absent.the space creates due to
absense
of the canine is called diastema.
Diastema allows manipulation of
grasses
in the mouth.It has a very large molar
and premolar closely packed and have
very large ridged surface area for
cutting
and grinding 2d)
-They help in regulation of blood sugar
by
producing insuling and glucagon
-They help in digestion

3ai
A habitat is an ecological or
environmental area that is inhabited by
a particular species of animal, plant, or
other type of organism.
The term typically refers to the zone in
which the organism lives and where it
can find food, shelter, protection and
mates for reproduction, utilizing the
qualities the species has adapted to
survive within the ecology of the
habitat. It is the natural environment in
which an organism lives, or the
physical environment that surrounds a
species population.
A habitat is made up of physical factors
such as soil, moisture, range of
temperature, and availability of light as
well as biotic factors such as the
availability of food and the presence of
predators.
A habitat is not necessarily a
geographic area—for a parasitic
organism it is the body of its host, part
of the host's body such as the digestive
tract, or a cell within the host's body.
_____________________________________________
____
3bi
What is bacteriophage
a virus which parasitizes a bacterium
by infecting it and reproducing inside
it.
=========OR===========
(3ai)
A habitat comprises of an organism
immediate environment or where it
lives
or resides
(3aii)
-They help in the decay of the
organisms
-They also help to return certain
substances like gases eg Nitrogen to
the
atmosphere thereby regulating certain
biological processes such as the
Nitrogen
cycle,carbon cycle
-Some of the substances released are
important in processes such as
respiration,photosynthesis
(3b)
Energy flows basically from the
producers in a fresh water habitat to
the
consumers.The producers usually are
phytoplanktons which are taken up by
the primary consumers usually small
fishes. The primary consumer are taken
up by
the secondary consumers which are
larger fishes such as sharks.This sharks
may inturn be taken up by man which
is
the tertiary consumer
SCHEMATIC DIAGRAM
Phytoplanktons->Small fishes->Sharks-
>Man
(3c)
-They causes diseases such as rice
smut,black pod of cocoa which may
lead
to waste
-They also reduce the economic value
of
plants leading to financial loss
(3cii)
-They help in fermentation of certain
substances like yughourt eg
lactobacillus
species
-They help in decomposition and decay
of
substances eg sprophytic micro
organism
-They causes diseases eg smallpox and
chicken pox hence have been useful
tools
in the development of antibiotics and
vaccines
-They are useful in certain biological
processes eg photosynthesis
-They are used in sewage treatment
-Sources of enzymes
6d)
-High temperature affect evaporation
and reduces performance
-High temperature may lead to seed
dormancy
-It leads to loss of soil nutrients
through evaporation
-It affects the ripening and maturity of
plant
-it is necessary for germination of
seeds
6ei)
Courtship behaviour refers to the
instructive behaviour on response to
certain external stimuli in animals.It is
the pattern of behaviour that preceeds
mating and reproduction in animals.It
is performed by male and female
organism
6eii)
-pairing
-Teritoriality
-Display
6f)
-Holozoic nutrition
-Amoeba
-Entamoeba histolytica
-Humans
6g)
Crime detection using finger print
method: this applies to forensic.In this
method,individuals having different
finger print pattern can be identified
using database of stored information
of such individuals.These method
correctly identifies such individuals
aptly and is useful in crime detection
============9) i) Single independent free living
organism. Eg. Amoeba
ii) As a colony. Eg. Volvox
iii) As a filament. Eg. Spirogyra
i) Amoeba
ii) Volvox
iii) Spirogyra
C)Plant cell
i) They are rectangular in shape
ii) They contain chloroplast
iii) The contain cell wall
iv) The nucleus is at the side
Animal Cell
i) They are spherical in shape
ii) They do not contain chloroplast
iii) They do not contain cell wall
iv) The nucleus is in the middle
II) i) They both contain nucleus
ii) They both have mitochondria
iii) They both have endoplasmic
reticulum
6a)
-Tactic movement movement is found
in some plant and animals while
nastic movement is found in plants
alone
-Tactic movement rsponse to
directional stimuli while nastic
movement respond to non directional
stimuli
6bi)
-Euglena
-Chlamydomonas
6bii)
-Mimosa plant
-Sunflower
6ci)
-Regular cleaning
-Exposure to fresh air
-Eating balanced diet
-Regular exercise
6cii)
-Temperature
-pressure
-Pain
-Cold

Thank's for read our article WAEC 2016/2017 (BIOLOGY OBJ ,THEORY AND ESSAY) QUESTIONS AND ANSWERS
Created at 2016-04-19 14:07:01
Tags: 2016 , 2017 , answers , Biology , essay , obj , questions , THEORY , Waec

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