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Welcome To Da' Technology Blog 2016/2017 Weac Answers Page.
2016/2017 WAEC Biology (Essay and objective) Answers.
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OBJ ANSWERS
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1_10 dcdacaccdc
11-20 ccbdadbbcd
21-30 dcbdddbacb
31-40 cdabbbbddb
41-50 dbcaabadbc
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1 a i
i- free living
ii – As filament
iii – As colony
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1ai)
i- free living
ii – As filament
iii – As colony
1aii)
i- Amoeba
ii – spirogyre
iii -volvox
1b.) Diagram
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
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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.
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=============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
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(2a)
Mouth,Oesophagus,Stomach,Duodenum,Small
intestine,Caecum,Appendix,Large
intestine,Rectum,Anus
(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
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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
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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
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
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