Waec 2016 Biology Obj And Theory Answers

-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
-Mimosa plant
-Regular cleaning
-Exposure to fresh air
-Eating balanced diet
-Regular exercise
-High temperature affect evaporation and reduces
-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
-Holozoic nutrition
-Entamoeba histolytica
(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

-Single/independent free living organism eg amoeba
-As a colony eg volvox
-As a filament
eg spirogyra
-Plant cell are rectangular in shape while Animal cell are
spherical in shape
-Plant cell contain chloroplast while animal cell do not
contain chloroplast
-Plant cell contain cell wall while animal cell do not
contain cell wall
-Plant cell nucleus is at the side while the animal cell is
at the middle
-They both have nucleus
-They both have mitochondrion

-They both have endoplasmic reticulum

(3ai) A habitat comprises of an organism immediate
environment or where it lives or resides
-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
Phytoplanktons->Small fishes->Sharks->Man
-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
-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
-They are used in sewage treatment
-Sources of enzymes
(2a) Mouth,Oesophagus,Stomach,Duodenum,Small
intestine,Caecum,Appendix,Large intestine,Rectum,Anus
Alimentary canal of birds | Alimentary canal of man
-There is presence of crop | Crop absent
-There is presence of proventiculus | Proventiculus
-There is presence of gizzard | Gizzard is absent
-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
-They help in regulation of blood sugar by producing
insuling and glucagon
-They help in digestion


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