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Confirmed Free: Neco 2017
Biology Obj & Essay,
Questions And Answers Now
Available



2017 NECO Expo Runs, Questions and
Answers.
This great
opportunity to get grades like A’s, B’s
and
Minimum of Credit in this exam and be
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NECO BIOLOGY SOLUTION

1a)
Homeostasis is the maintenance of a fairly
constant internal environment despite the
changes in the external environment. Eg Am
Amoeba regulates the water content of its
protoplasm inorder to keep it at a fairly constant
level

1aii)
i)Auxins
ii)cytokinin

1aiii)
"Euglena " is regarded as an animal because
i)It feed on ready-made food
ii)It does not have a cellulose cell wall but has a
plasma membrane
" Euglena " is regarded as an plant because
i)It has a chloroplast
ii)It can manufacture it's food
1bi)
Factors that affect transportations are
i)Temperature
ii)humility

1bii)
DRAW (8-10cm long) of the image (eye) given
NOTE:YOU MUST LABEL ONE SIDE ONLY
(coming as image)


2bi)_*Carbon dioxide:* With the increase of CO in
air, rate of respiration decreases slightly.

*Temperature:* Below 20 C and above 45 C the
rate of respiration reduces. The optimum
temperature for respiration is 20 C – 45 C.

2bi)Difference Between Artery and Vein
Artery
1. Vessels which carry blood from the heart to
various body parts
2. Arteries carry oxygenated blood from the
heart except pulmonary artery
3. Arteries have thick elastic muscular walls
4. Valves are absent
5. Blood flows under high pressure
Vein
1. Vessels which carry blood from the various
body parts to the heart
2. Veins carry deoxygenated blood from the
various body parts except pulmonary vein
3. Veins have thin non elastic walls
4. Valves are present to prevent the backward
flow of blood
5. Blood flows under low pressure

2bii)
-Adenovirus
-Nephritis
-Alagille
-Amyloidosis


3ai) Enzyme : Proteins that speeds up the rate
of a chemical reaction in a living organism. An
enzyme acts as catalyst for specific chemical
reactions, converting a specific set of reactants
(called substrates) into specific products.
Without
enzymes , life as we know it would not exist.
II) cyclosis: the circulation of cytoplasm or cell
organelles, such as food vacuoles in some
protozoans
III) peristalsis: the progressive wave of
contraction and relaxation of a tubular muscular
system, especially the alimentary canal, by
which the contents are forced through the
system.

3bii) The dental formula for different species are
as follows where I = incisors, C = canines, P =
and M = molars :
Man (adult)
I - 2/2 C - 1/1 P - 2/2 M - 3/3 = 16 x 2 = 32

3cii) Main Functions Of Amniotic Fluid
Provides Mechanical Protection : One of the
main functions of amniotic fluid is to prevent
mechanical trauma to the fetus. It keeps the
growing fetus encased safely, acting as a shock
absorber of sorts. Amniotic fluid provides a well-
lubricated environment for the fetus to move
around in, thereby helping in bone growth and
strengthening.

Allows Development of Body Parts: Amniotic
fluid circulates freely within the womb, keeping
every part of the body lubricated. That allows for
the growth of the external body parts such as
fingers and toes and stops them from becoming
clumped together. It also helps in the
development of the lungs and the digestive
system.

Offers A Natural Immune System : Amniotic fluid
is a significant player in the baby’s natural
immune system. Many of the antimicrobial
substances that make up the natural immune
system of the baby can be found in amniotic
fluid. These antimicrobials protect the baby from
various bacteria, fungi, protozoa, and viruses


*4ai)*
Decomposers are organism that break down
complex organic molecules in dead plant and
animal materials in stage, into simple organic
molecules and finally into inorganic substances

*4aii)*
Habitat is a kind of place where an organism
lives in nature

*4aiii)*
Mutation is a permanent change in DNA
structure that may alter or destroy a given
character or give rise to a new character

*4bi)*
i)For torism
ii)For source of foreign exchange
iii)For source of energy

*4bii)*
i)Fission
ii)Budding
iii)Fragmentation

*4biii)*
Functions of blood
i)Transportation of digested food substance
ii)Transports oxygen
iii)Transports excretory products
iv)Distributes heat and equalizes body
temperature
v)destroys bacteria through blood corpuscles

*4biv)*
TABULATE

*SEXUAL REPRODUCTION*
i)often two parents needed
ii)Gametes produced
iii)Offsprings show new variation

*ASEXUAL REPRODUCTION*
i)only one parent needed
ii)No gametes
iii)Offsprings identical


5ai) primary successions :Primary succession is
one of two types of biological and ecological
succession of plant life, occurring in an
environment in which new substrate devoid of
vegetation and other organisms usually lacking
soil, such as a lava flow or area left from
retreated glacier, is deposited.
II) primary roots: The primary root is the central,
first-formed, main root . The primary root
originates at germination stage from the radicle
of the seed. During its growth it branches to
form the secondary Roots.
III) macronutrient: any of the nutritional
components of the diet that are required in
relatively large amounts: protein, carbohydrate,
fat, and the macrominerals.

5bi) Asthma.
Collapse of part or all of the lung (pneumothorax
or atelectasis)
Swelling and inflammation in the main passages
(bronchial tubes) that carry air to the lungs
(bronchitis)
COPD (chronic obstructive pulmonary disease)

II) 1 . Air
Air is a major source of pathogens.For example
when a person having common cold snezzes the
pathogens enter air and when inhaled they cause
common cold to another healthy person.Thus we
should ensure good air circulation in our homes
,schools or public places to control pathogens.
2. Water
Water is also a major cause of
diseases.Tharefore we should ensure that we
schould have clean boiled water or should have
aquaguarrd in our homes.
3.Sterlization
It destructs pathogens in medical and lab rooms
.We sterlize equipments by heating , freezing or
by use of radiation.
4. By use of chemicals
We use chemicals like alcohol to kill pathogens

III) - On the species level, variation allows a
population to maintain a healthy diversity,
allowing it to cope with changing circumstances.
- Variation within a population is beneficial to the
species as a whole due to subtle or dramatic
changes in the environment. If changes do occur
in the environment, those with variation which
favors the new conditions will live to pass on
those genes which do well in the new
environment.
- It helps in maintaining life even in adverse
conditions, as some individuals having variation
can even survive in adverse environment. So,
natural selection will result in survival of the
species having variation which makes it better
than others.

5c) Plants reproduce using eggs and sperm, just
like people. However, they don't have physical
sex! Male plants release pollen , which fertilize
ovaries . The fertilized ovaries develop into
seeds , which can then be distributed to make
new plants. As the fertilized ovaries develop, a
surplus of carbohydrates and proteins are stored
inside the seed. This will serve as food for the
plant until it can develop leaves. Next, the
fertilized plant ovaries develop the hardened
coat we see as the outside of seeds to protect
them against harsh environmental conditions.
The seeds then can be carried away by wind or
animals to create new plants.
The hard outer covering of seeds protects them
until germination

*Seed Germination*
After the seed has made it to a new location and
is covered with dirt, it can begin germination.
Germination is the process of seeds developing
into new plants. First, environmental conditions
must trigger the seed to grow. Usually, this is
determined by how deep the seed is planted,
water availability, and temperature. When water
is plentiful, the seed fills with water in a process
called imbibition . The water activates special
proteins, called
enzymes , that begin the process of seed
growth. First the seed grows a root to access
water underground. Next, the shoots , or growth
above ground, begin to appear. The seed sends a
shoot towards the surface, where it will grow
leaves to harvest energy from the sun. The
leaves continue to grow towards the light source
in a process called
photomorphogenesis

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