2017/2018 NECO RUNS EXPO: BIOLOGY THEORY AND OBJ QUESTION AND ANSWERS

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BIOLOGY OBJ:
1-10: DADEAABCAA
11-20: ECEBBAADBC
21-30: BBABCAADAB
31-40 BACCCABEED
41-50: DABCABCAAE
51-60: AEEABAEBDE

THEORY:
INSTRUCTION:ANSWER ONLY 3 QUESTIONS
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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)

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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

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5a)
Primary succession is that which occurs in an area where no community existed before and involves the formation of new soil.it may begin from a bare dry environment or an aquatic environment

5aii)
Primary root is that which develop first and originates from the radicle of the seed of a plant. It is essential for the anchoring of the plant and ensure plant growth.it eventually develop into the tap root and fibrous root

5aiii)
Micronutrient is define as a class of chemical compound which is needed in largest amounts or quantities by organism. They are carbohydrates, protein and lipids

5bi)
i)Asthma
ii)lung cancer
iii)pneumomia

5bii)
i)Quarantining
ii)Prohibition
iii)Biological control
iv)chemical control

5biii)
(i)variation aids crime detection
(ii)Variation enable and assist in blood transfusion
(iii)variation help in determination of the paternity of a child

5c)
Seed Germination
i)seed absorbs water and swell
ii)Testa splits
iii)redicle appears and grows downwards into the soil
iv)plumule appears and grows upwards through the soil until it reaches the surface

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3ai)
Enzymes are organic catalyst which are usually protenious in nature that speeds up the rate of a chemical reaction in a living organism and they remain chemically unchanged at the end of the reaction

(3aii )
Cyclosis is a regular cyclic movement of protoplasm within a cell. It is the circulation of cytoplasm or cell organelles , such as food vacuoles in some protozoans

(3aiii )
peristalsis is the involuntary constriction and relaxation of the muscles of the intestine or another canal , creating wavelike movements that push the contents of the canal forward

(3bi )
-Yankari Game Reserve – Bauchi
-Borgu Game Reserve – kano
-Okwangwo Game Reserve – Cross River

(3bii)
I = incisors,C = canines,P = premolars,M = molars
For adult man it is
I:2 / 2,C:1/ 1,P:2/ 2,M:3/ 3
= 16 x 2 = 32

(3ci )
TABULATE
-The outer layer of the fruit is the exocarp while the outer layer of the seed is the testa
-Fruit contain high amounts of moisture while seed contain low amounts of moisture
-Fruit undergoes a ripening process while seed does not undergoes a ripening process
-after fertilization , the ovary convert into Fruit while after fertilization , the ovule convert into seed

(3cii )
-The fluid allows the baby to move around while it is developing . This movement allows for bone and muscle development
-The fluid also helps to keep the fetus nice and warm by keeping heat in . It also helps to keep the temperature consistent
-The fluid offers protection from any blows that may come to the uterus area – It may cushion the blow if the mother fall

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(2a)
-Beak: for picking food substances eg grains worms
-Crop: functions as chamber where food is temporarily stored
-Gizzard: connects crop with intestine and for grinding food into small particles by churning action
-Liver: secretes bile, prepares fat, deanimation of proteins etc

(2bi)
-arteries carry blood away from heart except pulmonary artery while veins carry blood to the heart
-arteries carry blood under high pressure while veins carry blood under low pressure
-presence of valves while vein absence of valves
-presence of pulse while vein absence of pulse

(2bii)
-Nephritis
-Oedema
-Diuresis
-Kidney stones

(2biii)
-they ensure proper environmental sanitation
-they provide drugs / vaccine
-they establish quarantine section
-they render health services to people
-they give health standards


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