Important Posts

NECO 2017 - BIOLOGY OBJ AND ESSAY ANSWERS

Get Waec Gce Expo Here

NECO - BIOLOGY ANSWERS

================================

Exam Time: Wednesday 19th July 2017
OBJ & Essay – Biology – 10am – 12:30pm
===================


============================
COMPLETED
============================

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


BIOLOGY THEORY ANSWERS
(Answer only THREE questions)


(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

===========================================

(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

===============================================



(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 falls

=======================================


(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)
Mutations 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 tourism
(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

================================================


(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)pneumonia 

(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)radicle appear and grows download into the soil 
(iv)plumule appears and grows upwards through the soil until it reaches the surface.




+++++++++++++++++++++++++++++
COMPLETED
+++++++++++++++++++++++++++++


Get Waec Gce Expo Here
THERE IS LOVE IN SHARING! :

No comments:

Post a Comment

Designed by NAIRACODED MEDIA.