NECO Biology OBJ, ESSAY/Theory Questions and Answer – May/June 2017 Expo Runz
Biology OBJ:
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BIOLOGY-THeory
INSTRUCTION: Answer Three(3) Questions Only.
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-
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-
i)It has a chloroplast
ii)It can manufacture it’s food
1bi)
i)Temperature
ii)humility
1bii)
2ai)
Beak- is used to pick up food such as grains and fruits
2aii)
Crop- the food is stored temporarily in the crop where it moistened and fermented
2aiii)
Gizard- the grinding of the food takes place at the gizard with the aid of small stones
2aiv)
Liver- helps in breaking down fat from food
2bi)
-Artery-
i)Vessels which carry blood from the heart to various body parts
ii)Arteries carry oxygenated blood from the heart except pulmonary artery
iii)Arteries have thick elastic muscular walls
iv)Valves are absent
-Vein-
i)Vessels which carry blood from the various body parts to the heart
ii)Veins carry deoxygenated blood from the various body parts except pulmonary vein
iii)Veins have thin non elastic walls
iv)Valves are present to prevent the backward flow of blood
2bii)
-Adenovirus
-Nephritis
-Amyloidosis
2biii)
i)Providing leadership on matters critical to health and engaging in partnerships where joint action is needed;
ii)Shaping the research agenda and stimulating the generation, translation and dissemination of valuable knowledge;
iii)Setting norms and standards and promoting and monitoring their implementation;
iv)Articulating ethical and evidence-based policy options;
v)Providing technical support, catalysing change, and building sustainable institutional capacity
3ai)
enzymes is a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical 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)
i)Yankari Game Reserve – Bauchi
ii)Borgu Game Reserve – kano
iii)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
i)The outer layer of the fruit is the exocarp, and the outer layer of the seed is the testa.
ii)Fruit contain high amounts of moisture while seed contain low amounts of moisture
iii)Fruit undergoes a ripening process while seed does not undergoes a ripening process
iv)after fertilization, the ovary convert into Fruit while after fertilization, the ovule convert into seed
3cii)
i)The fluid allows the baby to move around while it is developing. This movement allows for bone and muscle development.
ii)The fluid also helps to keep the fetus nice and warm by keeping heat in. It also helps to keep the temperature consistent.
iii)The fluid offers protection from any blows that may come to the uterus area. It may cushion the blow if the mother falls.
4ai)
Decomposer is an organism whose ecological function involves the recycling of nutrients by performing the natural process of decomposition as it feeds on dead or decaying organisms.
4aii)
Habitat is the place where an organism or a biological population normally lives or occurs
4aiii)
mutation is a permanent, heritable change in the nucleotide sequence in a gene or a chromosome; the process in which such a change occurs in a gene or in chromosome.
4bi)
i)To prevent destruction of natural environment or to allow for continued use of natural resources for man’s benefits
ii)To preserve rare and valuable species of plants and animals for the future generation or to save them from extinction or permanent destruction
iii)To preserve naturally beautiful scenarios for their aesthetic values
4bii)
i)Fission
ii)Budding
iii)Vegetative propagation
4biii)
i)Supplying oxygen to tissues (bound to hemoglobin, which is carried in red cells)
ii)Supplying nutrients such as glucose, amino acids, and fatty acids either dissolved in the blood or bound to plasma proteins (e.g., blood lipids)
iii)Removing waste such as carbon dioxide, urea, and lactic acid
iv)Regulating body pH
v)Regulating core body temper
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