2019 NECO EXPO BIOLOGY OBJ & THEORY QUESTIONS AND ANSWERS

NECO 2019 BIOLOGY OBJ AND THEORY ANSWERS FROM EXAMCLASS.NET
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BIOLOGY OBJ
1-10: EDBABEBAEA
11-20: EACDABAAED
21-30: ACBDBDEACE
31-40: DACBEABBAD
41-50: BADDDDBCAD
51-60: BDAEBCBACA

 

 

BIOLOGY THEORY
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(1a)
(i) A habitat is an ecological or environmental area that is inhabited by a particular species of animal, plant or other type of organism. It is the natural environment in which an organism lives, or the physical environment that surrounds a species population.

(ii) temperature is an objective measurement of how hot or cold an object is. It can be measured with a thermometer or a calorimeter. It is a means of determining the internal energy contained within a given system.

(iii) population can be define as all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.

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(2ai)
Light reaction stage occurs during the day or in the presence of light. The light energy or solar energy is captured by chlorophyll and electrons are excited. The energy trapped is used to split water into hydrogen ion(H+) and hydroxyl ion (OH-). The splitting if water into hydrogen ion(H+) and hydroxyl ion(OH-) is called photolysis of water.
The photolysis of water is represented by this equation:
4H2O light 4H+ + 4(OH)
The hydroxyl ion is converted into water :
4(OH) —> 2H2O + O2

During this process, oxygen is given out as a by product as shown in the chemical equation above. At the same time, a compound, co-enzyme or NADP is reduced by hydrogen ion to NADPH and Air.

(2aii)
The muscle that contracts to cause the joint to straighten is called extension. When one muscle is contracted, the other muscle from the other pair is always elongated. The biceps and triceps muscles work together to allow bending and straightening of the arm.

(2bi)
(i) Baking of bread.
(ii) Formation of acid.
(iii) Formation of diary product.

(2bii)
(i) Production of honey eg bees
(ii) Pollinating crop we use for food.
(iii) Some are scavengers and prevent decay.
(iv) Production of silk.
(v) Human food is spiked by cockroaches, ants and flies.

(2biii)
(i) Both has Ribosome.
(ii) Both has hybosomes.
(iii) Both has Nucleolus.
(iv) Both has Mitochondria and Golgi bodies.

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(3a)
(i) Bones are rigid, non-flexible, and tough, whereas cartilage is flexible and are soft-elastic.
(ii) Bones grow in both directions (bidirectional) while cartilage grows in the single direction (unidirectional).
(iii) Bones cells are also known as Osteocytes while cartilage cells are also known as Chondrocytes.
(iv) Bones are active participants of blood supply; Cartilage are not the participants in blood supply, except in perichondrium.

(3aii)
(i) Hydrostatic skeleton
(ii) Exoskeleton
(iii) Endoskeleton.

(3bi)

Drawing

(3bii)
– Parenchyma
– Collenchyma
– Sclerenchyma
– Xylem
– Phloem

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(4ai)
Tabulate

-Enzyme:
(i)Ptyalin
(ii)Pepsin
(iii)Lactose

-Source:
(i)Saliva
(ii)Gastric acid
(iii)Intestinal juice

-Site of action:
(i)Mouth
(ii)Stomach
(iii)Small intestine

-Substrate:
(i)Starch
(ii)Protein
(iii)Lactose

(4aii)
(i) Saprophyte nutrition
(ii) parasitic nutrition
(iii) holozoic nutrition

(4aiii)
(i) Mosquito
(ii) housefly
(iii) tse-tse fly

(4b)
Drawing

 

 

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(5ai)
Commensalism is a type of relationship between two living organisms in which one organism benefits from the other without harming it.

(5aii)
(i) Remoras and shark
(ii) Oyster and crab

(5aiii)
(i)trapping or water storage in tanks or wells
(ii)treatment and recycling of used water
(iii)tree planting to reduce evaporation

(5aiv)
(i) For asupport
(ii) For absorption of water and dissolved mineral salt by the plant
(iii) for food storage

(5bi)
Conservation is define as the preservation of natural resources from waist or exploitation through rational use and to ensure their continued use or availability of the resources

(5bii)
(i)chemical waist should be discharged into air
(ii)industries should be sited far away from residential area
(iii)legislation should be made against indiscriminate burning

(5biii)
Tabulate:

(i) Pollutant
-sulphur dioxide
-Nitrogen oxide
-Pesticides

(ii)Source
-From coal and oil that are burnt
-is produced from automobile
-From chemical that are used to kill from chemical that are used to kill or control pests

(iii)Effect
-it causes acidic rain
-it leads children morality and toxic to adults
-it affects soil conservation

 

 

 

 

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