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Biology (Essay & Objective) Waec 2017 Free Expo Answers

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BIOLOGY OBJ:
BIOLOGY OBJ:
1-10: ABDBCDCABD
11-20: CDDDCDBABA
21-30: CACCADCDDC
31-40: CBAADADABA
41-50: CBBDCDDBAC

BIOLOGY THEORY ANSWERS:
(1ai)
Classifications of living things consists of placing together in categories those living things that resembles each other. It involves placing living things into groups that have certain features in common which distinguish them from other groups

(1aii) Car von Linnè Also known as Carolus Linnaeus

(1aiii)
-Classification is important because it allows scientists to identify the organisms
-Classification is important because it makes it easy for scientists to group the organisms.
-It is also good to properly name organisms via a standardized system

(1aiv)
-Kingdom
– Phylum(Animal) or division (Plant)
-Class
-Order
-Family
-Genus
-Species

(1bi)
-Vírus can reproduce when present in another living cell
-It possesses characteristics which can be transmitted from one generation to the next

(1bii)
-When a virus is extracted from a living cell and placed in a non living medium, it assumes a crystalline form and thus become non-living
-Virus cannot respire, excrete or respond to stimuli

(1ci)
-Rosette disease
-Cassava mosaic disease

(1cii)
-Chicken Pox
-Polio

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

(2a)
-They are protein in nature
-They are specific in action
-They are affected by pH
-They are usually involved in revesible reaction
-They accelerate rate of chemical reaction

(2bi)
-Amylase
-Lipase
-Trypsin

(2bii)
-AMYLASE-starch
-LIPASE-fats and oil
-TRYPSIN-proteins and peptones

(2biii)
STARCH=maltose
PROTEIN=polypeptides
FAT AND OIL=fatty acids and glycerol

(2ci)
It helps to trap the energy in sunlight for the photolysis of water in photosynthesis

(2cii)
-magnessium
-Iron
-nitrogen

(2ciii)
-Magnessium-yellowing of leaves
-Iron-leaf chlorosis
-Nitogen-yellowing of leaves

(2d)
-boil the leave to kill the leaves,inactivate the enzymes and burst starch grains.
-Dry in 70% alcohol to decolourise the leave
-Dry the leaf in hot water to soften it
-place on a whole tile and add few drop of iodine solution
-the leave turns blue-black if starch is present

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

(6a)
-The odour diffuse in air and it is inhaled into the nose.
-The mucus helps dissolve the odour and it excites the sensory receptor in the nose
-The impulse is carried to the olfacory lobes of the brain where the message is interpreted

(6b)
(i) Airspace-it is found in between the outer and inner membraned .it is imortant for respiratio
(ii)yolk- it supplied nutrients the embryo
(iii)chalaza- it hold the yolk and embryo in position within the alburnen
(iv)membranes-the membranes protect the egg
(v)shell- it protects and aids respiration because it is porous
(vi)albumen-it is rich in protein for the nourishment of the embryo

(6ci)
An autotroph or producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions

(6d)
Functions of WHO:
-Providing leadership on matters critical to health and engaging in partnerships where joint action is needed
-Shaping the research agenda and stimulating the generation, translation and dissemination of valuable knowledge
-setting norms and standards and promoting and monitoring their implementation
-Articulating ethical and evidence-based policy options
-Providing technical support, catalysing change, and building sustainable institutional capacity
-Monitoring the health situation and addressing health trends

(6e)
Plants:
(i) Spirogyra
(ii) water weed

Animals:
(i) protozoa
(ii) tilapia fish

(6f) 
Tabulate:
Skin of mammal:
-Epidemis is multi-layered
-Waterproof
-Opeque

Epidemis of leaf:
-Epidemis is single layered
-Forous water can seep through
-Transparent

(6gi) 
Plot A: Since the maize are all same species equal competitions of nutrients would take place

(6gii)
Plot B: They are of different species so the maize will highly compete with the pepper on nutrient and sunlight

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