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WAEC 2017 Biology Theory and Obj Answers

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WAEC 2017 Biology Theory and Obj Answers by : 6:12 pm On April 18, 2017

WAEC 2017 Biology Theory and Obj Answers

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Theory Answers
No 4 diagram

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)
Function 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

4a)draw the diagram between mother and father,under it write their possible blood group of the father are blood group A,Bor O
4bi)
-Adaptive colouration
-Adaptive behaviour
4bii)
-in order to invite are another for food or mate
-in order to alert or prevent one another against threat to life.

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12 comments

  1. tunde says:

    Pls biology answer , both essay and objective

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  2. tunde says:

    Pls I need biology answer , both essay and objective

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