Bi0l0gy Waec 20I7 Exp0 Answers

By 03:48 Tue, 18 Apr 2017 Comments


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Wednesday, 19th April, 2017

Biology 2 (Essay) 2.00pm - 3.40pm

Biology 1 (Objective) 3.40pm - 4.30pm

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BIOLOGY OBJ:

1-10: ABDBCDCABD

11-20: CDDDCDBABA

21-30: CACCADCDDC

31-40: CBAADADABA

41-50: CBBDCDDBAC

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*WAEC 💯 VERIFIED BIOLOGY ANSWERS* 💯💯💯💯✅✅✅✅

*BIOLOGY 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

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2a)i They catalyse reactions by lowering the activation energy of a reaction

ii). They are regenerated after each reaction

iii). They are substrate specific, hence only molecules which are complementary to their shape can bind to it.

iii). They aid in metabolism (anabolism and catabolism)

2bi)-Pancreatic lipase

- Amylase

2bii)-Fats and oil

-Starch Maltose

2biii) -It converts fat and oils to fatty acids and glycerol

-It converts starch to maltose

2ci)Chlorophyll is necessary to absorb the radiant energy of the sun to synthesize sugar during photosynthesis

2cii)-Magnessium

-Iron

2ciii) Magnessium --->Yellowing of leaves and poor growth

-Iron--->Yellowing of leaves and poor growth

2d) *STEPS TO TEST PRESENCE OF STARCH IN THE LEAF*

1. Boil pieces of leaves in a beaker of water TO KILL THE CELLS AND BREAK THE WALL OF LEAF CELL

Fresh leaves

Boiling the leaves

2. Heat the pieces of leaf in alcohol for few minutes TO REMOVE CHLOROPHYLL

Alcohol turns to green color- chlorophyll is removed

3. Soak the pieces of leaf in hot water for a little while TO SOFTEN THE LEAF

4. Using a dropper, add a few drops of iodine solution onto the pieces of leaf TO TEST FOR STARCH

Finally, LEAVES THAT CONTAINS STARCH TURN TO DARK BLUE COLOUR

6a)

The odorous molecules come into contact with the olfactory epithelium at the top of the nasal cavity and stimulate multiple chemically cell receptors and thus the odour is transmitted to the brain. There after the brain interprets the type of smell.

6b)

i)Shell

ii)Membranes

iii)Airspace

iv)Albumen

v)Yolk

vi)Chalaza

6ci)

autotrophs are organisms that can synthesizes food from inorganic substances by using chemical energy or light

6cii)

i)Bacteria

ii)Unicellular algae

6d)

i)providing leadership on matters critical to health

ii)shaping the research agenda and stimulating the generation

iii)translation and dissemination of valuable knowledge

iv)setting norms and standards

v)promoting and monitoring their implementation

6e)

i)plants: Water Wisteria and Java Moss.

ii)Animals: catfish and earthworm

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I promise that Biology answers will come very early.

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