WAEC 2017 Biology Obj And Theory/Essay Answer – May/June Expo

Verified WAEC Biology Essay/Theory and OBJ Questions and Answer Solution – May/June 2017 Real, Confirmed and Correct Expo Runs

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Biology Obj:

1ABDBCDCBBD

11CDBDCBBABA

21CBCCDBCDDC

31CBAADCCABA

41CABADDDBDC

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1ai)

Classification of living things is the way in which all living things are placed into larger and larger groups or catetories that share similarities and a common ancestry.

1aii)

Carl Linnaeus

1aiii)

i)It allows scientists to identify, group, and properly name organisms via a standardized system

ii)to make it easier to study and understand their behaviors,

iii)To study evolutionary progression of millions of life forms

1aiv)

i)Kingdoms

ii)Phylum

iii)Classes

iv)Order

v)Families

vi)Genus

vii)Species

1bi)

i)they can reproduce

ii)they can mutate

1bii)

i)they do not carry out metabolism on their own hence they do not grow

ii)they contain no cytoplasm or cellular organelles

1ci)

i)mosaic disease of cassava

ii)swollen shoot disease of cocoa

1cii)

i)human immunodeficiency virus (HIV)

ii)measles

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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.

iv)They aid in metabolism(anabolism and catabolism)

2bi)

-Pancreatic lipase

-Amylase

2bii)

i)maltae act

ii)lipase act

2bii)

i)it converts fat and oil to fatty acids and glycerol

ii)it converts starch to maltose

2ci)

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

2cii)

i)Magnessium

ii)Iron

2ciii)

i)Magnessium —}Yellowing of leaves and poor growth

ii)Iron—}Yellowing of leaves and poor growth

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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

6f)

In tabular form

-Mammalian skin-

i)It has melanin

ii)It has sweat pores

iii)Does not show photosynthesis

iv)It composes of animal cells

v)It is touch receptive

-Plant epidermis-

i)It has chlorophyll

ii)It has stomata

iii)It shows photosynthesis

iv)It is composed of plant cells

v)It is not touch receptive

6gi)

i)Intra specific competition

6gii)

i)Inter specific competition

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