WAEC 2017 BIOLOGY ANSWERS
BIOLOGY OBJ:
1-10: ABDBCDCBBD
11-20: CDBDCBBABA
21-30: CBCCDBCDDC
31-40: CBAADCCABA
41-50: CABADDDBDC
(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
(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
(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)Unicellularalgae
(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