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WAEC 2017 BIOLOGY OBJ & ESSAY ANSWER / SUBSCRIPTION



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  • WAEC 2017 BIOLOGY OBJ & ESSAY ANSWER / SUBSCRIPTION bio-

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    Section B Answer 3 Only================================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 growthii)Iron—}Yellowing of leaves and poor growth

    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

    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)Chalaza6

    ci)autotrophs are organisms that can synthesizes food from inorganic substances by using chemical energy orlight

    6cii)i)Bacteriaii)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 melaninii)It has sweat poresiii)Does not show photosynthesis

    iv)It composes of animal cells

    v)It is touch receptive-Plant epidermis-

    i)It has chlorophyllii)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

    Posted by OGA EASYNET on 21.04 22:54 Reply




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