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BIOLOGY (OBJ And ESSAY) Waec GCE 2016 Free Expo Answers




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Friday , 2nd September, 2016
Biology (Essay& Obj) 9.30am -12.0
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ENGLISH LANGUAGE Waec GCE 2016 Free Expo Answers (ESSAY|OBJ|ORAL)


WAEC GCE 2016 BIOLOGY ANSWERS
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BIOLOGY OBJ:
1-10: ABBCCCDCCA
11-20: AABAADBDBC
21-30: BAAAADCCBC
31-40: CDADCCCBBB
41-50: CACAAABCAC



1a)Plants take in some compounds like carbon dioxide through their leaves. They absorb some other materials such as compounds of nitrogen, phosphorus, etc., from the soil through their roots.
the transport system consists of tube like passages made up of vascular tissue. There are two types of vascular tissues in plants—xylem and phloem.
The vascular wapbase.org system extends from the roots through the stem and continues up to the leaves. In the leaves it is clearly seen as a pattern of veins. Water and minerals are transported from the roots upwards through the xylem tubes.
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(2ai)
Enzymes are organic catalyst which speed up the rate of chemical reaction but remain chemically unchanged at the end of the reaction

(2aii)
-They are protenious in nature
-They are specific in nature
-They are usually involved in reversible reactions
-They are PH dependent
-They are temperature dependent
-They remain chemically unchanged at the end f the reaction

(2b)
Pancreatic juice contains erepsin,maltase,sucrase and lactase
-Erepsin converts polypeptides to amino acids
-Maltase converts maltose to two glucose
-Sucrase converts sucrose to glucose and fructose
-Lactase converts lactose to glucose and galactose

(2c)
The casts act as mould for setting the fractured bone,milk is rich in proteins ad vitamins is good for growth while sun helps to synthesize vitamin D which aids bone formation

(2d)
-Provision of food
-Recycling of nutrients
-provision of oxygen
-Removal of pollution
-It serves as building block for other substance
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(3ai)
-Virus
-Bacteria
-Protozoan

(3aii)
Bacteria eg Staphlococcus aqreus
-Fungi eg Rhizopus nigricans
-Virus eg Influenza virus

(3aiii)
-By sterilization
-Use of antibiotics
-Hygenic and sanitary practices
-Use of chemotherapy

(3b)
-Salinity
-Oxygen
-Temperature
-Turbidity

(3ci)
-Bush burning
-Continous cropping
-Overgrazing

(3cii)
-Loss of medicinal benefits of extinct species
-Disease invasion
-Scarcity of product of extincted species
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(4ai)
DRAW THE DIAGRAM

(4aii)
DRAW THE DIAGRAM
1 is homozygous starchy grain
2 are heterozygous starchy
1 is homozygous sugary grain

(4b)
-Starchy=3/4*500
=435 starchy grains
-Sugary =1/4*500
=145 sugary grains






(6a)
This i the ability of an organism to immitate other organism that either has an unfabvourable characteristics

(6aii)
Camouflage is a concealing colouration which matches the colour of the background

(6b)
-It is dark in colour
-It as an antennae
-It has wings

(6c)
It reduces the market value of plants
-It reduces the tyield of plants
-It reduces the nutient value of plants

(6d)
-Refrigerating
-Smoking
-Drying
-Salting

(6e)
-For paternity detection
-For crime detection

(6f)
-Inadequate space
-Inadequate light
-Inadequate water
-Inadequate nutrient

(6g)
It is a long term gradual series of changes occuring in structure,composition,variety and number of species in an area till a stable community is reached

(6h)
-It reduces soil fertility
-It reduces soil micro organism
-It causes soil leaching
-It reduces soil aeration

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BIOLOGY OBJ:
1-10: ABBCCCDCCA
11-20: AABAADBDBC
21-30: BAAAADCCBC
31-40: CDADCCCBBB
41-50: CACAAABCAC




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