BIOLOGY ESSAY AND OBJ EXPO

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2019 WAEC GCE BIOLOGY ANSWERS
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BIOLOGY OBJ
1-10: BACCCBBACA
11-20: BAABCBBBAA
21-30: ADDAAACDAA
31-40: BADADDBCBB
41-50: CBDACDCABA
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Essay

(1a)
Osmosis is defined as the flow of water or solvent molecules from a region of dilute or a weaker solution to a region of concentrated or stronger solution through a selectively or differentially permeable membrane

(1bi)
Draw the experiment
[CLICK HERE]

(1bii)
The sugar solution in cavity of yam will remain the same. Therefore osmosis will not take place

(1biii)
Osmosis did not occur because the semi permeable membrane of yam cells was destroyed by boiling which did not allow movement of water into the solute (sugar) molecules

(1c)
(i) Potato
(ii) cocoyam
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(2a)
TABULATE
Food substances|Two test reagents
Reducing sugar|Fehling's solution and benedict solution
Protein|Biuret solution and Million's solution
Fats and oil|Sudan(III) solution and

(2b)
TABULATE
Digestive enzyme|Location of production of enzyme|Site of action
Maltase|Small intestine(Ileum)|Walls of small intestine
Lipase|Duodenum|Liver
Sucrase|Small intestine(ileum)|Walls of small intestine
Amylase|Ileum or duodenum|Liver

(2ci)
Get a fresh leaf
-Wash in a clean water
-Boil in warm/hot water to soften it
-Put in alcohol to kill the cells and to remove the cholorophyll, thus the leaf is destarched

(2cii)
The starch is converted to simple sugars or simple carbohydrates|glucose

(2di)
To kill the protoplasm

(2dii)
To remove chlorophyll

(2diii)
To soften it
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(6a) A Biennial plant is a flowering plant that takes two years to complete its biological life cycle
A Perennial plant is a plant that lives more than two years

(6b)
Characteristics of Carnivorous Plants

(PICK 4)
-Nitrogen Deficiency. -Carnivorous plants are found in soil lacking necessary nutrients such as nitrogen
-Attractants Animal prey is attracted to carnivorous plants through a variety of attractants that play on animals' senses
-Inescapable Traps
-Digestive Enzymes and Organisms
-Wet Site Inhabitants

(6c)
TABLATE
Type of Germination | Two example each
(1) Hypogeal germination | (i) Groundnut (ii) Wheat

(2)Epigeal germination | (i) bean (ii) tamarind
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