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WAEC 2013 BIOLOGY EXPO (Theory and OBj)

Biology OBJ:

1-10: CBCADBADCC
11-20: ACDDCACCDB
21-30: DDCCABBCBB
31-40: DBCABABABC
41-50: CCBACDDBAA
51-60: BDCDCCADAC



Biology Essay

(2a)
photosynthesis is defined by which green plants manufacturing their food making use of water in the presence of sunlight.

(2b)(i)
-sunlight
-water availability
-carbon(iv) oxide
(ii)
chlorophyII content
(iii)water and oxygen gas

(2c) water and oxygen gas
-water react with carbon(iv)oxide ­ to give glucose
-oxygen is evolve to the surrounding and serve as source of air for animal

(2d)
there is no oxygen plant in lower depth of some lakes beacuse the oxygen content there is extremely low or even absent


(8b)
the kidney is supplied with blood vessels. the renal artery supply blood to the kidney while the renal vein takes awayblood from the kidney. a long narrow tube called the ureter connects the kidney to the urinary bladder where urine is stored temporarily. the urinary bladder lead to the ureathra which opens to the evterior from which opens to the exterior from which urine is finally passed out.

(8c)
insect-malphigi ­an tubule
earthworm-flame ­ cell

(1aii)
Tabulate this plz:

Gaseous exchange:
It is the taking in of oxygen and giving out of carbondioxide,
It involves living cells,
It takes place at cell time, energy might not be release
Aerobic respiration:
It is the respiration that takes place in the pressure of oxygen,
It involves animal only, that can survive with oxygen,
It takes place in the presence of light
Energy is usually released.

(1b)residual air can be defined as the air that is found in the atmosphere. some of them are gotten from the activities that are been done on the surface of the earth.

(1bii)
it is used for breathing, it is used in combustion

(1c)
-Respiratory tract must be permeable
-it must have a large surface area
-it must be moist
-it must be vascularised

(1di)oxygen depth can be defined as the condition when there is lack of oxygen or insufficient amount of oxygen needed by a living organism

(1dii)
-excercise
-accident
-coma



(7) carbon cycle involves the
series of processes which
contribute to the circulation of
carbon in nature. In the carbon
cycle,carbondio ­ xide is
removed from the air by photosynthesis. ­ Carbon can be
lost inform of carbonates of
calcium & magnesium through
leaching and drainage. Burning
of fuel like coal add carbon to
the earth moisture. So also is the volcanic activities. On the
other hand, respiration add
CO2 by plant.

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