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100% Real Biology Practical Answer Waec Gce Available Here....
Author: Mr. Dan
Posted on: 04:18:24 Tue, 04 Sep 2018


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*BIOLOGY-PRACTICALS*

2ai)
A Sex male
B Sex female
2aii)
A - Because is a sperm cell tum
Because D is an enoumerom
2b)
The letter X between cliedram A and B
represent mating (crossbreeding)
2bi)
- testis
- Sperm Cell
- Union
- Zygote
2cii)
i)Because it whene Sperm Cell Que formeel
ii) because it has head and tail on for movement
iii) Because the sperm colegg fuse together
iv) it is the product of the Union
2d)
The process is meiotic twisiors
=========================================
4a)
Vertical section of a human skin
4b)
i- hair shaft
ii- sebaceous gland
iii- erector muscle
iv- sweat gland
vi- blood vessel
vii- fatty cells
viii- cold sense receptor
ix- dermis
x- epidermis
4b)
i) excretion
II) maintenance of a suitable constant body temperature
iii) storage of reserved food
iv) protection
v) osmoregulation
4c)
low - constricts
high - contracts
4d)
VI) transfers oxygen and nutrients to the skin
VIII) responsible for sensitivity of the skin to light
X) provide a water proof Barrie' and create our skin tone
4e)
i) hot day
-vasodilatation
-sweating and cooling
-skin relaxation
ii)Cold day
-vasoconstriction
-Erector muscle contract
-skin assume erect position with trapped in between
4f)
victim D
4g)
i)bathing with soap and water
ii)exposure to fresh air
iii)check up on disease break out
iv)exposure to sunlight

4d)
ii - sebaceous gland secrete oily substance which lubricates the hair and keep it flexible

iii - it's concern with temperature regulation

v - it absorb waste products

vi - supply food and oxygen to the tissues of the skin

viii - sensitive to cold

x - it protects the underlying layer from excessive harmful radiation of the sun

1a)
Digestive system
1aii)
A- large intestine
B- liver
C- gall bladder
D- stomach
E- small intestine
F- pancreas
1aiii)
I- colon
II- rectum
III- anus
IV- appendix
1b)
Spec A
i)has large lumen
ii)short in lent
iii)has appendix
Spec B
i)has small lumen
ii)long in lent
iii)has no appendix
1bii)
Organ|Secretion
B |Bile
D |Gastric juice
E |Intestinal juice
F |Pancreatic juice
1c)
i) Liver
ii) When glucose is in excess in the blood, it is converted to glycogen
1d)
i) Pancreas
ii) Insulin
1e)
Appendix
1f)
i) Small intestine
ii) Large intestine
iii) Liver
iv) Stomach

2e)
i)ovaries
ii)testes
2fi)
The animal A and B that shows dominant character for skin colour is A
2fii)
Because all the Fi generation where hetrozygote skin colours of A.
2g)
i)
The genotype of animal A is BB while the genotype of animal B is bb.
ii) The phenotypic ratio of Fi generation is 4:0
2h)
i)body shape
ii)shape of head
iii)production of described traits
iv)height


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