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 BIOLOGY-PRACTICALS
1a)
I- petal
Ii- ovule
Iii- ovary
Iv- filament
V- anther
Vi- stigma
1aii)
Longitudinal section
1bi)
i)Anther
ii)filament
1bii)
i)ovary
ii)stigma
iii)ovule
1c)
I) petal attract insect which pollinate flowers
II)ovule produce the female Genets,develop into seed
III)anther contain the pollen grains
IV)stigma receive the pollen grains at pollination
1di)
E – Marginal placentation
F – Axile placentation
G – Parietal placentation
H – Free central placentation.
1dii)
E – They are arranged in a single row.
F – They are divided into chambers.
G – The placenta occurs at the edge.
H – The placenta occurs freely in the centre.
1diii)
E – Delonix Regia.
F – Tomato.
G – Paw-Paw
H – coconut

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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
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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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)
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
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

Completed

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