Waec Gce Biology
.
(1ai)
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
.
(1bi)
A:
(i) Large in size
(ii) Rough surface
.
B:
(i) Small in size
(i) Smooth surface
.
(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
.
(2ai)
A – Male
B – female
.
(2aii)
A – Because E is a sperm cell from A
B – Because D is an egg(ovum) from B
.
(2b)
The letter X between diagram A and B
represent mating (cross breeding)
.
(2ci)
I – Testis
II – Sperm Cell
III – Union
IV – Zygote
.
(2ci)
I – Because it where sperm Cell are formed
II – Because it has head and tail region for movement
III – Because the sperm and egg fuse together
IV – It is the product of the union
.
(2d)
The process is meiotic division
.
(4a) Vertical section of a human skin
(b)
(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 – transfer oxygen and nutrients to the skin
Vii – responsible for sencesitivity at the skin to light
Viii -Provides a water prof barries and create our skin tone
(e) hot day:
=> vasodilation
=> sweating and cooling
=> skin relaxation
(II) cold day:
=> vasaconstrition
=> erector muscle contract
=> skin assume ereat protection one trapped in between
(f) vitamin D
(g)
– Bathing with soap and water
– Exposure to fresh air
– Exposure to sunlight
– Check up on disease break out
