NECO BIOLOGY ESSAY SOLUTIONS

NUMBER ONE

a (i) the cell Theory state that all living things are made up of a cell which is the structural and functional unit of life. That new cells arise from pre-existing cells by cell division.

Ii.

  • Robert Hooke
  • Matthias schleiden

b (i)

  • The flowers are large
  • Possesses nectar
  • The flowers are brightly coloured to attract insects pollination.
  • Its pollen grains are heavy and sticky.

ii.

  • Ginger – by rhizome
  • Banana – by sucker
  • Sweet Potato – by tuber

c. When bread is ingested in the mouth, batang mixes it with saliva which contains ptyalin converting it into maltose. It enters the muscular chamber the stomach, it is churned and retained for three to four hours. It then passes to the small intestine where it is acted upon by amylopsin to complete breakdown to maltose and alkaline, intestinal juice that break down maltose to glucose. The glucose is absorbed and transported by capillaries to the liver which processes it. Undigested food passes to the large intestine where water is absorbed and makes the wastes to become semi solids called faeces. The faces then pass into the rectum and out of the body via the anus.

NUMBER FOUR

(4ai)
(PICK ANY THREE)
(i) The crops with tap roots should be followed by those with fibrous root system.
(ii) Selection of the crop should be demand based.
(iii) The selection of crops should be problem based.
(iv) The selection of crops should suit to the farmer’s financial conditions.
(v) More exhaustive crops should be followed by less exhaustive crops.
(vi) The crops selected should also suit to the soil and climate conditions.
(vi) The crops selected should also suit to the soil and climate conditions.

(4aii)
(PICK ANY FIVE)
(i) The presence of thick, waxy cuticles on leaves:
(ii) Stomata present in the upper epidermis only:
(iii) Shrinking of hinge cells when flaccid:
(iv) Flashy succulent leaves:
(v) Have reduced number of stomata:
(vi) Sunken stomata or presence of crypts and leaf surface covered with fine hairs.
(vii) Closed stomata in the presence of light and opened stomata in the absence of light:
(viii) Leaves are reduced to spines, needles, or scales and they are folded or rolled when flaccid

(4bi)
(i) Feathers : Feathers are modified scales that provide insulation and enable flight in birds. Some fossil reptiles, such as Archaeopteryx and Microraptor, also had feathers, suggesting that they were an ancestral trait that evolved before the divergence of birds and reptiles.
(ii) Bones : Birds have hollow bones that reduce their weight and enhance their flight ability. Some fossil reptiles, such as Coelophysis and Pterosaurs, also had hollow bones, indicating that they were an adaptation to a fast and agile lifestyle.
(iii) Eggs : Birds lay hard-shelled eggs that protect their embryos from dehydration and predation. Reptiles also lay hard-shelled eggs, implying that they share a common reproductive strategy that originated in their ancient ancestors.

(4bii)
(PICK ANY FIVE)
(i) Regulates amino acids.
((ii) Regulates blood clothing
(iii) Stores Vitamins and Minerals.
(iv) Processes glucose
(v) Filters blood
(vi) Bile production
(vii) Albumin production
(viii) Resists infections.

(4c)
(PICK ANY FOUR)
(i) Reforestation.
(ii) Afforestation
(iii) Protect Existing Forests.
(iv) Sustained Yield Method.
(v) Produce Less Waste
(vi) Monitor Agriculture
(vii) Planned and Regulated Tree-cutting
(viii) Laws and Rules Help Prevent Deforestation.

(5bi)
(PICK ANY TWO)
(i) Calyx protects the flowers in bud condition from the outer injury.
(ii) The calyxes are usually green in colour, but sometimes, it may be coloured as petalloid, which attract insects and helps in pollination.
(iii) In certain cases, calyx develop spur and can store nectar and helps in seed dispersal.

(5bii)
(PICK ANY FIVE)
(i) Testosterone
(ii) Thyroxine
(iii) Estrogen
(iv) Adrenaline
(v) Epinephrine
(vi) Progesterone
(vii) Glucagon
(viii) Growth hormone
(ix) Cortisol
(x) Gonadotropin releasing hormone (GnRH).

(5ci)
(PICK ANY TWO)
(i) Studies of inheritance
(ii) Mapping disease genes.
(iii) Diagnosis and treatment.
(iv) Genetic counseling.

(5cii)
(PICK ANY THREE )
(i) Chloroplast contains a photosynthetic pigment called chlorophyll.
(ii) The stomata are located on the backside of the leaves which helps regulate water loss from the leaves.
(iii) Leaves have a thin structure so that they can provide a short distance for carbon dioxide to diffuse into leaf cells
(iv) The veins of leaves help to transport maximum water molecules and water to all parts of the leaves.
(v) The plant produces larger leaves, which means a larger surface area for maximum absorption of sunlight.

BIOLOGY OBJECTIVE SOLUTIONS
01-10: BBEDAACADA
11-20: DDCEADDAEC
21-30: BBBBEDDBDD
31-40: EDACCCBCEA
41-50: EBBCACBABC
51-60: DDABEDDDBE

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