Waec Biology theory and objectives 9:30am – 12pm

Waec Biology theory and objectives 9:30am – 12pm will be dropped some minutes


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Updated: September 10, 2021 — 6:58 am

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  1. (1a)
    (i) Plasma
    (ii) Red blood cell
    (iii) White blood cell
    (iv) Platelets

    1b)
    (i) Plasma
    (ii) White blood cells
    (iii) Red blood cells
    (iv) Platelets
    (v) Red blood cells
    (vi) Platelets
    (vii) White blood cells

    (1c)
    (i) Amino acids
    (ii) Glucose
    (iii) Mineral salts and water

    (1d)
    (i) Anemia
    (ii) Haemophilia
    (iii) Blood clots
    (iv) Leukemia

    (1e) Disease of the blood is dangerous because it can lead to other issues and consequently death.

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    (2a) Dentition pertains to the development of teeth and their arrangement in the mouth. … The dentition of animals with two successions of teeth (deciduous, permanent) is referred to as diphyodont, while the dentition of animals with only one set of teeth throughout life is monophyodont.

    (2b) A tooth consists of enamel, dentin, cementum and pulp tissue. The portion of a tooth exposed to the oral cavity is known as the dental crown, and the portion below the dental crown is known as the tooth root. The dental pulp cavity exists in the center of the tooth, through which the dental pulp, called the nerve, runs. In order to receive an impact on the tooth and to absorb and alleviate the force on the jaw, the surface of the tooth root area (cementum) and the alveolar bone are connected by a fibrous tissue called the periodontal ligament. The tooth is supported by the tissue consisting of the alveolar bone, gums and the periodontal ligament.

    (i) Enamel: The hardest bodily tissue covering the surface of the dental crown. It is as hard as crystal (7 on the Mohs scale of mineral hardness).
    (ii) Dentin: The tissue that forms the tooth from the dental crown to the tooth root, situated inside the enamel and cementum. It is softer than the enamel. A small tube filled with tissue fluid, called the dentinal tubule, runs inside the dentin.
    (iii) Cementum: The tissue covering the surface of the tooth root. It connects the alveolar bone with the tooth by the periodontal ligament. Its hardness is similar to bone.
    (iv) Dental pulp: The tissue is called the nerve. Blood vessels and the lymph vessels, as well as nerve fibers, are located in the dental pulp, supplying nutrients to the dentin.

    (2c)
    (i) cellulose
    (ii) Starch
    (iii) Sugar

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    3bi. carbon dioxide (CO2),
    ii. energy,
    iii. water,
    iv. plant nutrients
    v. resynthesized organic carbon compounds.

    *Pick any 4 Only*
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    (4a)
    TABULATE PLS

    =ANIMAL=
    (i) Peacock
    (ii) Horse
    (iii) Python
    (iv) Lion
    (v) Elephant

    =ONE BODY PARTS THAT MAKES ANIMAL ENDANGERED BY HUMAN ACTIVITIES=
    (i) Feathers
    (ii) Tail
    (iii) Skin
    (iv) Skin
    (v) Tusk

    (4b)
    (i) Overgrazing; The activity of Overgrazing leads to the extraction of grasses which invariably leads to erosion-wasting away of the soil surface

    (ii) Poaching; Poaching which is damage by the soil and grass also leads to gulley erosion

    (4c)
    (i)The establishment of forestry departments and establishment of environment Protection agency to improve the situation.

    (ii)the role of creation of Parks and Games Reserves/any correctly named example.

    (iii)the role of conservation education carried out through tree planting/ campaigns against bush burning/ tree.

    (iv)the role of preserve/maintain plants and animals in their natural environment
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    5.g. Biofuel, any fuel that is derived from biomass—that is, plant or algae material or animal waste. Since such feedstock material can be replenished readily, biofuel is considered to be a source of renewable energy, unlike fossil fuels such as petroleum, coal, and natural gas.

    (5g) ii.Biodiesel
    Ethanol
    Wood
    Biogas

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