2021 NABTEB BIOLOGY PRACTICAL ANSWERS

2021 NABTEB BIOLOGY PRACTICAL ANSWERS

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(NUMBER 1)

(i)

(i) They are proteins in nature

(ii) They act best at specific pH (either acidic or alkaline)

(ii)

(i) Auxins

(ii) Gibberellins

(iii)

(i) Fever

(ii) Dry cough

(iii)Tiredness

(iv) Headache

(iv)

(i) Have Three pairs of thoracic legs

(ii)Three body divisions namely, head, thorax and abdomen

(v)

Dog... i 3/3 c1/1 pm4/4 m2/3 = 42 teeth

(vi)

(i) Tannins

(ii) Gum and mucilageand mucilage

(vii)

Corolla

(viii)

(i) Shoulder and chest broadens

(ii) Production of sperms

(ix)

Located in the upper thoracic region on the dorsal surface of the rib cage

(x)

(a) Turbidity/transparency of water bodies

(b) Atmospheric pressure

(xi)

(i) They anchor plants firmly in the soil.

(ii) Root conducts water and mineral salts upward to the stem and into the leaves.

(xii)

(i) Charles Darwin

(ii) JeanBaptiste Lamarck

(xiii) A dominant gene is one of the alternative forms of a gene which masks the effect of the other (recessive gene)

(xiv)

(i) Cataracts

(ii) Glaucoma

(iii) Myopia or near near sightedness

(vi) Hypermetropia or far sightedness

(xv)

Pick one

(a)

(i)Transport carbon dioxide from the tissues to the lungs

(ii) pH of blood i.e. formation of carbonic acid

Pick one

(b)

(i) Produces antibodies which provides immunity

(ii) Engulf bacteria (phagocytes)

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(2a)

Specimen A - Tilapia fish

Specimen B - Toad/frog (adult)

(2bi)

Specimen A - Class Osteichthyes

Specimen B - Class Amphibia

(2bii)

(i) Have thin, loose, moist smooth and scale less skin

(ii) Have no teeth

(2ci)

(i) Salamander

(ii) Newt

(2cii)

Habitat for specimen A - Aquatic (fresh water)

Habitat of specimen B - Moist, shady places

(2di)

Specimen A - Source of food/protein/vitamins

Specimen B - Toads serves as biological control of insects which are pests of farm crops/man

(2dii)

(i) Adaptive feature of specimen A - Streamlined body shape for easy movement in water

(3ai)

Hibiscus flower

(3aii)

Insect

(3b)

Male reproductive part - Stamens

Female reproductive part - Carpels

(3c) Drawing

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(4ai)

Specimen D - bedbug

Specimen E - dog tick

Specimen F - cockroach

(4aii)

Habitat for specimen D - Crevices of furniture and beds.

Habitat of specimen E - On dogs or cattle.

Habitat of specimen F - Inside cupboards.

(4bi)

Parasitic relationship

(4bii)

Control of speimen D - yusng esicide or chemicals.

Control ofspcimenE- yuin tk ssto kilhem

Cnrl of specmenF - spraying with insecticides or pesticides.

(4c)

Economic importance of specimen D - It cause diseases in human (anaemia), i iscotlyin controllng the

Econoic impotance of specimenF - Transmits drt/Cotaminaes food, heir faecesthebok

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(5ai)

SpeimG- Maz r

Specen  - cowpeaseed

(5aii)

Germination of specime G - Hypogeal gerination

Germination of specimen H - Epigeal germination(5bi)

Food stores byspecimen G - Crbohydrate

Food stored by specimen H - proein

(5bii)

Venation in specmen G - Paralll veation Venation in specimen - net or reticulate venatin

(5ci)

Pest that attacks specimen G - army worms

Pest that attack specimen H - foliage beetles

(5cii)

Economic importance of specmen G  It is use s a soure of food,

Ecnomic imporance specimen H - Source of proteins