NABTEB BIOLOGY PRACTICAL ANSWERS

NABTEB BIOLOGY PRACTICAL

*SECTION A*

*(NO 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 mucilage and 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) Jean–Baptiste Lamarck

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

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(xiv)
(i) Cataracts
(ii) Glaucoma
(iii) Myopia or near nearsightedness
(vi) Hypermetropia or farsightedness

(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 that provide immunity
(ii) Engulf bacteria (phagocytes)

*SECTION B*

*(NO 2)*
(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 scaleless skin
(ii) Have no teeth

(2ci)
(i) Salamander
(ii) Newt

(2cii)
Habitat for specimen A – Aquatic (freshwater)
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

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(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

(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 specimen D – by using pesticides or chemicals.
Control of specimen E – by using tick sprays to kill them.
Control of specimen F – spraying with insecticides or pesticides.

(4c)
Economic importance of specimen D – It cause diseases in human (anaemia), it is costly in controlling them
Economic importance of specimen F – Transmits dirt/Contaminates food, Their faeces stains clothes/books

(5ai)
Specimen G – Maize grain
Specimen H – cowpea seed

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(5aii)
Germination of specimen G – Hypogeal germination
Germination of specimen H – Epigeal germination

(5bi)
Food stores by specimen G – Carbohydrate
Food stored by specimen H – protein

(5bii)
Venation in specimen G – Parallel venation Venation in specimen H- net or reticulate venation

(5ci)
A pest that attacks specimen G – armyworms
A pest that attacks specimen H – foliage beetles

(5cii)
Economic importance of specimen G – It is used as a source of food,
Economic importance specimen H – Source of proteins

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