2025 NABTEB BIOLOGY: 2025 NABTEB BIOLOGY PRACTICAL ANSWERS (4150)

(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 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) Jean–Baptiste 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 'copied from e x p o c o d e . n e t free' 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)

 (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 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

(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

(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)

Pest that attacks specimen G - army worms

Pest that attack specimen H - foliage beetles

(5cii)

Economic importance of specimen G - It is use as a source of food,

Economic importance specimen H - Source of proteins