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2020 NABTEB-Biology-PRACTICALS-ANSWERS

NABTEB-Biology-PRACTICALS-ANSWERS

(1a)

(i) Production of traditional foods such as yoghurt, cheese and vingar

(ii) Curing of tobacco

(iii) Baking

(1b)

(i) Cover crop find green manure

(ii) Mixed cropping and inter-Cropping

 

(1c)

(i) Ostrogen

(ii) Progesterone

 

(1d)

(i) Stamen

(ii) Pistic

 

(1e)

(i) Oxidation and reduction of organic materials

(ii) Erosion or crop removal

 

(1f)

Aesturation

 

(1g)

i=2/1, C=0/0 P3/2, M3/3=28

 

(1h)

(i) Fruit and seed dispersal is very important for the survival of plants species

(ii) It allows plants to spread out from a wide area and avoid competing with one another

 

(1i)

Adaptation

 

(1j)

Gregor Johann mendel

 

(1k)

Xylem tissues and phloem tissues

 

(1l)

(i) Genotype

(ii) Phenotype

 

(1m)

It must have four floral parts (eg Sepal, Petals, at least one stamen and at least one pistil

 

(1n)

(i)Through heavy rainfall

(ii)Inadequate or poor drainage system

 

(1o)

(i) Epigeal germination

(ii) Hypogeal germination

=======================================

 

(2ai)

Specimen A – Tilapia Fish

Specimen B – Tadpole

 

(2aii)

Toad

 

(2bi)

TABULATE

 

Specimen A | Specimen B

 

UNDER SPECIMEN A

(i) skin is covered by scales

(ii) Has many fins for movement.

 

UNDER SPECIMEN B

(i) No external scale

(ii) They have two pairs limbs-fore limbs

and hindlimbs

 

(2bii)

(i)They both possesses his for gaseous exchange

(ii)They both possess compound eye

 

(2ci)

 

 

(2cii)

(i)They have swim bladder which enable

them to maintain buoyancy in water

(ii)They have lateral line system for pressure in water

=======================================

 

(3a)

Specimen C – Maize grain affected by mould

Specimen D – Flower of pride of Barbados

Specimen E – Egg of domestic Fowl

 

(3bi)

(i) Motel Growth in maize storage

(ii) Temperature

 

(3bii)

(i) It serves as a livestock feeding

(ii) It serves as food for human consumption

 

(3ci)

(i) Stamen

(ii) Petals

(iii) Sepals

(iv) Pistils

 

(3cii)

Insect

 

(3ciii)

(i) It has bright colored petal which attract insects

(ii) It has large or stick pollen grain

=======================================

 

(4ai)

Specimen F – Grain Weevil

Specimen G – Soldier termite

 

(4aii)

Insecta

 

(4aiii)

(i) They are tracheated Arthropoda

(ii) They possesses three pairs of jointed legs

 

(4aiv)

Both specimen F and Specimen G are insects

 

(4bi)

Termitarium

 

(4bii)

(i) The King

(ii) The Queen

(iii) The wingled reproduction

(iv) The worker

 

(4biii)

(i) The function of the king:- Is to mate or fertilize the queen

(ii) Function of the Queen:- Is to lay eggs

(iii) Function of wingled reproduction:- They can become new queens or kings in a new colony after a wedding fight

(iv) Function of Worker:- To provide food for members of the colony

=======================================

 

(5ai)

The water sink into the soil

 

(5aii)

(i)organic matter (humus)

(ii)Mineral soil

(iii)Soil air

 

(5bi)

 

 

(5bii)

Humus has many nutrients that Improve the health of soit, nitrogen being the most important and make the Soil porous

 

(5bii)

soil provides plant with foot hold

for their roots and holds the necessary

nutrients for Plants to grow

(ii)It buffers against pollutants, thus

Protecting ground water.

=======================================

Completed.

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Posted by on October 8, 2020.

Categories: NABTEB

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