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Nabteb 2018 Biology Practical Answers

Posted by admin on 12th November Nov » 117 views
NABTEB BIOLOGY PRACTICAL

(1)
(i) Photometer or light meter
(ii) Crabs, periwinkles, starfish, shrimps, bony fish i.e tilapia
(iii) Carbon dioxide, excess water
(iv) Malleus or hammar
- Stapes or stirrup
- Incus or anvil

(v)
- Osmosis occurs in liquid medium only
- Diffusion occurs in gases and liquids
- Osmosis occurs naturally in living organisms
-Diffusion occurs in living and non-living organisms

(vi)
- pairing
- display

(vii) – There is absence of scent
– flowers are usually dull coloured
(viii) It produces an oil called sebum that keeps skin moist

(ix) (i) Xerophyte ==> possession of deep root structures
- Possession of thin or small leaves and waxy surfaces to retain moisture
(ii) Hydrophyte; possession of large flat leaves on surface plants for floatation
- Possession of thin cuticle

(x) wind and animals

(xii)
==> Short - sightedness (myopia)
==> Astigmatism

(xii)
- It is used for detection of vibration and pressure in water

(xiii)
- shortage of space
- Shortage of food
- Competition

(xiv)
- black pain
- Dark urine
- Fainting or dizziness

(xv)
(a) Natural method of vegetative propagation
(b) Cuttings method




(2ai)
A – Queen termite
B – Soldier termite

(2aii)
- Compound eye
- Spiracle
- Abdomen
- Hardened cuticle
- Antenna
- Powerful jaw/mandible

(2b)
TABULATE:
Under A (Queen)
- Large abdomen
- Small present
- Eye present
- Mandible absent

Under B (Soldier)
- Small abdomen
- Large head
- Eye absent
- Present of powerful mandible

(2c)
(i) Phylum – Arthropoda
Class – insect

(II)
- 3 pairs of jointed legs
- Abdomen is segmented
- Presence of spiracles on abdomen
- Presence of jointed antennae




(3)
(ai) The Human Eye (vertical section)

(3aii)
I ==> sclerotic layer
II ==> Eye controlling muscle
III ==> Retina
IV ==> Yellow sport
V ==> Optical nerve
VI ==> Blind spot
VII ==> Iris
VIII ==> Pupils
IX ==> Lens
X ==> Conjuctiva

(3aiii)
(ii) It controls eye movement
(iii) It helps to detect colours of object
(v) It transmits sensory impulse to the brain
(vii) It controls the amount of light passing through the eye
(ix) It helps to refracts light rays that enters the eye

(3bi) Bright light – muscles of the iris contract, making pupil small and reduce the amount of light entering the eye.

(3bii) Dim light – it tends to expand in dim light

(3ci)
(i) Short – sightedness (myopia)
(ii) Long – sightedness (hypermetropia)
(iii) Astigmatism

(3cii)
(i) Short sightedness is by wearing spectacles fitted with concave or diverging lenses
(ii) Long sightedness is by using spectacles fitted with suitable convex or converging lenses
(iii) Astigmatism is by using cylindrical lenses

(3d)
(i) Use clean water to wash face always
(ii) Avoid staying in areas containing fumes or smoke that can irritate eye
(iii) Avoid rubbing eyes with dirty fingers




(4a)
(i) Shoot
(ii) Bulb
(iii) Corm
(iv) Cutting

(4b)
(i) Shoot
(ii) Stem
(iii) Stem
(iv) Leaves

(4c)
(i) Adventitions Root
(ii) Stem
(iii) leaves

(4d)
I ==> Fleshy leaves
II ==> use of modified underground stem
III ==> Layering





(5)
A ==> Alleles
B ==> Alleles

(5b)
(i) Parents – pure bread black mice
(ii) Offspring – 3 black and 1 white
Parent ==> 00 00
Offspring ==> 00 00

(5c)
(i) The genotype of the gamates is hertrozygons back e.g 00 00

(ii) The genotype of the offspring is

1. Homozygous black 00 dominant
2. Heterozygous black 00 dominant
3. Homozygous white 00 recessive

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