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IMPORTANT NOTICE: NABTEB GCE QUESTIONS ARE OFFERED IN TWO(2) TYPES (A & B). PLEASE ENSURE YOU SELECT THE SOLUTIONS THAT CORRESPOND TO YOUR PAPER TYPE. THANK YOU!
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BIOLOGY PRACTICAL ANSWERS (TYPE A)
(1a)
Ribonucleic Acid
(1b)
Mollusca
(1c)
Osmosis is the movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
(1d)
[TABULATE]
=PLASMOLYSIS=
Occurs in plant cells when water moves out, causing the cell membrane to shrink from the cell wall.
=HAEMOLYSIS=
Occurs in red blood cells when excess water enters, causing the cells to burst.
(1e)
(i) Genetic recombination during reproduction
(ii) Mutation
(1f)
(a) Through contaminated food or water
(b) By insect vectors
(1g)
(a) They carry genes that determine traits.
(b) They ensure genes are accurately transferred during cell division.
(1h)
Mammal: Kidney
Unicellular organism: Contractile vacuole
(1i)
Carolus Linnaeus
(1j)
(i) Charles Darwin
(ii) Jean Baptiste de Lamarck
(1k)
[TABULATE]
=XEROPHYTES=
(a) Thick cuticle to reduce water loss.
(b) Long roots to reach deep water.
=HYDROPHYTES=
(a) Presence of air spaces for buoyancy.
(b) Stomata on upper leaf surface for gas exchange.
(1l)
(i) Regulation of body temperature.
(ii) Protection against infection and dehydration.
(1m)
Wind speed: Anemometer.
Rate of transpiration: Potometer.
(1n)
(i) Geotropism is the growth response of a plant to the force of gravity.
(ii) Budding
(1o)
(i) Use of condoms
(ii) Oral contraceptive pills
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(2a)
Fig. 1: Frog
Fig. 2: Bird
(2b)
[IN A TABULAR FORM]
=Fig. 1 (Frog)=
(i) Moist, smooth skin
(ii) Has webbed hind limbs for swimming
(iii) No beak but has a wide mouth
=Fig. 2 (Bird)=
(i) Covered with feathers
(ii) Has wings for flying
(iii) Has a beak for feeding
(2c)
(i) Webbed hind limbs – for swimming.
(ii) Moist skin – for gaseous exchange.
(iii) Streamlined body – for easy movement in water.
(iv) Eyes and nostrils on head – for seeing and breathing while partly submerged.
(2d)
(a) Nectar: None (Frogs do not feed on nectar)
(b) Flesh: Long, sticky tongue for catching prey.
(2e)
Fig 1: Amphibia
Fig 2: Aves
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(3a)
A. Pulmonary artery
B. Left Atrium
C. Biscupid valve
D. Septum
E. Left Ventricle
F. Right Ventricle
G. Tricuspid Valve
H. Inferior Vena Cava
I. Pulmonary Valve
J. Right Atrium
K. Pulmonary vein
L. Superior Vena Cava
M. Aorta
(3b)
It pumps blood to the lungs and all parts of the body.
(3c)
The septum is thicker and muscular to separate oxygenated and deoxygenated blood and to provide strong support for ventricular contractions.
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(4a)
(i) Terrestrial habitat:
Grasshopper -> Lizard -> Snake -> Hawk
(ii) Aquatic habitat:
Plankton -> Tadpole -> Fish -> Kingfisher
(4b)
(i) Herbivore: Grasshopper
(ii) Carnivores: Hawk, Lion
(iii) Decomposers: Earthworm, Mushroom
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(5a)
(5b)
Total number of petals collected:
10 + 38 + 16 + 2 + 1 + 68 + 40 + 30 = 205 petals
(5c)
(i) Genetic differences between different plant species or varieties.
(ii) Environmental factors such as soil nutrients, water availability, and sunlight.
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BIOLOGY PRACTICAL ANSWERS (TYPE B)
(1a)
(i) Use of condoms
(ii) Oral contraceptive pills
(1b)
(i) Geotropism is the growth response of a plant to the force of gravity.
(ii) Budding
(1c)
Wind speed: Anemometer
Rate of transpiration: Potometer
(1d)
(i) Regulation of body temperature
(ii) Protection against infection and dehydration
(1e)
[TABULATE]
=XEROPHYTES=
(a) Thick cuticle to reduce water loss.
(b) Long roots to reach deep water.
=HYDROPHYTES=
(a) Presence of air spaces for buoyancy
(b) Stomata on upper leaf surface for gas exchange.
(1f)
(i) Charles Darwin
(ii) Jean Baptiste de Lamarck
(1g)
Carolus Linnaeus
(1h)
Ribonucleic Acid
(1i)
Mollusca
(1j)
Osmosis is the movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
(1k)
[TABULATE]
=PLASMOLYSIS=
Occurs in plant cells when water moves out, causing cell membrane to shrink.
=HAEMOLYSIS=
Occurs in red blood cells when excess water enters causing burst.
(1l)
(i) Genetic recombination during reproduction
(ii) Mutation
(1m)
(a) Through contaminated food or water
(b) By insect vectors
(1n)
(a) They carry genes that determine traits.
(b) They ensure genes are accurately transferred during cell division.
(1o)
Mammal: Kidney
Unicellular organism: Contractile vacuole
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(2a)
(2b)
Total number of petals collected:
10 + 38 + 16 + 2 + 1 + 68 + 40 + 30 = 205 petals
(2c)
(i) Environmental factors such as soil fertility, sunlight, or water availability.
(ii) Genetic differences among plants..
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(3a)
(i) Terrestrial habitat:
Rabbit -> Snake -> Hawk -> Lion
(ii) Aquatic habitat:
Plankton -> Tadpole -> Fish -> Kingfisher
(3b)
(i) Herbivore: Rabbit
(ii) Carnivores: Snake, Lion
(iii) Decomposers: Earthworm, Mushroom
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(4a)
A. Pulmonary artery
B. Left Atrium
C. Biscupid valve
D. Septum
E. Left Ventricle
F. Right Ventricle
G. Tricuspid Valve
H. Inferior Vena Cava
I. Pulmonary Valve
J. Right Atrium
K. Pulmonary vein
L. Superior Vena Cava
M. Aorta
(4b)
It pumps blood to the lungs and all parts of the body.
(4c)
The septum is thicker and muscular to separate oxygenated and deoxygenated blood and to provide strong support for ventricular contractions.
===================================
(5a)
Fig. 1: Frog
Fig. 2: Bird
(5b)
[IN A TABULAR FORM]
=Fig. 1 (Frog)=
(i) Moist, smooth skin
(ii) Has webbed hind limbs for swimming
(iii) No beak but has a wide mouth
=Fig. 2 (Bird)=
(i) Covered with feathers
(ii) Has wings for flying
(iii) Has a beak for feeding
(5c)
(i) Webbed hind limbs – for swimming.
(ii) Moist skin – for gaseous exchange.
(iii) Streamlined body – for easy movement in water.
(iv) Eyes and nostrils on head – for seeing and breathing while partly submerged.
(5d)
(a) Nectar: None (Frogs do not feed on nectar)
(b) Flesh: Long, sticky tongue for catching prey.
(5e)
Fig 1: Amphibia
Fig 2: Aves
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