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Biology practical

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BIOLOGY PRACTICAL ANSWERS
(1ai)
Specimen A - onion (bulb)
Specimen B - Ginger (Rhizome)
Specimen C - Irish potato (tuber)
Specimen D - Potted bean seedlings (A week old)
Specimen E - Maize grain

(1aii)
Specimen A - By bulbs
Specimen B - By Rhizomes
Specimen C - By tubers

(1aiii)
Check the diagram below

(1aiv)
Specimen D - Epigeal germination
Specimen E - Hypogeal germination

(1av)
-Specimen D-
(PICK ANY TWO)
(i) The cotyledons are brought above the ground during germination.
(ii) The hypocotyl elongates and arches, forming a hook.
(iii) The hook grows upward until it reaches the surface of the soil.
(iv) The cotyledons then spread out and become the first leaves of the plant.

-Specimen E -
(PICK ANY TWO)
(i) The cotyledons remain below the ground during germination.
(ii) The epicotyl elongates and arches, forming a hook.
(iii) The hook grows upward until it reaches the surface of the soil.
(iv) The cotyledons then spread out and become the first leaves of the plant.

(1avi)
Specimen D - Tap root system
Specimen E - Adventitious root system

(1avii)
Specimen D - Pinnate venation
Specimen E - Parallel venation

(1aviii)
Specimen A - scales
Specimen B - Rhizome
Specimen C - Eyes

(2ai)
Specimen; F - Pigeon's head with the neck

Specimen; G- Atlas vertebra of a Rabbit

Specimen; H- Lumbar vertebra of a Rabbit

Specimen; I-Cactus plant

Specimen; J - Water lettuce

(2aii)
To support the head and allow for flexibility and movement of the neck.

(2aiii)
Specimen G (Atlas vertebra):
located in the cervical region (neck) of the rabbit.

Specimen H (Lumbar vertebra): Located in the lower back region of the rabbit.

(2aiv)
Occipital bone

(2av)
Diagram

(2avi)
Mammalia.

(2avii)
Specimen I; Cactus plant
(i) Stem succulence (ability to store water in the stem)
(ii) Spines (reduce water loss through transpiration)
(iii) Deep roots (access water deep in the soil)

Specimen J; Water lettuce
(i) Floating leaves (allow the plant to stay afloat on the water surface)
(ii) Long stems (allow the plant to absorb nutrients from the water)


(3ai)
Specimen; K-Ripe Tomato fruit

Specimen; L - Ripe Palm fruit

Specimen; M-Ripe Tridax fruit

Specimen; N - Ripe Mango fruit

Specimen; O-Ripe flamboyant flower.

(3aii)
Specimen K; Berry

Specimen L; Berry

Specimen M; Cypsela

(3aiii)
Specimen K; Axile
Specimen N; Axile

(3aiv)
Specimen L; Dispersal by Animal

Specimen M; Dispersal by wind

(3av)
(i) Hooks
(ii) Lightweight
(iii) Sticky surface

(3avi)
Specimen K
(i) Small sized
(ii) Red coloured

Specimen
(i) Big sized
(ii) Yellow coloured

(3avii)
Diagram

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