Thursday, 15th May 2025
Biology 3 (Alternative to Practical Work) — 09:30am – 11:30am
(1)
[VERSION I]
(1a)
(i) Arthropoda
(ii) Insecta
(1b)
(PICK ANY THREE)
(i) It has three pairs of jointed legs.
(ii) The body is divided into head, thorax, and abdomen.
(iii) It possesses one pair of antennae.
(iv) It has compound eyes.
(v) It has two pairs of wings (in most cases), aiding in movement.
(1c)
Parasitism
(1d)
(PICK ANY TWO)
(i) Strong mandibles for boring into bean seeds.
(ii) Hard exoskeleton for protection.
(iii) Small, compact body to enter seeds easily.
(iv) Well-developed antennae for detecting host seeds.
(1e)
(PICK ANY TWO)
(i) Sun-drying to reduce moisture content.
(ii) Storing in airtight containers.
(iii) Applying insecticides or natural repellents.
(iv) Keeping in cool, dry storage facilities.
(1fi)
(PICK ANY TWO)
(i) Used as a source of food for humans.
(ii) Used as animal feed.
(iii) Source of income when sold in markets.
(iv) Used in crop rotation to improve soil fertility (as legumes fix nitrogen).
(1fii)
Protein
(1g)
OR
[VERSION III]
(2)
[VERSION I]
(2ai) EDITED — PLEASE TAKE NOTE
[VERSION II]
(2ai)
E – False and Composite fruit
F – True and simple fruit
(2aii)
Axile Placentation
(2aiii)
(PICK ANY ONE)
The ovary is divided into several chambers (locules).
OR
The ovules are attached to a central axis within the ovary.
OR
The septa join at the center of the ovary to form a central column where the ovules are borne.
(2bi)
E: False fruit
F: True fruit
(2bii)
E:
(PICK ANY ONE)
It develops from an inflorescence.
OR
Other floral parts such as sepals, petals, and receptacles form the fruit.
F:
(PICK ANY ONE)
It develops solely from the ovary of a flower.
OR
It contains seeds that are formed from fertilized ovules within the ovary.
(2ci)
(PICK ANY THREE)
(i) Both are edible fruits.
(ii) Both contain juice.
(iii) Both have a tough outer covering (rind/skin).
(iv) Both are fleshy fruits.
(2cii)
(PICK ANY THREE)
E: Pineapple is a false fruit.
F: orange is a true fruit.
E: Pineapple is cylindrical in shape.
F: orange is typically spherical.
E: Pineapple has a rough, scaly outer surface.
F: orange has a smooth, leathery skin.
E: Pineapple is a multiple fruit
F: orange is a simple fruit.
(2di)
Animal dispersal.
(2dii)
(PICK ANY ONE)
The fruit is fleshy and juicy, which attracts animals and humans.
OR
The seeds are enclosed and protected within the edible part of the fruit.
OR
Animals eat the fruit and discard the seeds.
OR
The seeds pass through the digestive tract of animals and are excreted elsewhere.
(2e)
(3ai)
TEST: Specimen G + Water + NaOH(aq) + CuSO₄(aq)
OBSERVATION: A purple coloration appears
INFERENCE: Protein is present
(3aii)
Biuret test for protein
(3aiii)
Millon’s test
(3aiv)
(PICK ANY TWO)
(i) Milk
(ii) Fish
(iii) Beans
(iv) Meat
(v) Groundnut
(3b)
TEST: Water + NaOH(aq) + CuSO₄(aq)
OBSERVATION: No color change (It remains deep blue)
INFERENCE: Protein is absent
(3c)
(3d)
(i) Kingdom: Animalia
(ii) Phylum: Chordata
(iii) Class: Aves
(3e)
(PICK ANY TWO)
(i) It serves as a rich source of animal protein for human consumption.
(ii) It is used in the production of confectioneries and baked goods.
(iii) It is a source of income for poultry farmers and egg sellers.
(iv) It is used in manufacturing vaccines and biological research.
(v) It is included in animal feed as a protein supplement, especially the shell and yolk in processed form.
(3f)
(PICK ANY TWO)
(i) Poultry farm
(ii) Forest
(iii) Grassland
(3g)
(PICK ANY THREE)
(i) Chicken
(ii) Duck
(iii) Turkey
(iv) Goose
(v) Quail
(vi) Guinea fowl
[VERSION II] (3)
QUESTIONS:
BIOLOGY PRACTICAL SPECIMEN
Specimen A: Bean weevil
Specimen B: Bean seeds (with holes)
Specimen C: Waterleaf plant (whole)
Specimen D: Quill feather of a domestic fowl
Specimen E: Pineapple fruit (longitudinal section).
Specimen F: Orange fruit (transverse section)
Specimen G: Raw egg of a domestic fowl (freshly procured with shell intact)
Specimen H: Test tube containing 3 ml of water (placed on a test tube rack)
Specimen J: Longitudinal section of boiled egg (with shell)