2026 WAEC BIOLOGY PRACTICAL ANSWERS



(1)




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

(2ai)
(PICK ANY TWO)
(i) Peristalsis
(ii) Mechanical digestion
(iii) Chemical digestion of proteins
(iv) Absorption of water, alcohol and some drugs.

(2aii)
(PICK ANY TWO)
(i) Peristalsis — Oesophagus
(ii) Mechanical digestion — Stomach.
(iii) Chemical digestion of proteins — Stomach.
(iv) Absorption of water, alcohol and some drugs —Stomach.

(2b)
(PICK ANY TWO)
(i) Thick muscular walls
(ii) Presence of folds (rugae) in the stomach lining
(iii) Long tubular oesophagus
(iv) Mucous lining

(2c)
(i) Pepsin
(ii) Gastric lipase

(2d)


(2ei)
Parasitism

(2eii)
(PICK ANY ONE)
(i) One organism (mistletoe) benefits while the other (host plant) is harmed.

(ii) The mistletoe lives on the host plant and derives nourishment from it while harming it.

(iii) The parasite depends on the host plant for water and mineral nutrients.

(iv) The host plant loses nutrients to the mistletoe.

(2eiii)
(PICK ANY ONE)
(i) Presence of haustoria (sucking roots) which penetrate the host plant and absorb water and nutrients.

(ii) Possession of sucking roots for attachment and absorption of nutrients from the host plant.

(2eiv)
(PICK ANY TWO)
(i) The branch shows stunted growth.
(ii) The branch becomes weakened.
(iii)The branch may dry up and die.
(iv) The branch loses water and nutrients.

(2ev)
(PICK ANY ONE)
(i) Dodder growing on a host plant.
(ii) Witchweed on maize.
(iii) Mistletoe on mango or orange tree

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

(3a)


(3b)
(PICK ANY TWO)
(i) Fungi
(ii) Bacteria

(3c)
(i) Weevil
(ii) Grain beetle

(3d)


(3e)
(PICK ANY ONE)
The quadrat is placed randomly on the study area. All the organisms found within the quadrat are identified and counted. The quadrat is then moved to different positions and the counting is repeated several times. The results obtained are recorded and averaged to estimate the population density and distribution of organisms in the habitat.

OR

A quadrat is placed randomly on the ground and the organisms within it are counted. This process is repeated at several points, and the average count is used to estimate the abundance and distribution of organisms in the area.