WAEC 2023 BIOLOGY ANSWERS

BIOLOGY
01-10: CABADCCBCD
11-20: DBCDDBDBBC
21-30: ADABDAADCD
31-40: BBCBDCBBBB
41-50: ABCCBCACDA

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BIOLOGY THEORY ANSWERS

(1a)
Classification of living things is the sorting or grouping of living things according to their common or similar characteristics

(1bi)
-Fungi-
(i)Decomposition- Fungi decompose organic matter and recycle nutrients, contributing to soil health.
(ii)Medicine- Some fungi are used in medicine, such as Penicillium, which produces antibiotics.
(iii)Food- Edible mushrooms are a popular food item across the world. Certain fungi like yeast are used in baking and fermentation to produce wine and beer.
(iv)Industry- Fungi are used in industries like paper manufacturing and in the production of enzymes like citric acid and gluconic acid.

(1bii)
-Plants-
(i)Food- Plants are a major source of food for humans and animals.
(ii)Oxygen production- Through photosynthesis, green plants produce oxygen which is essential to all living organisms.
(iii)Raw materials- Fibers are obtained from plants and are used to make clothing, paper, and other products. Plants like timber and bamboo are used for construction purposes.
(iv) Medicine- Many plants contain compounds with medicinal properties that are used in traditional medicine and pharmaceutical industry.

(1c)
(i) Cnidaria; Hydra
(ii) Nematoda; Ascaris
(iii) Chordata; Dog, cat
(iv) Annelida ; Earthworm, leeches
(v) Mullusca; Snail, slugs, limpets

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(2)

 

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(5ai)
Sense organs are the specialized organs composed of sensory neurons, which help us to perceive and respond to our surroundings.

(5aii)
(i) Nose: Responds to airborne chemical substances like aroma or odors.
(ii) Taste buds: Detect chemicals present in food or solution to give the perception of taste.
(iii) Olfactory epithelium: Receives and detects dissolved substances in the mouth and throat, giving a sense of smell.

(5bi)
(i) Male Agama
(ii) Tilapia fish
(iii) Male crocodile

(5bii)
(i) Matured male and female Tilapia zilli
(ii) Matured male and Female Clarins gariepinus
(iii) Matured male and female humans

(5ci)
Both have a protective covering

(5cii)
TABULATE

=EGG OF TOAD=
(i) They do not contain the amniotic fluid
(ii) The fertilised zygote are covered with membrane
(iii) They are anamniotes.

=EGGS OF BIRDS=
(i) Contain the amniotic fluid
(ii) The fertilised zygotes are covered with shell
(iii) They are amniotes.

(5d)
TABULATE PLS
(i) Azotobacter; Produce nitrates from free nitrogen in soil

(ii) Rhizobium; Absorb atmospheric nitrogen in the soil and build up nitrates

(iii) Blue green algae; Fixes atmospheric nitrogen into nitrates

(iv) Nitrosomonas; Oxidises ammonium to nitrates

(5e)
(i) Saprophytic nutrition; Fungi, Bacteria

(ii) Symbiotic nutrition; Algae, Fungus

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COMPLETED

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