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WAEC GCE BIOLOGY QUESTIONS AND ANSWERS 2020

Here is waec gce biology questions and answers for 2020. Share to your friends and good luck.

Biolojy-Obj!

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BIOLOGY THEORY ANSWERS

(3a)
TABULATE

Commensalism – Sharks and remora fish, Tigers and golden jackals

Mutualism – Bees and flowers, humans and bacteria in the gut

Parasitism – Humans and tapeworms, cows and ticks

Neutralism – Rainbow trout, and dandevon cactus, and tarantulas

(3b)
Pollution can be referred to as the introduction of harmful materials or substances into our environment thereby causing adverse charges.

(3ci)
(i)It contributes to global warming
(ii)It leaves huge carbon footprints

(3cii)
(i)it also contributes to global climate change
(ii)It emits mercury which is a neurotoxin as well as carbon dioxide

(3ciii)
(i)When it spills in aquatic bodies, it causes loss of aquatic lives
(ii)On land, crude oil spills reduce food productivity

(3)

i. Development and growth. After meiosis has produced a gamete, and this has fused with another gamete to form an embryo, the embryo grows using mitosis. …

ii. Cell replacement. …

iii.Asexual reproduction.

(6ai)
Dominance; is a relationship between two alleles of a gene and their associated phenotypes. A “dominant” allele is dominant to a particular allele of the same gene that can be inferred from the context, but it may be recessive to a third allele, and codominant to a fourth.

(6aii)
size; is the number of individuals in a population. Population density is the average number of individuals per unit of area or volume. The pattern of spacing of individuals in a population may be affected by the characteristics of a species or its environment.

(6aiii)
density is the average number of individuals in a population per unit of area or volume. For example, a population of 100 insects that live in an area of 100 square meters has a density of 1 insect per square meter.

i. Skin that prevents loss of water.

ii. Eyelids that allow them to adapt to vision outside of the water.

iii. An eardrum developed to separate the external ear from the middle ear.

iv.A tail that disappears in adulthood (in frogs and toads).