WAEC GCE Biology Objective & Theory Answer 2017 Nov/Dec Free Expo.
West African Examination Council WAEC GCE 2017 Free Objective & Theory answer, to all candidate setting for the WAEC GCE examination 2017 and you are among those that will write Biology exam on the 12th of September 2017 we present you the Answer to the Question.
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WAEC GCE Biology Objective Answer/Expo
WAEC GCE Biology Theory Answer/Expo
white blood cells
– responsible for the removal of interstitial fluid from tissues
– It transports white blood cells to and from the lymph nodes into the bones
– excretory products, such as carbon dioxide, urea, etc
Plants absorb water from the soil through their root hairs which are surrounded by soil water in the soil. The soil water is a more dilute solution than the soil sap inside the root hair hence water molecules move from soil water into the root hairs by the process of osmosis. Mineral salts are absorbed through the cell membrane often from a zone of their low concentration in the soil to a zone of their higher concentration in the cells of the roots through active absorption.
Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a placenta.
– Marginal placentation
– Parietal placentation
– Axile placentation
– Free central placentation
Community : is any naturally Occurring group of different organisms living together and interacting in the same environment.
Population: is defined as the total number of organisms of the same species living together in a given area
Ecologicalnide: Refers to the specific portion of a habit which is occupied by a particular organism
Because all living organism need energy and nutrient in an environment in other to sustrundipe
– Lack of enough food
– out break of disease
– lack of money
– Exposed the soil into erosion
– Cause loss of nutrient into the plant
– Cause low yield
Sickle cell anaemia; this is a group of disorders that affects hemoglobin , the molecule in red blood cells that delivers oxygen to cells throughout the body.
i)The presence of fossils;
preserved impressions of organisms/ ancestors that lived in the past
ii)The vestigial structures;
an organ that serves no purpose anymore but did with a common ancestor
iii)The presence of homologous structures;how the bones or parts of an animal are the same but in different proportions
iv)The comparative embryology; in development, embryos look similar until they differentiate later on
V)The molecular evidence ;comparing DNA; to trace differences and similarities in DNA and other molecules, making the species more or less related.
Irritability is the ability to be excited to a characteristic action or function by the application of some stimulus
Irritability is the Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus.
6ci) Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking
– it Destroy soil living organism
– it reduces soil fertility
– it causes soil erosion
6ei) Oviparity is the expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms. In general, the number of eggs produced by oviparous species greatly exceeds the number of offspring from species that bear live young, but the chances of survival are diminished because of the lack of maternal protection.
Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.
6eii) Viviparity is the retention and growth of the fertilized egg within the maternal body until the young animal, as a larva or newborn, is capable of independent existence. The growing embryo derives continuous nourishment from the mother, usually through
a placenta or similar structure.
Rhizobium turns the free Nitrogen in air into
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