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Past WAEC GCE 2018 Biology Answers

BIOLOGY OBJ:
1-10: BAABDDACCB
11-20: ABAAACBDCB
21-30: CBCABCBBAA
31-40: ACAACACACC
41-50: CCBADBBDAA

(1ai)
-white blood cells
-lipids
(1aii)
-Responsible for the removal of interstitial fluid from tissues
-It transports white blood cells to and from the lymph nodes into the bones
(1bi)
-oxygen
-excretory products, such as carbon dioxide, urea, etc
-Hormones
(1bii)
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.
(1ci)
Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a placenta.
(1cii)
-Marginal placentation
-Parietal placentation
-Axile placentation
-Free central placentation

(3ai)
Community is any naturally Occurring group of different organisms living together and interacting in the same environment.
(3aii)
Population is defined as the total number of organisms of the same species living together in a given area
(3aiii)
Ecologicalnide refers to the specific portion of a habit which is occupied by a particular organism
(3b)
Because all living organism need energy and nutrient in an environment in other to sustrundipe
(3ci)
-Lack of enough food
-out break of disease
-lack of money
(3cii)
-Exposed the soil into erosion
-Cause loss of nutrient into the plant
-Cause low yield

(6a)
(i)it has gills for gaseous exchange
(ii)it has a long tail that facilitates its movement
(iii)its sucker secretes sticky cement which aids attachment to water weeds
(iv)it has mouth with horny jaw for feeding

(6bi)
Irritability is the ability to be excited to a characteristic action or function by the application of some stimulus
(6bii)
-Water
-Light
(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
(6cii)
-it Destroy soil living organism
-it reduces soil fertility
-it causes soil erosion
(6d)
Territoriality: this is the process in which male agama lizard prevent other males frm entering into it niche containing few female lizard, colour display: male agama lizard may bask in d sun so dat it reddish head will become more brigther in order to attract potential female lizard
(6ei)
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.
(6f)
Rhizobium turns the free Nitrogen in air into
-Ammonia
-Nitrate