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WAEC GCE 2017: Biology OBJ And Theory Answers – WAEC GCE Expo
WAEC September 10, 2017 • 3 years ago • No Comment Yet

Tags: Free Biology Obj & Theory Answers, Free Biology Expo, Free Biology Runz, Free Biology Questions & Answers, free Biology choke, Free Biology Dubs, Biology Expo, Biology Runz, Biology Chock, complete Biology Expo, verified Biology Runz, correct Biology Chock, Confirmed Biology Dubs, wace gce Biology Obj & Theory Answers, waec gce Biology Expo, waec gce Biology Runz, waec gce Biology Questions & Answers, Free Biology Obj & Theory Answers, waec GCE Biology dubs, Free 2017 waec gce Biology Expo, Free 2017 waec gce Biology Runz, Free  2017 waec GCE Biology Questions & Answers, free  2017 waec gce Biology choke, free 2017 waec GCE Biology dubs.

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100% VERIFIED BIOLOGY THEORY QUESTIONS

OBJ
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THEORY
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? 2017 WAEC GCE BIOLOGY PRACTICAL ANSWERS?

100% VERIFIED BIOLOGY OBJ ANSWERS
1-10 BAABDDACBB
11-20 ABAAACBDCB
21-30 CBCABCBBAA
31-40 ACAACACACC
41-50 CCBADBBDAA
100% VERIFIED BIOLOGY THEORY  ANSWERS
1a)
i.
– white blood cells
– lipids
ii.
– responsible for the removal of interstitial fluid from tissues
– It transports white blood cells to and from the lymph nodes into the bones
1b)
i.
– oxygen
– excretory products, such as carbon dioxide, urea, etc
– Hormones
1b
ii. 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.
1c)
i. Placentation is the arrangement of ovules within an ovary. The part of the ovary where the ovules are attached is called a placenta.
ii.
– Marginal placentation
– Parietal placentation
– Axile placentation
– Free central placentation
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3a
i. Community : is any naturally Occurring group of different organisms living together and interacting in the same environment.
ii. Population: is defined as the total number of organisms of the same species living together in a given area
iii. 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
3c)
i.
– Lack of enough food
– out break of disease
– lack of money
ii.
– Exposed the soil into erosion
– Cause loss of nutrient into the plant
– Cause low yield
d). Cover cropping helps to protect the soil from direct sunlight and and severe erosion
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4a)
i. 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.
4d)
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.
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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
6b)
i. Irritability is the Abnormal sensitivity or excessive responsiveness, as of an organ or body part, to a stimulus.
ii.
a. light
b. water
6c)
i. Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning.
ii.
i)it cause soil erosion
ii)it destroys soil living organisms
iii)it reduces soil fertility
iv)it leads to degredation
6d)
the female curves her back and lift her taik in the front of the male when the male is attracted he chases and mounts the female and he pushes the base of his tail beneath that of the female and their cloacal vents come into contact
6e)
i. Oviparity is the producing eggs that mature and hatch after being expelled from the body, as birds, most reptiles and fishes, and the monotremes.
ii. 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.
6f)
i)ammonia
ii)nitrate

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