WAEC GCE Biology Obj And Essay/Theory Questions and Answer – NOV/DEC 2017 Expo Runz.

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BIOLOGY OBJ

1-10 BAABDDACBB

11-20 ABAAACBDCB

21-30 CBCABCBBAA

31-40 ACAACACACC

41-50 CCBADBBDAA

1ai) 

-white blood cells

lipids

aii)

-responsible for the removal of interstitial fluid from tissue

-It transports white blood cells to and from the lymph nodes into the bones

1b)

-oxygen

-excretory products, such as carbon dioxide, urea, etc

-Hormones

-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.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

3ci)

1). Lack of enough food

2) out break of disease

3) lack of money

Cii)

i.Exposed the soil into erosion

ii.Cause loss of nutrient into the plant

iii.Cause low yield

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5ai)floral formula :is a number and symbols used to represent a part of flower

5eii) Biochemical Oxygen Demand is an important water quality parameter because it provides an index to assess the effect discharged wastewater will have on the receiving environment.

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(6a)-tail which makes it bulkier and swim away from predation

-bouyancy

(6bi)-this is the ability of a living organism to perceive and respond to a change in it environment(stimulus)

(6bii)-water, light

-presence of lungs

-steamlined body

6biii)

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

(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.

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. 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

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