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WAEC 2016/2017 Biology Objectives & Theory Answers Posted Here 19th April, 2016


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BIOLOGY OBJECTIVES
1DCDACACCDC
11CCBDADBBCD
21DCBDDDBACB
31CDABBBBDDB
41DBCAABADBC
BIOLOGY THEORY
1a)
-Single/independent free living organism eg amoeba
-As a colony eg volvox
-As a filament
eg spirogyra

1b)
Draw The Diagram

-Amoeba
-Volvox
-Spirogyra

1ci)
-Plant cell are rectangular in shape while Animal cell are spherical in shape
-Plant cell contain chloroplast while animal cell do not contain chloroplast
-Plant cell contain cell wall while animal cell do not contain cell wall
-Plant cell nucleus is at the side while the animal cell is at the middle

1cii)
-They both have nucleus
-They both have mitochondrion
-They both have endoplasmic reticulum
2a)
Mouth,Oesophagus,Stomach,Duodenum,Small intestine,Caecum,Appendix,Large intestine,Rectum,Anus

2bi)
TABULATE
Alimentary canal of birds|Alimentary canal of man
-There is presence of crop|Crop absent
-There is presence of proventiculus|Proventiculus absent
-There is presence of gizzard|Gizzard is absent

2bii)
-Both have caecum
-Both have Oesophagus
-Both have duodenum

2c)
Herbivore posses heterodant type of dentition in which they posses teeth of different shapes and sizes.Herbivores feed mainly on vegetable hence its teeth is 28 in numbers.Its incisors are flat with sharp cutting edges for cutting vegetables or grasses .canine is absent.the space creates due to absense of the canine is called diastema.Diastema allows manipulation of grasses in the mouth.It has a very large molar and premolar closely packed and have very large ridged surface area for cutting and grinding

2d)
-They help in regulation of blood sugar by producing insuling and glucagon
-They help in digestion

3aii)
-They help in the decay of the organisms
-They also help to return certain substances like gases eg Nitrogen to the atmosphere thereby regulating certain biological processes such as the Nitrogen cycle,carbon cycle
-Some of the substances released are important in processes such as respiration,photosynthesis

3b)
Energy flows basically from the producers in a fresh water habitat to the consumers.The producers usually are phytoplanktons which are taken up by the primary consumers usually small fishes.The primary consumer are taken up by the secondary consumers which are larger fishes such as sharks.This sharks may inturn be taken up by man which is the tertiary consumer

SCHEMATIC DIAGRAM
Phytoplanktons->Small fishes->Sharks->Man

3c)
-They causes diseases such as rice smut,black pod of cocoa which may lead to waste
-They also reduce the economic value of plants leading to financial loss

3cii)
-They help in fermentation of certain substances like yughourt eg lactobacillus species
-They help in decomposition and decay of substances eg sprophytic micro organism
-They causes diseases eg smallpox and chicken pox hence have been useful tools in the development of antibiotics and vaccines
-They are useful in certain biological processes eg photosynthesis
-They are used in sewage treatment
-Sources of enzymes

6a)
-Tactic movement movement is found in some plant and animals while nastic movement is found in plants alone
-Tactic movement rsponse to directional stimuli while nastic movement respond to non directional stimuli

6bi)
-Euglena
-Chlamydomonas

6bii)
-Mimosa plant
-Sunflower

6ci)
-Regular cleaning
-Exposure to fresh air
-Eating balanced diet
-Regular exercise

6cii)
-Temperature
-pressure
-Pain
-Cold


6d)
-High temperature affect evaporation and reduces performance
-High temperature may lead to seed dormancy
-It leads to loss of soil nutrients through evaporation
-It affects the ripening and maturity of plant
-it is necessary for germination of seeds

6ei)
Courtship behaviour refers to the instructive behaviour on response to certain external stimuli in animals.It is the pattern of behaviour that preceeds mating and reproduction in animals.It is performed by male and female organism

6eii)
-pairing
-Teritoriality
-Display

6f)
-Holozoic nutrition
-Amoeba
-Entamoeba histolytica
-Humans

6g)
Crime detection using finger print method: this applies to forensic.In this method,individuals having different finger print pattern can be identified using database of stored information of such individuals.These method correctly identifies such individuals aptly and is useful in crime detection
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