WAEC BIOLOGY OBJECTIVE AND THEORY ANSWER
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===Biology-OBJ===
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1 a i
i- free living
ii - As filament
iii - As colony
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1ai)
i- free living
ii - As filament
iii - As colony
1aii)
i- Amoeba
ii - spirogyre
iii -volvox
1b.) Diagram
1c i)
Plant cells
* has chloroplast
* has a large vacoule
*has a cell centrioles
* has definities shape
Animal cell
* has no cloroplast
* has a small vacoule
*has centrioles
* has no definite shape
3ai)
A habitat is an ecological or environmental area that is inhabited by a particular species of animal, plant, or other type of organism.
The term typically refers to the zone in which the organism lives and where it can find food, shelter, protection and mates for reproduction, utilizing the qualities the species has adapted to survive within the ecology of the habitat. It is the natural environment in which an organism lives, or the physical environment that surrounds a species population.
A habitat is made up of physical factors such as soil, moisture, range of temperature, and availability of light as well as biotic factors such as the availability of food and the presence of predators.
A habitat is not necessarily a geographic area—for a parasitic organism it is the body of its host, part of the host's body such as the digestive tract, or a cell within the host's body.
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(3ai)
A habitat comprises of an organism immediate environment or where it lives or resides
(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
9) i) Single independent free living organism. Eg. Amoeba
ii) As a colony. Eg. Volvox
iii) As a filament. Eg. Spirogyra
i) Amoeba
ii) Volvox
iii) Spirogyra
C)Plant cell
i) They are rectangular in shape
ii) They contain chloroplast
iii) The contain cell wall
iv) The nucleus is at the side
Animal Cell
i) They are spherical in shape
ii) They do not contain chloroplast
iii) They do not contain cell wall
iv) The nucleus is in the middle
II) i) They both contain nucleus
ii) They both have mitochondria
iii) They both have endoplasmic reticulum
