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Biology Obj:
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11CDBDCBBABA
21CBCCDBCDDC
31CBAADCCABA
41CABADDDBDC
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*BIOLOGY ANSWERS*
1ai) Classifications of living things consists of placing together in categories those living things that resembles each other. It involves placing living things into groups that have certain features in common which distinguish them from other groups
1aii) Car von LinnĆØ Also known as Carolus Linnaeus
1aiii)-Classification is important because it allows scientists to identify the organisms
-Classification is important because it makes it easy for scientists to group the organisms.
- It is also good to properly name organisms via a standardized system
1aiv)-Kingdom
- Phylum(Animal) or division (Plant)
-Class
-Order
-Family
-Genus
-Species
1bi) -VĆrus can reproduce when present in another living cell
-It possesses characteristics which can be transmitted from one generation to the next
1bii) -When a virus is extracted from a living cell and placed in a non living medium, it assumes a crystalline form and thus become non-living
-Virus cannot respire, excrete or respond to stimuli
1ci) -Rosette disease
- Cassava mosaic disease
1cii) -Chicken Pox
-Polio
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2a)i They catalyse reactions by lowering the activation energy of a reaction
ii). They are regenerated after each reaction
iii). They are substrate specific, hence only molecules which are complementary to their shape can bind to it.
iii). They aid in metabolism (anabolism and catabolism)
2bi)-Pancreatic lipase
- Amylase
2bii)-Fats and oil
-Starch Maltose
2biii) -It converts fat and oils to fatty acids and glycerol
-It converts starch to maltose
2ci)Chlorophyll is necessary to absorb the radiant energy of the sun to synthesize sugar during photosynthesis
2cii)-Magnessium
-Iron
2ciii) Magnessium --->Yellowing of leaves and poor growth
-Iron--->Yellowing of leaves and poor growth
2d) -Take a freshly plucked green leaf and boil it for about 5minutes to kill the cells of the leaf and to burst the starch grains in the cells of the leaf
-Boil the boiled leaf in ethanol to remove the chlorophyll(i.e.decolourizes)
-Dip the decolourized leaf in warm water to soften it
-Wash the leaf in tap water to remove traces of ethanol in it
-Pour iodine solution on it and allow to stand for some minutes
-If the leaf turns blue-black,it contains starch
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3C)
Commensalism
Parasitism
Mutualism
3 i)
Commensalism is a type of relationship where one of the organisms benefits greatly from the symbiosis. The other is not helped but is not harmed or damaged from the relationship. In other words, this is a one-sided symbiotic relationship.
3 ii)
In parasitism, one organism benefits from the relationship but at the expense of the other. The organism may live inside the other’s body or on its surface.
In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.
3 iii)
Parasitism
In parasitism, one organism benefits from the relationship but at the expense of the other.
The organism may live inside the other’s body or on its surface. In some of these parasitic relationships the host dies and in others, it is important that the host remain alive.
6a)
The odorous molecules come into contact with the olfactory epithelium at the top of the nasal cavity and stimulate multiple chemically cell receptors and thus the odour is transmitted to the brain. There after the brain interprets the type of smell.
6b)
i)Shell
ii)Membranes
iii)Airspace
iv)Albumen
v)Yolk
vi)Chalaza
6ci) An autotroph or producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.
6cii) -Algae
-Green plants
6d)1. Providing leadership on matters critical to health and engaging in partnerships where joint action is needed;
2. Shaping the research agenda and stimulating the generation, translation and dissemination of valuable knowledge;
3. setting norms and standards and promoting and monitoring their implementation;
4. Articulating ethical and evidence-based policy options;
5. Providing technical support, catalysing change, and building sustainable institutional capacity;
6. Monitoring the health situation and addressing health trends
6e) Plants --->Water lettuce
---->Sword grass
Animals --->Tadpole
------>Crayfish
6gi) -Plot A-Since the maize are all same species equal competitions of nutrients would take place
6gii)Plot B-They are of different species so the maize will highly compete with the pepper on nutrient and sunlight
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