Nabteb 2017/2018 biology objectives and theory ,solution is ready now for question and answer Blackloaded

Nabteb 2017/2018 biology objectives and theory ,solution is ready now for question and answer

Verified bio obj.

1ABDCCBBBCA 

 11DADBCCABDB  

21BBBCDBDAAA

 31CBACBCDCBD

 41CDDBBBBDCD

=====

1a.
i.cell is the basic unit of all living organism e.g amoeba,paramecium,chlamydomous,protozoa,bacteria
ii.tissue-this is refers to as similar cells that are performing a specific function e.g muscle,epittelia tisue algae,fungi,sponges,coelentrata
iii.organ-these are saveral type of tissue,capable of carrying out a specialized function e.g heart,kidney,flatworms,mosses
iv.system-these composed of functional related organs which are performing a specific function. e.g circulatory system, transport system, excretory system

b.Animal like characteristics
-absence of cellulose cell wall
-posession of contractile vacuole
-it has pellicle
-possession of myonemes and typical euglenoid movement
possession of a gullet with splinted

ii.plant like characteristics
-it has cholorplast
-presence of pyrenoids which are starch granules
-utilization of nitrates and amonnia for nitrogen requirement
-the shape exihibits the palmella forms
-holophytic mode of living
-it undergoes asexual reproduction
1C
DIAGRAM

2a.  Erosion is the washing away of the topmost soil
b. soil organisms e.g earthworms
-soil water
-air
organic matter e.g death plant, death animal
Blackloaded
2c. how it can be reduced
-deforestration
-overgrazing
-soil erosion
-removal of cover crop
ii.HOW IT CAN BE INCREASED
application of fertilizer
-afforestration
crop rotation
planting of cover crop

3. DIAGRAM

3b.IN A TABULAR FORM
mitosis
-it results to two daughter cells
-occur during growth of somatic cells
-chromosome number of parent and daughter cells is the same
-no crossing over occur
-offspring produced by mitosis are exact repticates or clones of the parent organism
-the chromosomes and their genes in each daughter cell is identical
MEIOSIS
-it result to four daughter cells
-occur during gamete formation
-chromosome number of daughter cells is half the number in the parent cell
-crossing over occurs.
offspring produced by meiosis in sexual reproduction will show variations among themselves and their parents .
-the chromosomes and the genes in the four daughter cells are not identical

3c.to test for the presence of starch in a leaf
-detarch a green leaf from the parent plant
-place leaf in boiling warter for half a minutes to kill it .
-decolorise leaf by placing it in hot alcohol
-dip decolorized leaf in hot water to soften it .
-place leaf on tile and add iodine solution to it.
when iodine is added and leaf become blue black ,it shows that starch is present but it turns light brown if starch is absent

4a.
i. Amoebe–>body surface
ii.mosquito larva–>
iii.insects—>trachea
iv.flowering plants —>stomata
birds —>lungs
lizard–> lungs
dog –>lungs
Blackloaded
4b.
tissue respiration is refer to as cellular respiration .it is the type of respiration which involves exchange of gas within and among the cells of an organism in the absence of oxygen

Blackloaded