Download [Final Revision Third Prep.

Model Answer Final Revision
 Complete the following sentences:
1.
2.
3.
4.
5.
6.
7.
Fertilizers – fibers
Sulpher trioxide – carbon dioxide
Simple substitution – chemical activity series
Descending – activity
Sodium hydroxide – hydrogen gas
White – silver chloride
a. Reduction – oxidation
b. oxidizing agent – reducing agent
8. oxidizing agent
9.
a. lost – positive
b. gained – negative
c. oxidation – reduction
10. directly – potential difference (inversely – electric resistance)
11. Ammeter – Ampere
12. Higher – lower
13. E.m.f (potential difference ) – volt
14. Voltmeter – volt
15. Direct current – alternating current
16. Mechanical – electric
17. Direct – alternating
18. Joule – coulomb
19. Series – parallel
20. Endocrine glands
21. Hormone
22. Gigantism
23. Glucagon
24. Insulin
25. DNA
26. Dark eye color – curly hair – colored eyes – straight hair
27. Enzyme – protein
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28. Somatic – reproductive
29. Endocrine glands
30. Pituitary
31. Pituitary
32. Adrenalin – emergencies
33. Ovaries – estrogen – progesterone
34. Calcitonin – thyroid
 Write the scientific term:
1. Chemical reaction
2. Thermal decomposition
3. Simple substitution
4. Double substitution
5. Reducing agent
6. Oxidation process
7. Reducing agent
8. Electric current
9. Ampere
10. Electric current intensity
11. Ammeter
12. Electric potential
13. Volt
14. Electric resistance
15. Ohm
16. Direct current
17. Alternating current
18. Ohm’s Law
19. Joule
20. Rheostat
21. Genetics
22. Gene
23. Dominant trait
24. The principal of complete dominance
25. Chromosome
26. Gene
27. Acquired trait
28. Mutation
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29. Hormones
30. Endocrine glands
31. Feedback mechanism
32. Hormonal disorder
33. Pituitary gland
34. Thyroxin
35. Testosterone
36. Calcitonin
37. Iodine
38. Spontaneous
39. Simple goiter
40. Diabetes
41. Dwarfism
42. Progesterone
43. Glucagon
44. Guanine
45. Blood stream
 Justify (Give reason) the following:
1. Bec: magnesium comes before copper in the chemical activity series.(more active)
2. Bec: magnesium substitute copper and reddish brown color of copper ppt. is formed
Mg + CuSO4
MgSO4 + Cu
3. Due to formation of hydrogen gas 2Al + 6HCl
4.
5.
6.
7.
Dil.
2AlCl3 + 3H2
Bec: they contain large amount of folic acid that helps in the growth of cells.
Because it reacts with air forming calcium carbonate
To determine the e.m.f of the battery
Bec: its intensity and direction can be controlled and it can be transmitted to long
distances.
8. To obtain the highest E.m.f
9. to obtain the lowest e.m.f
10. Bec: during connection in series the e.m.f equal the total e.m.f for all cells, but during
connection in parallel the total e.m.f. equals the e.m.f of one cell only.
11. Bec: it changes the resistance by changing the length of the wire in enclosing inside the
circuit.
12. Bec: 1. Easy to be planted.
2. Its life cycle is short. 3. Gives large number of
plants in each generation. 4. Carry pairs of contrasting traits.
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13. To prevent pollination with another plant
14. Bec: the green pod is a dominant trait appears completely in the first generation but the
yellow pod is a recessive trait disappears completely in the first generation.
15. Bec it appears completely in the first generation and in the second generation it appears
by a ratio 3:1.
16. Bec: it appears completely in the first generation and in the second generation 75%
17. Bec: they occurred in the somatic cells not in the reproductive cells.
18. Bec it secretes stimulating hormones that control the function of other glands.
19. Bec: it acts as associate gland in the digestive system to digest fats and act as endocrine
gland that secretes hormones (insulin, glucagon) to control the concentration of sugar in
the blood.
20. Bec: it secretes thyroxin hormone.
21. Bec: they secrete the adrenalin hormone.
22. Due to the increase in the secretion of the growth hormone in childhood
23. Due to the decrease in the secretion of the growth hormone in childhood
24. Due to the decrease in the secretion of insulin hormone
25. Due to the increase in the secretion of thyroxin hormone from thyroid gland
 Illustrate by balanced chemical equations the following reactio∆ns:
1. 2HgO
∆
2Hg + O2
2. 2NaNO3
∆
2NaNO2 + O2
3. H2O + 2Na
2NaOH + H2
4. Zn + 2HCl
ZnCl2 + H2
5. 2Al + 6HCl
Dil.
2AlCl3 + 3H2
6. Mg + CuSO4
MgSO4 + Cu
7. 2Na + 2H2O
2NaOH + H2
8. Ca(OH)2 + 2HCl
CaCl2 + 2H2O
9. AgNO3 + NaCl
AgCl + NaNO3
10. CuO + H2
Cu + H2O
 Compare between:
1.
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Heating of metal sulphate
-
Produces metal oxide and sulpher
trioxide
-
CuSo4
∆
CuO + SO3
-
Heating metal hydroxide
Produces metal oxide and water
vapout
-
Cu(OH)2
∆
CuO + H2O
2.
Simple substitution reaction
Double substitution reaction.
The reaction in which a metal replaces another
in its solution as it is higher in chemical activity.
The reaction in which two radicals in two
different compounds exchange together to
produce two new compounds.
3.
Oxidation
Oxidizing Agent
The substance that gains an electron or more.
The process in which an element loses an
electron or more.
4.
Point of comparison
Use:
Unit:
Connection:
Voltmeter
Measures the potential
difference of a conductor
ammeter
Measures the electric current
intensity
The e.m.f of a battery
Volt
Ampere
In parallel
In series
Symbol:
5.
Point of comparison
Definition:
Usage:
Direct current
The current that has fixed
intensity and direction
Electroplating
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Alternating current
The current that has variable
intensity and direction
Operating machines and
electric appliances
6.
Point of comparison
Series connection
Parallel connection
The positive pole of a cell is
connected to the negative cell
of the other cell and so on…..
Connection:
Etotal = E1 + E2 + E3
The e.m.f:
The positive poles of the three
dry cells are connected
together and the negative poles
of the three cells connected
together.
Etotal = E one cell
7.
Testes
Ovaries
Secrete estrogen hormone:
Responsible for the appearance of the
secondary sex characters in female.
Secrete progesterone hormone:
Responsible for the growth of the endometrium.
Secrete testosterone hormone:
Responsible for the appearance of the
secondary sex characters in male.
8.
Mutation in the reproductive cells
Mutation in the somatic cells
Can't be transmitted to the offspring.
Can be transmitted to the offspring.
9.
Induced Mutation
Spontaneous Mutation
Is produced due to interference of human to
produce more desirable traits in some plants.
Is produced without the interference of human.
By: x-rays, nuclear rays, very high or low
temperature.
10.
Inherited traits
Acquired traits
The traits that can't be transmitted from the
parents to the offspring.
The traits that can be transmitted from the
parents to the offspring.
11.
Dominant character
Recessive character
The trait that disappears completely in the first
The trait that appears completely in the first
generation and appears in the second
generation and appears in the second generation generation by ratio 3:1.
by ratio 3:1.
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 Using symbols to express the results produced from crossing between each of
the following:
1. A pea plant of white flower and another of purple flowers.
2. A pea plant of tall stem and green pod color and another one of short stem and yellow
pod color. [Illustrating: parents – gametes – first generation – second generation in each
crossing].
 If two pea plants, one with hybrid red color flower and the other with white
flower are crossed. Explain on genetic bases the results of this crossing and the
ratio of the red flowered plant to the white flowered plant.
 Explain how the gene performs their function?
Each gene has a certain code
this code secretes an enzyme
catalysis a certain reaction chemical reaction
produces a specific
protein
for a certain trait
 What happens?
1.
2.
3.
4.
5.
The percentage of blood sugar will decrease.
The man will be infected with exophthalmic goiter.
The man will be a giant. (gigantism disease)
The man will be infected with diabetes disease.
All their offspring's will carry the same trait.
 Draw a labeled diagram shows the relation between the hormone secretion
which activate thyroid gland and thyroxin hormone.
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 Write the components of the nucleotide?
De-oxy-ribose sugar – nitrogenous base – phosphate group
 Draw a labeled diagram shows the mechanism of feeding back control sugar
blood concentration with the internal environment of human body which keeps
its balance.
 Write one economic importance for each of the following:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Polishing metals and cleaning surfaces
Car batteries and oil distillation
fertilizers
anti-acidity medicine for stomach
in civil works
salting food
glass industry
explosives
sensitive camera film
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