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Science Department
3ndprep.
Model Answer Radioactivity
*Complete:
1. Heneri Becquerel
2. Rem
*Scientific term:
1. ….
2. Rem
3. Radioactivity phenomenon
*Give reason for:
1. To prevent spreading of radiation in the environment
*State the contribution:
1. He discovered the radioactivity when he discovered unseen rays from the
uranium-235.
2. His theories are used as bases for making the atomic bomb.
*What’s meant by?
1. Unit of measuring the absorbed radioactivity.
2. It is Spontaneous conversion of nuclei of some radioactive elements to
achieve more stable state accompanied by emission of neutrons & radiations
(alpha – beta – gamma)
*Define:
1. It is Spontaneous conversion of nuclei of some radioactive elements to
achieve more stable state accompanied by emission of neutrons & radiations
(alpha – beta – gamma)
Medicine
Diagnose & Treat cancer
Agriculture
Eliminate pests – improve kinds of plants
Industry
Convert sand into silicon sheets (computers &
electronics)
Generating
Electricity
Nuclear energy used to heat water forming steam to
turn turbines & generate electricity
*Mention:
Answer 1 & 2
1) Don’t expose to radiation more than 5 rem each day.
2) Workers with radioactivity should wear special gloves, masks & clothes to
protect from radioactivity.
3) Radioactive waste should be kept away from the underground water.
4) Radioactive waste should be stored in safe place (no earthquakes or
volcanoes)
5) Radioactive waste should be stored away from animals in caves not to
spread the radiations in the environment.
6) Radioactive waste should be surrounded by cement layer and buried deep in
the ground away of the habitat areas.
7) Nuclear plants (reactors) shouldn’t throw water used in cooling in the seas &
lakes (some use artificial lakes).
3. It is Spontaneous conversion of nuclei of some radioactive elements to
achieve more stable state accompanied by emission of neutrons & radiations
(alpha – beta – gamma)
*Large dose for short time:
1. Damage of spleen, digestive & nervous system.
2. Damage of bone marrow responsible for formation of red blood cells leading
to  being sick – sore throat – nausea – vertigo – diarrhea.
*Give reason for:
Because it contains number of neutrons more than needed for its stability.
Science Department
3rd prep
Model answers(Science book)
Define each of the following:
1.Mendel’s first law (Low of segregation of factors):
When two individual of any hereditary traits are different form each other, only the
dominant trait appear in the first generation, while the two traits appear in the
second generation in a ratio 3:1
2.Mendel’s second law:
When two individuals bearing a pair or more of alternative traits are crossed, the
trait of each pair is inherited independently of the others, and appear in the second
generation with ratio 3:1
What happens in each of the following:
1.yellow seeds and green seeds appear in ratio 3 yellow :1 green
2.To prevent cross pollinate from other flower.
Choose:
1.a&c
Write the scientific term:
1. Gametes.
2. Mendel’s first low.
Model answer of genes.
*Define:1.Mutation :- is the change in the nature of hereditary factors that control the
hereditary traits of the living organisms which results in the change in the living
organism traits.
2.Gametes:-reproductive cells produced from the meiotic division and contains the
half no. of chromosomes.
3.Gene:- is the part of DNA that carries the hereditary traits of the living organism.
4.Nucleutide:- is the building unit of the gene that is consisting of deoxyribose
sugar, phosphate group and nitrogenous base.
*Complete the following:1.DNA , protein.
2.genetic, spontaneous.
*Put ( ) or (×):1. false
2. True
*Choose the correct answer:1. a
2. b
*Write the scientific term:1. Nucleutide
2. Genetic mutation
*State the contribution of the following scientists:1. Mendel:- states the laws of genetics.. how can the hereditary traits transferred
from the parents to their offsprings … and the traits are two contrasting and their
transfere ..
2.Watson and creek:- state the structure of DNA which is similar to the double
helix .
*Give reason for:- because the somatic mutation which is happened in the somatic cells is not
transmitted from parents in to their offsprings…
Model Answer Hormones
* Mention:
1. Diabetes
2. Prepares the body to face emergencies
3. Reduces the level of sugar in blood
* Scientific explanation:
1. Due to the deficiency in the secretion of growth hormone in childhood.
2. Bec insulin reduces the amount of sugar in blood through storing the excess
sugar in liver.
3. Bec it controls the function of other endocrine glands.
4. Bec it acts as endocrine gland to secrete insulin and glucagon hormones, and
as associated gland to the digestive system to secrete enzymes help in
digestion of fats.
* Complete:
1.
2.
3.
4.
Growth
Insulin
Pituitary – growth
Insulin – glucose
* Put (√) or (x):
1. (x) simple goiter
2. (x) gigantism
3. (x) ductless glands
* What is meant by?
1. Ductless glands that secretes hormones directly to the blood stream.
2. A disease occurs due to the deficiency of insulin hormone causing increasing
the level of glucose sugar in blood.
* Choose:
1.
2.
3.
4.
5.
6.
7.
Adrenalin
Estrogen
Testosterone
Thyroxin
Insulin
Calcitonin
Thyroid
* Scientific term:
1. Hormones
2. Endocrine gland
* Correct:
1.
2.
3.
4.
Estrogen
Pituitary
Feedback
Iodine
* What would happen ----?
1.
2.
3.
4.
Dwarfism disease
Simple goiter disease
The sugar level will increase in blood
Exophthalmic goiter disease
* Diagram showing the feedback mechanism for homoeostasis and
maintaining human sugar
* Diagram showing the relation between the secretion of the thyroid
stimulating hormone and thyroxin hormone
* Compare between:
1. The two testes and ovaries (in concern of their hormones and functions).
Gland
Hormone
Function
Testosterone
Responsible for the
appearance of the male
Testes
secondary sex characters
Estrogen
Responsible for the
appearance of the female
secondary sex characters ------------------------------
progestrone
Responsible for the
occurrence of pregnancy and
its continuity
Ovaries