Question

Q3) Answer any three of the following.
1) Distinguish between thermoplastic & thermosetting plastic.
b) What are the reasons of war?
c) Which are the main ingredients of glass?
d) Explain difference between Arteries & veins.
e) Write the name of suicide bag & storage sacs in cell.​

Answer 1

Explanation:

a ) Thermoplastic :

thermoplastic refers to a plastic polymer material that can become mouldable or pliable at a particular temperature. Furthermore, the solidification of thermoplastic happens upon cooling down. Moreover, the molecular weight of thermoplastics tends to be high.

Thermosetting plastic :

thermosetting plastic refers to a polymer that becomes rigid in an irreversible manner on the application of heat. Furthermore, such a material can also be called as a thermosetting polymer or thermoset. Moreover, such materials have polymers that, during the curing process, cross-link together so as to form an irreversible chemical bond.

c ) These are the common ingredients to obtain glass:

• Sand (SiO2 silica) In its pure form it exists as a polymer, (SiO2)n.
• Soda ash (sodium carbonate Na2CO3) ...
• Limestone (calcium carbonate or CaCo3) or dolomite (MgCO3)

e ) Lysosomes are cell organelles found in eukaryotic cells. They are also called as suicidal bags. They contains digestive enzymes and lysozymes which breaks down the waste material and foreign particles. They also destroys the cell after it has died.

Answer 2

Answer:

(a)Ans: THERMOPLASTICS THERMOSETTING

PLASTIC

1)Thermoplastic can be 1)THERMOSETTING plastic

moulded and reshaped. cannot be moulded or

2)Thermoplastic get reshaped.

softened on heating. 2)It does not get softened

3)Thermoplastic can be on heating.

easily bent. 3)It does not get easily

4)Thermoplastic are bent, if forced to break

expensive. it will break.

4)Thermosetting plastic is

cheaper than

Thermoplastic.

b) ANS: There are many reasons for war like

1)Difference of opinion in countries and compitition

over land, water, mineral resources, etc.

2) The other reasons for war can be economic and

political causes which led to the war among

countries.

3)Many a times a religious and ethnicity also cause

war.

c) ANS: The main ingredients of glass are as follows

Silica, Sodium carbonate, calcium oxide, boron.

d) ANS:

Arteries Veins

1) Arteries carry blood 1)Veins carry blood towards

away from heart. heart.

2)Arteries carry 2)Veins carry deoxygenated

oxygenated blood. blood.

3)It's location is deep 3)it's location is close to the

within the body skin.

4)The rate of blood flow 4)The rate of blood flow is

is quick. slow.

e)ANS: Lysosomes are called as suicide bags and vacoules are called as storage sacs in the cell