Question

These fibers are shiny and easily washable.

 These fibers are made from chemical substance.

 These fibers are made from wool, jute etc.

 Polyster is made from these fibers.

 These fibers are strong and light.

 These fibers are relatively less strong.

 Vegetable material is used to make these fibers.

 These fibers are not harmful to the environment.

(B) Classify the below given properties for unicellular organisms and multicellular organisms. (3)

 Its body is made up of more than one cell.

 It has an organ or organ system.

 It does not contain tissue.

 Fish is an example of this.

 Euglena is an example of this.

 Its body is made up of a single cell.

Q-2 Explain the difference on the basis of properties (9)

(1) Thermosetting plastics and thermoplastics.

(2) Physical properties of metals and non metal physical properties.

(3) Useful micro organisms and harmful micro organisms.

Q-3 Do as directed. (10)

(1) How do microorganisms increase soil fertility ?

(2) Which activity would you do to prove that the temperature of a substance must reach

the combustion point of that substance in order to ignite it?

(3) How is petroleum made up ?

(4) Collect information and make a note on how food is preserved in your home.

(5) Make a note on which microorganisms are used in your home to make different dishes?

Q-4 Answer correctly. (9)

(1) How does the vaccine help to prevent disease?

(2) Why do birds migrate?

(3) Which irrigation system is useful in water scarcity area ? Why ?

Q-5 State the microorganisms responsible for the following diseases and their mode of

transmission. (5)

(1) Cholera (2) Malaria

Q-6 Do as directed. (10)

(1) Explain – Threshing

(2) Which part of the flame does goldsmith use to make jewellery ? Why ?

(3) Why is phosphorus kept in water?2

(4) How is sex determined of a foetus?

(5) Write a short note : Cell nucleus.

Q-7 (A) Do as directed.

(A)Explain the process of casting iron nails in solution of CuS04. (including chemical equation) (3)

(B) Which product is formed from the below given process. Show the process through the

chemical equation. (2)

(1) Sulphur dioxide + water

(C) Complete the equation.

(1) 2Cu + H2O + CO2 + O2

. . . . . .. + CuCO3

(1)

(2) S + O2

. . . . . . . . . . . . (1)

Q-8 Draw a figure and name it. ( Any One) (5)

(1) Animal cell

(2) Female Reproductive System

Q-9 (A) Do as directed. (6)

(1) How will you protect wild animals, birds and plants ?

(2) Why does the farmer cultivate the land?

(3) Which fuel would you choose as a better fuel from petrol or CNG ? Why ?

(B) Answer in one sentence. (2)

(1) Which tool is used to remove weeds in the field ?

(2) Which tool is used to break the lumps of soil in the field ?

Q-10 (A) Do as directed. (6)

(1) Give your suggestions to prevent air pollution.

(2) Explain the benefits of planting new trees in proportion to the number of cut trees ?

(B) Fill in the blanks by selecting appropriate option. (4)

(1) . . . . . . . . . gas is responsible for global warming. (Oxygen, Nitrogen, Carbon

dioxide)

(2) …………………….. gas is present in acid rain. (Biogas, Sulphur dioxide, Carbon dioxide)

(3) . . . . . . . . . fuel is less polluting. ( LPG, Dung cake, Wood.)

(4) Plastic is a …………………. substance and should be used wisely. (non biodegradable,

biodegradable, biological)​

Answer 1

Answer:

(ii) हम एक जगह खाने पर चले गए थे। (सामान्य भविष्यकाल) ( iii) पिछले महीने उमा की आँखें दुखने लगी। (पूर्ण भूतकाल).

Answer 2

Answer:

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