Question

Q6) Write short note on plastics?

Q7) Write some chemical properties of Metals?

Q8) Describe how coal is formed from dead vegetation? What is this process called?

Q9) Explain the process of formation of petroleum?

Q10) Draw a labelled diagram of a candle flame?

Q11) Why should we conserve Biodiversity?

Q12) Define asexual reproduction?

Q13) Describe two methods of asexual reproduction in animals?

Q14) What is meant by exhaustible and inexhaustible natural resources?

Q15) Very short answer questions: -

a) What is red data book?

b) what is deforestation?

c) Where are chromosomes found in a cell? State their functions?

d) What will happen if we go on cutting the trees? ​

Answer 1

Answer:

6) A plastic is a material that can change its shape. Many things are made of plastics, usually because making them to the right shape is easy. There are many types of plastic. Some can be shaped only when they are freshly made; then they become hard. Others are thermoplastic and can be softened by heating them. These plastics can be used for 3D printing, because the plastic will become soft enough to form into different shapes, and then become hard again when they cool down.

7) Chemical Properties of Metals

They have lustreand a metallic appearance.

They are usually in the form of a solid at room temperature.

They are very good conductors of electricity and heat.

Metals are malleable and ductile.

They mostly have a very high melting point.

12) Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction from a single cell or from a multicellular organism inherit the genes of that parent.

15 b) Deforestation refers to the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization, or mining activities. Greatly accelerated by human activities since 1960, deforestation has been negatively affecting natural ecosystems, biodiversity, and the climate.

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