How do you distinguish between the process of soil formation and soilforming factors? What is the role of climate and biological activity as two
important control factors in the formation of soils?
Boojho with perfect eyesight was finding it difficult to pass a
thread through the eye of a needle. What can be the possible
reason for this?
Once, Paheli visited a tailor shop and brought home some
cuttings of fabric to study their properties. She took two pieces
and found that one of the pieces were shrinking when it was
burnt with a candle. However the other did not shrink on
burning. Can you help her to find out which of the two was a
cotton fabric and which a silk fabric?
Are physical and chemical weathering processes independent of each
other? If not, why? Explain with examples.
The following is an answer given by Boojho to a question asked by his teacher— “Cotton, wool, silk and jute are classified as natural fibres whereas nylon and polyester are classified as synthetic fibres.” Can you tell what question the teacher has asked?
State whether the following statements are true or false. If
false, correct them.
(a) Silk is a plant fibre.
(b) Jute is obtained from the leaves of a plant.
(c) Weaving is a process of arranging two sets of yarn together.
(d) Cotton yarn on burning gives an odour similar to that of
a burning paper.
Some terms related to fabrics are jumbled up and given below.
Write them in their correct form.
(a) onttoc (b) sinnping (c) vingwea (d) bisref
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