Question

3.
Which part of the Jute plant is used to obtain its fibres? The
Is melting of ice a reversible change? Why?
Give an example of response of plant to stimulus.
What is meant by luminous ​

Answer 1

Explanation:

(a) The molecules of the substances do not change.

Physical changes are reversible, the molecules of the substance remain exactly the same before and after the physical change.

Answer 2

• The stem of jute plant is used to obtain it's fibre.

• Yes, melting of ice is a reversible change because ice melts due to increased temperature (room temp.) Melted ice can be solidified back by freezing it. Thus, it is a reversible change.

• The Touch me not plant is an example of plant which response to stimulus. whenever we touch this plant the leaves shrink.

• The objects which EMIT their own light are called luminous objects. Ex : Sun, Bulb, etc

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