Question

E. - Answer the following Question in one sentence.
(1) State the stages of life history of silk moth.
(2) What are burrs?
(3) What is heat?
(4) What is sea breeze ?
(5) How are bases to taste and touch?
(6) What is rusting of iron ?
(7) What are included in the physical properties of a substance?
(8) What is the land breeze?​

Answer 1

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1. The life cycle of silk moth starts when a female silk moth lays eggs. The caterpillar or larvae are hatched from the eggs of the silk moth. The silkworms feed on mulberry leaves and give rise to pupa. In the pupa stage, a weave is netted around by the silkworm to hold itself. After that it swings its head, spinning a fibre made of a protein and becomes a silk fibre. Several caterpillars form a protective layer around pupa and this covering is known as the cocoon. The silk thread (yarn) is obtained from the silk moth’s cocoon.
2. Burrs are soft fluffy fibres in wool (similar to those that often appear on sweaters you wear). These are removed manually.
3. Heat is the form of energy that is transferred between systems or objects with different temperatures (flowing from the high-temperature system to the low-temperature system).
4. Sea breeze, a local wind system characterized by a flow from sea to land during the day. Sea breezes alternate with land breezes along the coastal regions of oceans or large lakes in the absence of a strong large-scale wind system during periods of strong daytime heating or nighttime cooling.
5. Bases are slippery to touch when in aqueous form. Generally, bases have a bitter taste. Bases produce hydroxyl ions (OH-) when mixed with water.
6. Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Here is the word equation for the reaction: iron + water + oxygen → hydrated iron(III) oxide.
7. A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.
8. The breeze that blows from the land toward the sea after sunset. The land cools more quickly than the ocean, cooling the air above it. The warmer air above the water continues to rise, and cooler air from over the land replaces it, creating a breeze.

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