Class 10th geography Unit 1 Physical Geography Questions Answers solutions||pdf download ||
TEXTUAL QUESTIONS AND ANSWERS
Q. No 1- 8
Ans
1 What is landform?
Ans. The varied features on the
surface of the earth are known as landforms. Examples of landforms includes
mountains, hills, plateaus, plains, valleys, rivers, sand dunes, glaciers,
oceans, etc.
2. Define geomorphology.
Ans. The particular branch of
geography which studies the origin, evolution, morphology and distribution of
the various landforms over the earth's surface is known as geomorphology.
3. Write down the meaning of the
geomorphic processes.
Ans. The processes by which
landforms are developed on the surface of the earth as a result of the
interaction of certain exogenic and endogenic factors are known as geomorphic
processes. For example, the works of winds and glaciers are two geomorphic processes.
4. Mention the exogenic processes
or factors.
Ans. The external factors or
processes which bring about various of changes on the surface of the earth are
known as exogenic processes or factors. The important exogenic factors ace
sunshine. wind, rainfall, rivers, glaciers, ocean waves, currents, temperature,
etc.
5. What do you mean by the term
'deflation'?
Ans. Deflation is the process of forming lowlands
in the desert as a result of the
transportation of loose sand, dust particles and other materials from
the surface level of the desert, by the erosion activity of wind.
Geography Class 10 Chapter 1 Question Answer.
6. What is
inselberg? Explain with diagram.
Ans.
Inselberg refers to a prominent steep-sided low hillock of solid rock, rising
abruptly from a plain of low relief, formed by the abrasion action of wind
erosion. Inselbergs have a dome-shaped cap. The upper part of inselberg is
steeper due to higher intensity of the wind here than at its lower part.
Inselbergs ace seen in deserts noted for high velocity winds.
7. What is oasis? What is its
significance?
Ans. Oasis is a fertile area in
the desert region usually having small, isolated spring and little vegetation.
With the transportation of materials to other pans of deserts by wind, some
areas may be lowered down almost to the level of underground water giving rise
to some depressions; this area is termed as oasis.
Oasis are patches of water and
vegetation in arid and sandy land. hence their presence is very significant in
providing a place for settlement, scope for agriculture and development of
economic activities. People can also travel through deserts as the occasional
oasis gives them the required water, shade, etc.
8. What are sand dunes? How are
they formed?
Ans. Sand dunes
refer to a mound or ridge of wind-blown sand. The dunes are generally mobile as
they move with the wind. There is a wide range of variation in the shape, size
and structure of different types of sand dunes, which depend on various factors
like properties of wind, wind direction and energy, vegetative cover, surface
structure, etc.
Formation of sand dunes:
There are three categories of
sand dunes in deserts. These are:
A) Longitudinal sand dunes: These
sand dunes are formed longitudinally along the direction of wind.
B) Transverse sand dunes: These
sand dunes are formed transverse to the wind direction.
C) Barkhans sand dunes: Some sand
dunes are formed having a shape of crescent. These sand dunes are called barkhans sand dunes.
Sand dunes are formed due to the
depositional activities of wind in the desert areas.
Due to deflation, the dust, sand
and clay particles are carried away by the wind. In the desert areas, the wind
blows with greater velocity due to the absence of any high raised landforms.
But, when such wind meets an obstruction, viz. bush, a fencepost or a large
rock, the speed of the wind gets reduced, and it starts depositing the sand and
dust fragments on the leeward side of such obstacles. The initial deposition
then acts as an obstruction which facilitates subsequent deposition. In due
course of time, the area starts gaining height which results. In the formation
of sand dunes. Sand dunes are predominantly found in deserts with sandstones.
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