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Importance of soil in agriculture - class-VI

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Soil is the component of

  1. Atmosphere

  2. Lithosphere

  3. Hydrosphere

  4. Exosphere


Correct Option: B
Explanation:

The lithosphere is the solid portion of the Earth. It is a dense shell of material, that surrounds the entire planet. Even though most of the Earth's surface is covered with water, underneath, that water is a solid layer of rock. With the exception of ice, basically any solid non-organic material on the Earth is from the lithosphere. This includes soil, rocks, sand, etc.

Which of the following is the important natural resources for plants and animals?

  1. Coal

  2. Petrol

  3. Diesel

  4. Soil


Correct Option: D
Explanation:

Soil, as we know an important abiotic component of our environment. It provides nutrition and water to grow crops. They hold the roots of the trees and are extremely necessary for the proper growth of plants and trees. In the absence of proper nutrients in the soil, the plants and trees show nutritional deficiencies and retarded growth.

Apart from this, animals depend on plants for their survival and so they are dependant on soil for providing habitat and proper development of plants that they consume.
Coal, petroleum and natural gas are important fossil fuels that also from non-renewable resources that are used for various reasons like running automobiles, house gas cylinders etc.

They are remnants of dead plants and animals over a long period of time. So, they are not related to the growth of plants and animals.


Soil helps plants by

  1. Supplying them water and minerals.

  2. Supplying them air.

  3. Preparing food in their plants.

  4. Helping them move from one place to another.


Correct Option: A
Explanation:

The roots of the plants are held firmly in the soil. Different types of soil have different texture and particles. They have different levels of minerals and nutrients embedded in them. Roots absorb water from the soil by the process of osmosis. Along with water, mineral nutrients also enter the soil.

So, we can say that option A "Supplying them water and minerals" is the correct answer. 

Tectonics is the study of .................

  1. Volcanos

  2. Earth's crust

  3. Sand dunes

  4. Sun


Correct Option: B
Explanation:

Tectonic is the study of the earth's crust. Tectonics is concerned with the processes which control the structure and properties of the Earth's crust, and its evolution through time. It was considered that earth was made up of tectonic plates. Tectonics also provides a framework to understand the earthquake and volcanic belts which directly affect much of the global population. Tectonic studies are important for understanding erosion patterns in geomorphology and search for petroleum and metallic ores. 

Therefore, the correct answer is option B.

Mulching helps in

  1. Soil fertility

  2. Moisture conservation

  3. Improvement of soil structure

  4. Soil sterility


Correct Option: B
Explanation:

Mulching refers to covering of harvested field with plant litter or polythene of low density, in order to decrease run off, prevent growth of weeds and retention of water.

Which of the following pairs is mismatch?

  1. Pedology - Study of soil 

  2. Physiology - Study of processes and functions of life

  3. Kinesiology - Study of fossils

  4. Limnology - Study of fresh water ecosystems


Correct Option: C
Explanation:

  • Pedology is the study of soils in their natural environment. It is one of two main branches of soil science.
  • Physiology is the branch of biology that deals with the normal functions and processes of living organisms and their parts.
  • Kinesiology is the scientific study of human or non-human body movement. Kinesiology addresses the physiological, biomechanical, and psychological dynamic principles and mechanisms of movement.
  • Limnology is the study of the biological, chemical, and physical features of lakes and other bodies of fresh water.
So, the correct answer is 'Kinesiology - Study of fossils'.

The top most layer of the earth that supports life is called as

  1. Rocks

  2. Soil

  3. Air

  4. Water


Correct Option: B

Pedology is science of

  1. Earth

  2. Soil

  3. Diseases

  4. Pollution


Correct Option: B
Explanation:

Pedology is the study of soils in their natural environment. It is one of two main branches of soil science, the other being edaphology. Pedology deals with pedogenesis, soil morphology, and soil classification, while edaphology studies the way soils influence plants, fungi, and other living things. The quantitative branch of pedology is called pedometrics. Hence, pedology is the science of soil.

So, the correct answer is 'soil'.

Edaphic factors are related to

  1. Soil

  2. Animal

  3. Man

  4. Temperature


Correct Option: A
Explanation:

(a) Soil; because man and animals are biotic factors and temperature is climatic factor.

Edaphology is

  1. Study of snakes

  2. Study of amphibians

  3. Study of elephants

  4. Study of soils


Correct Option: D
Explanation:

Edaphology is concerned with the influence of soils on living things, particularly plants. It includes the study of how soil influences humankind's use of land for plant growth as well as man's overall use of the land. It is one of two main divisions of soil science, the other being pedology. Hence, edaphology is the study of soils.

So, the correct answer is 'Study of soils'.

The uniform peeling away of the soil surface by the action of flowing water is called _____________.

  1. Slip erosion

  2. Till erosion

  3. Accelerated erosion

  4. Sheet erosion


Correct Option: A

Which one of the following pairs is NOT correctly matched?

  1. Therophytes - Surviving buds lies well above the soil surface

  2. Cryptophytes - Surviving buds lie under soil surface

  3. Hemicryptophyte - Surviving buds lie on the soil surface

  4. Chemiphytes - Surviving buds lie close or above the soil surface


Correct Option: A

Top soil contains which of the following?

  1. Humus and living organisms only.

  2. Humus and soil particles only.

  3. Humus, living organisms and plants.

  4. Humus, living organisms and soil particles.


Correct Option: D
Explanation:

Top soil is the topmost and outermost layer of the soil, which is usually 2 inches to 8 inches layer. It is generally dark in colour due to humus, i.e., partially decayed organic matter, soil particles and living organisms as soil bacteria etc. 

Choose the correct answer from the alternatives given.
The fertility of soil is reduced by

  1. ammonifying bacteria

  2. denitrifying bacteria

  3. nitrifying bacteria

  4. nitrogen fixing bacteria


Correct Option: B
Explanation:

Decomposers also break down the bodies of dead organisms resulting in nitrogen being returned to the soil as ammonia. In some conditions, denitrifying bacteria in the soil break down nitrates and return nitrogen to the air. This is usually in waterlogged soil. Hence, making it unavailable for plant roots. So, the correct option is 'Denitrifying bacteria'

Formation of plains is an example of

  1. Extrinsic

  2. Intrinsic

  3. Both A and B

  4. None


Correct Option: A
Explanation:

The forces like exogenic and endogenic can create a lot of landforms. Examples include Mountains, Plateaus, and Plains.

So, the correct option is 'Extrinsic'.

Soil contains : 

  1. Waste material

  2. Humidity

  3. Rocks

  4. Minerals


Correct Option: D
Explanation:

Soil contains minerals because they are made up of rocks by the process of weathering.

Models of vegetables are made with this soil :

  1. Sandy

  2. Sticky

  3. Rocky

  4. All the above


Correct Option: A

___________ is a source of all minerals

  1. air

  2. water

  3. wildlife

  4. soil


Correct Option: D

The lower limit of water availability is soil is known as

  1. Field capacity

  2. Hypolimnion

  3. Thermocline

  4. Wilting point


Correct Option: D

Which one is the main source of minerals essential for man and other organisms?

  1. Lithosphere

  2. Ionosphere

  3. Mesosphere

  4. Stratosphere


Correct Option: A
Explanation:

The lithosphere serves as a source of minerals. The minerals supply the basic materials, required for making a variety of commodities, which man uses daily. The lithosphere is also the major source of fuels, such as coal, petroleum and a natural gas. 

The lithosphere in combination with the hydrosphere and the atmosphere plays a vital role in the growth of plants and animals. It provides nutrients to the plants. The plants are the source of food for man and all other animals.

Materials of biological origin which are commonly used to maintain and improve soil fertility are 

  1. green manures

  2. biofertilizers

  3. bioinsecticides

  4. both (a) and (b).


Correct Option: D
Explanation:

Green manures are added to the soil to increase the productivity. Manures is of natural origin. The presence of nutrients in manure have a great role in increasing soil fertility. Biofertilizers are organisms which enrich the soil with nutrients e.g., Rhizobiumin symbiotic association with legume plants.

Soil is a component of

  1. Lithosphere

  2. Hydrosphere

  3. Atmosphere

  4. None of above


Correct Option: A
Explanation:

Lithosphere is the outer solid crust of Earth, which we call land. Its upper weathered part forms the soil.

When large patches of forests are being cleared for cultivation of crops, the environmental impact of such a practice would lead to______

  1. Soil erosion

  2. Soil conservation

  3. Soil pollution

  4. Soil fertility


Correct Option: A
Explanation:

 Deforestation is a direct cause of the erosion happening in tropical rain forests. Once plant cover is gone there are no roots to hold the soil in place during heavy tropical rains, which then wash away the topsoil and the nutrients necessary to regenerate future vegetation.

The four main bases in a soil are

  1. Calcium, magnesium, sodium and potassium

  2. Vitamins A, B, C and D

  3. Nitrogen, Phosphorus, Iron and Potassium

  4. Magnesium, Vanadium and Iron and Aluminum


Correct Option: C
Explanation:

As rock becomes broken down through a variety of processes, such as weathering and erosion, the particles become ground smaller and smaller. The four main bases in a soil are Nitrogen, Phosphorus, Iron and Potassium.

The soil is a complex mixture of

  1. Soil biota

  2. Eroded rock

  3. Gases and water

  4. All of the above


Correct Option: D
Explanation:
  • The soil is the mixture of minerals, organic matter, gases, liquids, and the countless organisms that together support life on Earth. 
  • The soil is a natural body known as the pedosphere and which performs four important functions. It is a medium for plant growth. 
  • It is a means of water storage, supply, and purification. 
  • It is a modifier of Earth's atmosphere. 
  • It is a habitat for organisms, all of which, in turn, modify the soil.
So the correct answer is 'All of the above'.

What is a soil horizon?

  1. A factor influencing how soil is formed

  2. A layer of soil

  3. An organism found within the soil

  4. A technique used to map soils


Correct Option: B
Explanation:

Explanation: Virtually all soil profiles are composed of a number of distinctive layers, termed horizons, interpretation of which is the key to understanding how the soil has formed.

The component of environment which is essential for agriculture is

  1. Air

  2. Fertilizers

  3. Soil

  4. None of the above


Correct Option: C

The renewable natural resource is

  1. Petrol

  2. Coal

  3. Soil

  4. None of the above


Correct Option: C
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