Tag: soil - formation, profile and properties

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Questions Related to soil - formation, profile and properties

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sheet erosion is defined as the uniform removal of a thin layer of soil from the land surface by runoff water. Unlike rill or gully erosion, it does not create distinct channels.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A is incorrectly matched - Therophytes are annual plants with surviving buds above soil, not 'well above'. Cryptophytes have buds underground, Hemicryptophytes have buds on soil surface, and Chamaephytes have buds at ground level.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

Models of vegetables are made with this soil :

  1. Sandy

  2. Sticky

  3. Rocky

  4. All the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sticky soil, which contains a high proportion of clay, is pliable and retains its shape well, making it ideal for molding models of vegetables. Other soil types lack the necessary cohesion and plasticity for fine modeling work.

Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

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

  1. Lithosphere

  2. Ionosphere

  3. Mesosphere

  4. Stratosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
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.