Tag: soil profile

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Questions Related to soil profile

Multiple choice evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

Water holding capacity of the soil depends upon 

  1. Chemical composition of soil

  2. Particle size of soil

  3. Aggregation of soil particle

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The quantity of water soil can retain after flowing down of the gravitational water is called its filled capacity or water holding capacity. Its depends on chemical composition of the sol which means types of ions present and hence pH of the soil . Size of sol particles and their aggregation form pores in soil. Large pores take part in percolation of water in the soil but small pores hold water by capillarity. 

So, the correct answer is 'All of the above'.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

Which of the following are the substances that are present in the soil and required for the growth of crops?

  1. Manures

  2. Pesticides

  3. Fertilisers

  4. Nutrients
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We know that the growth of plants in the soil requires the presence of certain substances in it. This includes water and also nutrients present inside the soil.

Manures, as we know are prepared naturally by the process of decomposition of plant and animal bodies in the soi. They are not present in the soil but have to be prepared by composting and then added to the crop soil.
Pesticides are chemical substances that sprayed on the crop plants artificially to protect them from insect pests.
Fertilizers are also chemically prepared substances added to the soil to improves its nutritive value.
So, option D "Nutrients' is the correct answer.





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Multiple choice evs soil : our life soil profile soil- our life soil and crops

Which of the following crop is not grown in clayey soil?

  1. Wheat

  2. Gram

  3. Paddy

  4. Cotton
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cotton crops are best grown in black soil. It is also known as black cotton soil. Black soil contains a very high proportion of calcium and magnesium and so cotton plants can obtain their necessary requirements. 

Lettuce and other plants with short roots can grow in clayey soil.
So, option D "Çotton" is the correct answer.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

Fungi and bacteria grow mostly in

  1. Subsoil

  2. Top soil

  3. Bedrock

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

Fungi and Bacteria grow mostly in top soil. As Fungi is a saprophyte it feeds,on decay and some bacteria decomposes the fallen leaves into manures.

So, the correct answer is 'top soil'

Multiple choice evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

An area of soil is thoroughly wefted and allowed to drain until capillary movement of water stopped. The water contents of the soil will give an estimate of its

  1. Capillary water

  2. Storage water

  3. Field capacity

  4. Gravitational water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(c) The amount of water retained by a unit weight of undisturbed soil after complete drainage under controlled coniditions is called field capacity or holard.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

Loamy soil is best suited for the growth of 

  1. Mangroves

  2. Lentils

  3. Pulses

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Loamy soil has a good balance of sand, silt, and clay, providing excellent aeration and water retention, which is ideal for pulses and lentils.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

The quality of the soil is affected by which of the following factors?

  1. Dryness, water and low temperature

  2. Wind, rainfall and light

  3. Light, temperature and humidity

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soil quality is influenced by various environmental factors including wind, rainfall, light, temperature, and humidity, which affect soil formation and nutrient content.

Multiple choice evs soil : our life soil profile soil- our life soil and crops

The soil which is preferred for the growth of the paddy crops is 

  1. Clayey soil

  2. Loamy soil

  3. Sandy soil

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Clayey soil has high water retention capacity, which is essential for paddy crops that require standing water for growth.

Multiple choice evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

Consider the following fungi:
1. Arthrobotrys oligospora
2. Dactylella cionopaga
3. Streptorrryces rimosus
Which of these are predaceous for the biological control of nematodes in soil?

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arthrobotrys oligospora and Dactylella cionopaga are well-documented predatory fungi that trap and consume nematodes using specialized structures like adhesive nets or rings. Streptomyces rimosus (note spelling: Streptomyces) is a soil bacterium producing antibiotics, not a predatory fungus.