Tag: soil : our life

Questions Related to soil : our life

Which of the following is not correctly matched?

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

  1. Laterite- Contains aluminium

  2. Terra Rosa- Most suitable for roses

  3. Chernozem- Richest soil

  4. Black Cotton soil- Rich in calcium carbonate

Show answer
Correct Option: B
Explanation:

Laterite is a soil and rock type rich in iron oxide. It is reddish in colour. 

Terra rossa is a well-drained, red soil with neutral pH. It is seen in the Mediterranean region. It contains sand, silt clay and organic material. It is most suitable for roses. 
Chernozem is a black colour soil having a high percentage of humus. It also contains a high percentage of phosphoric acids, phosphorus and ammonia. This makes it the richest soil and is highly fertile.
Black cotton soil is formed by lava basaltic rocks. It is very dark in colour. It is rich in calcium and magnesium carbonate. 
Thus, the correct answer is 'Laterite - Contains aluminium.'

What percent of land area is covered by desert?

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

  1. 40%

  2. 17%

  3. 34%

  4. 10%

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Correct Option: B

Match the columns of size with soil particles

Column 1 (size) Column 2 (soil particle)
a. 0.2 - 2.00 mm (i) Silt
b. Less than 0.002 mm (ii) Clay
c. 0.02 - 0.2 mm (iii) Coarse sand particles 
d. 0.02 - 0.02 mm (iv) Fine sand particles
evs soil : our life soil profile soil- our life soil and crops

  1. a- iv, b- i, c- iii, d- ii

  2. a- iii, b- ii, c- iv, d- i

  3. a- ii, b- iii, c- iv, d- i

  4. None of the above

Show answer
Correct Option: B
Explanation:

Soil texture refers to the relative proportion of particles or it is the relative percentage by weight of the three soil separates i.e., sand, silt and clay or the size of soil particles. According to the International system, 

Clay< 0.002 mm
Silt 0.002 - 0.02 mm
Fine sand 0.02 - 0.2 mm
Coarse sand 0.2 -  2 mm
The proportion of each size group in a given soil (the texture) can not be easily altered and it is considered as a basic property of a soil.
Therefore, the correct answer is option B.

Why are earthworms important in soils?

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

  1. Earthworms are segmented which means that they cause more caverns for other bacteria

    and microbes to be present underground

  2. Earthworms produce fluids which enrich the soil aiding for nitrogen to be present for plant

    growth

  3. Earthworms inhibit gaseous exchange killing other bacteria which can be harmful to plants

  4. Earthworms ingest soil and excrete soil which allows for some chemicals to be

Show answer
Correct Option: B
Explanation:

Explanation: These burrows create pores through which oxygen and water can enter and carbondioxide can leave the soil. Earthworm casts (their faeces) are also very important in soils and are responsible for some of the fine crumb structure of soils.

In which one of the following pairs, is the specific characteristic of a soil not correctly matched?

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

  1. Chernozems - Richest soil in the world.

  2. Black soil - Rich in calcium carbonate and iron.

  3. Laterite - Contains aluminium compound.

  4. Terra rossa - Most suitable for roses.

Show answer
Correct Option: D
Explanation:

Chernozem is the black colored soil which is known for being rich in humus. This is the richest soil in the world and used for the cultivation of the cereals. Black soil is rich in calcium carbonate and iron. This soil also contains the lime, potash, aluminum, etc. Laterite soil contains the bauxite which is the ore of the aluminum. Terra Rossa is the red clayey soil. the soil formed from the limestone and is used for the production of the vine plants. 

Thus, the correct answer is option D. 

Which is not correctly matched ___________________.

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

  1. Laterite - Contains aluminium

  2. Terra rosa - Most suitable for roses

  3. Chernozen - Richest soil

  4. Black Cotton Soil - Rich in calcium carbonate

Show answer
Correct Option: B

Nature and properties of soil depends upon 

biology soil : our life soil properties soil - properties basics of soil pollution

  1. climate

  2. weathering process

  3. development of soil

  4. all of these

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Correct Option: D
Explanation:
Nature and properties of soil depends upon climate, weathering process and development of soil.
So, the correct option is 'all of these'

The pH of a fertile soil is usually around

biology soil : our life soil properties soil - properties basics of soil pollution

  1. 2-3

  2. 6-7

  3. 8-10

  4. 11-12

Show answer
Correct Option: B
Explanation:

Plants grow best in neutral or slightly acidic pH. Slight acidity favours tree growth and forms forests. Slight alkalinity is however, helpful in growth of grasslands and some crop plants like legumes. Hence, for most plants a pH value of 6 to 7 is favourable.

Soil salinity is measured by

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Porometer

  2. Potometer

  3. Conductivity meter

  4. Calorimeter

Show answer
Correct Option: C

Solubility and availability of plant nutrients are more related to

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Soil pH

  2. Soil porosity

  3. Soil temperature

  4. Soil colour

Show answer
Correct Option: B