Tag: soil : our life

Quizzes (12) Questions (114)

Questions Related to soil : our life

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

Which of the following is not correctly matched?

  1. Laterite- Contains aluminium

  2. Terra Rosa- Most suitable for roses

  3. Chernozem- Richest soil

  4. Black Cotton soil- Rich in calcium carbonate
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'

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

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

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

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

Why are earthworms important in soils?

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

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

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

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

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

Which is not correctly matched ___________________.

  1. Laterite - Contains aluminium

  2. Terra rosa - Most suitable for roses

  3. Chernozen - Richest soil

  4. Black Cotton Soil - Rich in calcium carbonate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Terra rosa is a reddish clay soil produced by the weathering of limestone, not specifically a soil for roses. The other matches are standard geographical definitions.

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

The pH of a fertile soil is usually around

  1. 2-3

  2. 6-7

  3. 8-10

  4. 11-12
Reveal answer Fill a bubble to check yourself
B Correct answer
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.