# Science in Category 7 Extraordinary Questions, Chapter 9

## Soil Class 7 Supplementary Question Chapter 9

### Soil Class 7 Science Further Questions Very Brief Reply Sort Questions

Query 1.
What number of teams of soil have been categorised?
Soil is assessed into four primary teams, specifically

Question 2.
Which nation is considered to be probably the most fertile and used for rising crops?
Salmon soil is the fertile and soil-growing soil.

Question 3.
What sort of soil absorbs more water however allows less wateMo percolate?
Clayey Soil Is Absorbed

Question 4
Give Formulation to Calculate Absorption Fee
Water absorption proportion could be calculated from the following components

Question 5.
When dry soil is added to the glass and mixed, bubbles are observed from the soil. What do these bubbles do? [HOTS] Answer:
When water is added to the glass and mixed, bubbles appear.

Question 6
What is the weather?
Weather is a natural process in which huge stones are divided into small particles, but very slowly.

Question 7.
On hot summer days above ground there is glowing air. What does the term glow indicate? [HOTS] Answer:
The term shimmering means that the air shines with a bit of vibrating light

Question 8
Draw a chart for displaying different soil layers

Question 9
Name two types of soil used for cultivation.
Clay soils and clay soils are rich in humus and are suitable for growing crops such as wheat and gram

Question 10
The soil has particles of different sizes. Arrange the words below in descending order of particle size. Stone, clay, sand, gravel, slurry [NCERT Exemplar] Answer:
Soil particles that have fallen in size can be represented by
Rock> gravel> sand> slurry> clay

Question 11.
There are two parts of the soil that come from a living thing and a non-living thing.
The two main components of the soil are faded stone particles, ie non-living parts and humus consisting of living organisms such as fungi, bacteria, carpets, insects, etc. [19659004] Question 12
It is necessary to prohibit the use of polyethylene bags and plastics. Do you agree? If yes, why? [HOTS] Answer:
Polyethylene bags and plastics pollute the soil as they kill living organisms in the soil.
It is therefore necessary to ban the use of polyethylene bags and plastics

Question 13.
List of soil pollutants
Soil pollutants are polyethylene bags, plastic, waste, chemicals, pesticides, etc.

Question 14
Special soil is used to make journeys and rafts. Name it. [HOTS] Answer:
Clayey soil is used to make journeys and rafts.

Question 15.
Explain the term humus, which usually occurs on the top floor of the soil.

Question 16.
Can toys be made on ground soil? Explain:
No, field ground cannot be used to make toys. To make toys, the soil should be clay

Question 17.
The rate of coating varies from one soil to another.
The elevation of water is the highest in the sandy soil, while the smallest clay in the soil.

Question 18
Does a farmer convert acid soils into neutral soil? [NCERT Exemplar] Answer:
A farmer can transform acid soils into neutral soils by adding a small amount of limestone or slaked lime to the soil.

Question 19
Does all soils absorb the same amount of water?
No, it is because different soils have different water absorbency.

Question 20.
Rice for planting what kind of soil would be most.
Paddy (rice) planting is well suited for organic clay soils with good water retention capacity.

### Soil Category 7 Science Extra Questions Short Answer to Type Questions

] Question 1.
Soil is said to be an integral part of our lives. Why?
Soil is one of the most important natural resources. It is the upper layer of the earth's crust, black in color. The most important functions of the soil are:

• It supports plant growth by firmly holding the roots and supplying plants with water and nutrients.
• It acts as a natural habitat for many organisms, such as earthworms, fungi, bacteria, ants, etc.
• It is also important for agriculture that provides us with food, clothing and protection for everyone.
• It supplies water and nutrients to plants.

That's why we can say that soil is an integral part of our lives.

Question 2.
Suppose that a particular sample lasts 120 minutes for 960 ml of water to precipitate in the soil. Calculate the percolation rate of water
given, amount of water = 960 ml
The time it takes to percolate = 120 min
the percolation rate is

Percolation rate = 8 ml / min

Question 3.
Find the following zones, which are marked as boxes in the picture with a diagram of the soil profile.
Soil, Soil, Bedrock [NCERT Exemplar]

It is the top layer of soil, and It is usually a dark color because it contains minerals and humus. it. It provides nutrients in plants because the roots of most plants are limited to this layer. Humus is a dark brown colored layer consisting of dead, degenerate plant and animal residues.

This soil is situated slightly below the soil. It consists of barely bigger stone particles than topcoat. It doesn't have much humus and is lighter than the soil. It’s a bit more durable and extra compact than soil. This layer is much less fertile than soil and accommodates little dwelling organisms. Soil is rich in minerals and iron oxides

Under the C horizon there is a unfastened rocky rock referred to as rock. It is non-porous and may produce soil for a long time.

Question 4.
The scholar visits two varieties of area and factors out that ground A has a excessive percolation fee, while B-field soil is low. The crops grown in area B have been cultivated when there was no everlasting crop in subject A. Identify two soils in two fields. [HOTS] Reply:
The soil in subject A is sandy soil, whereas in subject B the soil is a clayey soil with low percolation fee and water purification. Since paddy requires loads of standing water, it’s grown in subject B.

Question 5.
Describe how clay soils are useful for crops?
Clayey soil is beneficial for crops

• It is ample in humus
• It is fertile in nature
• Crop crops comparable to wheat and rice could be easily grown in clay soils.

Query 6
Learn and agree on the following statements
(a) The process of breaking stones underneath the affect of wind, water, daylight
b) Removing of soil throughout
c) Soil waste from human activity that change soil properties.
d) Shifting water deeper into the soil. [NCERT Exemplar] Reply:
The terms of the above statements are as follows
(a) Weather resistance
(b) Soil erosion
c) Soil pollution
(d) Percolation
There are three totally different soils

• A sandy soil containing sand particles
• Clay soils include a small quantity of humus in it. It is fertile soil.
• Loamy soil is a mix of sand, clay and humus. It is fertile soil

Question 8
Rajasthan is a desert in India. When traveling to Rajasthan by practice, Boojho found a number of currents and rainwater through the trip, however due to his surprise he did not see the water flows in the desert even in the course of the rain. Help Boojho find the correct rationalization for this. [NCERT Exemplar; HOTS] Answer:
Deserts include sand, so when rainwater falls to the bottom, it evaporates instantly between the sand particles. So the water streams in the desert aren’t even seen in the course of the rainy season.

Query 9.
The human excavator found that he might dig simply at first, but digging was troublesome when he went deeper. He couldn't be greater than the depth of 5 ft. Give applicable scientific explanations. [NCERT Exemplar; HOTS] Answer:
A person who digs a pit might dig simply easily due to the presence of soil and soil (mainly humus and vitamins). However when he digs deeper, it is troublesome for him to dig into a depth of more than 5 meters as a result of the decrease layers are made up of small, partially decayed rocks with cracks, cracks and bedrock, which makes it troublesome to dig.

Query 10
Constantly drawn soils are disadvantageous for plant progress. Why? [NCERT Exemplar] Answer:
Roots, though underground there live cells that require oxygen for respiration and power manufacturing. They take up oxygen that is present between the soil particles. Nevertheless, the water is logged into the soil and pulls oxygen into the environment. So roots stay oxygen-free and this affects plant progress

Query 11.
Is it good apply to remove grass and small crops that develop in an open, unused area? Give a purpose to help the reply. [NCERT Exemplar; HOTS] Reply:
No, it's not a great follow to take away grass and small crops that develop in an open, unused area as a result of the crops cover the soil. Their roots bind soil particles, hold on and persist with them.
In this approach, soil erosion is prevented and the soil layer is maintained to develop the rising crops.

Query 12.
Query 12.
The next determine and answers to the following questions

(a) What’s the heaviest combination?

(c) Why are the elements of different soil shaped?
(a) The crown is the heaviest stone materials
. b) Humus is the lightest a part of the soil floating on the floor of the water.
(c) The soil element varieties a unique layer above one another, depending on the dimensions of the soil particles.

Question 13.
Through the summer time trip, Gaurav visited the home village. He famous that farmers used pesticides in their subject. He contacted the village and defined to him the consequences of these substances on soil contamination. The subsequent day, the village head referred to as a gathering of all the villagers and guaranteed the villagers not to use chemical compounds and pesticides.
(a) Why Prohibit Polyethylene Luggage and Plastics.
(b) Listing of some soil pollutants
(c) What are the values ​​proven by Gauravi? [Value Based Question] Answer:
a) Simply because these substances pollute the soil.
(b) Soil pollution embrace quite a few waste merchandise, chemical compounds, pesticides, polyethylene luggage and plastics.
c) Alarm, duty and environmental friendliness.

Question 14.
Write the difference between the percolation price and the quantity of water retained.
The percolation property of any materials is said to its porosity.
That is why water evaporates in another way by way of totally different soil
Water drilling fee in soil

$= frac Water volume Time taken to percolate$
Because soil water retention is described as the amount of water absorbed by a specific sort of soil.

Query 15.
Why is soil erosion in dense forests relatively less than in tough open fields? [NCERT Exemplar; HOTS] Reply:
In dense forests, a tree cowl (cover) prevents rainwater from falling immediately into the ground / soil. The roots of vegetation also bind the soil particles and hold them together. In consequence, soil erosion is minimized
However in tough, open fields the soil is uncovered to falling rain. Soil particles are launched by the rain drops and the water move transports them away.

Query 16.
Gardeners typically dig the soil around the roots of backyard crops (crops) regularly. Give causes. [NCERT Exemplar. HOTS] Answer:
The gardener typically digs the soil around the roots of garden crops or herbs for the following reasons

• It allows straightforward root progress
• To make water simpler. soil that permits access to deeper soil layers

### Soil class 7 Science Further questions Long answer Sort Questions

Question 1.
Explain that the soil has moisture
Take a plastic hopper and filter paper. Fold the filter paper and place it in a plastic funnel. Now maintain the funnel (with filter paper) in the beaker. Take dry ground and weigh it to stability.
Notice the mass of the soil taken. Now pour this weighed soil into the filter paper hooked up to the funnel

Take the measuring cylinder and fill it with water. Word the initial quantity of water in the measuring cylinder. Pour water from the flask with a dropper and pour it dropwise into the bottom in the funnel. Be careful not to permit the water to settle in the ground, however pour it evenly over the soil. Maintain pouring water until it drips from the underside of the hopper.
The drop of water from the funnel exhibits that the soil taken up by the filter paper has absorbed the utmost quantity of water. Notice the ultimate amount of water left unused in the measuring cylinder

By decreasing the quantity of water remaining in the measuring cylinder from the unique volume of water taken into the measuring cylinder. We get the quantity of water absorbed by the soil taken into the filter paper in the funnel. The difference between two remedies provides the amount of water left on the soil. Calculation might be accomplished as follows:
Suppose that the mass of soil taken = 50 g
Enter the amount of water U = 100 ml
and the final water volume V = 60 ml
Subsequently, the amount of water absorbed by the soil = (U-V) ml = (100 – 60) ml = 40 ml
and weight of water absorbed by soil = (U – V) Q = (100 – 60) g = 40 g
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Once we run this action on totally different soil samples, we see it .

• Sandy soil absorbs less water and allows extra water to percolate.
• Clayey soil absorbs more water but provides much less water
• Sandy soil absorbs much less water than clay soils as a consequence of giant areas between soil particles. An area where there’s numerous clay in the soil, the stagnant water collects above the soil when it rains.

Question 2
Plan for soil erosion on rugged lands
Powerful wind and rain may cause soil erosion on a rugged land. This can be demonstrated by performing an activity.
Take a bit of wooden and place the ground or sand on it. Hold the ice cube tray at the different end of the picket black. Take a small battery-powered fan or hair dryer and maintain it towards the sand near the black so that it blows into the sand tray.

Notice that when the blower blows, it causes sand or soil particles to cross they usually get ground in a special compartment of the ice cube base. This exercise demonstrates that the wind blows the soil right into a rugged land and may cause soil erosion

Question 3
Soil contamination in waste materials causes soil contamination. Does the use of pesticides in agriculture also damage soil contamination? Clear.
Soil pollution is referred to as soil contamination of polyethylene bags and plastics, pesticides, fertilizers, industrial waste industrial wastes, etc.

Pesticides are toxic chemicals. substances injected into permanent crops to destroy them from harmful insects and diseases. Some of these pesticides are also mixed with soil soil and pollute it. Cereals, fruits and vegetables grown in this contaminated soil contain pesticides. When we eat such contaminated grains, fruits or vegetables, the pesticides they contain also damage health.

Question 4
The soil sample was taken from agricultural land and weighed. The soil mass was found to be 50 g. 100 ml of water was taken into the measuring cylinder and added to the soil sample. Soil absorbed 80 ml of water and the remainder left in the measuring cylinder. Calculate the rate of soil water absorption. [HOTS] Answer:
Soil water absorption rate can be calculated using the following formula:

<img class = "alignnone size-full wp-image-76053" src = "https 😕 //i2.wp.com/www.learncbse.in/wp-content/uploads/2019/06/Soil-Class-7-Extra-Questions-Science-Chapter-9-6.png resize = 354% 2C222 & ssl = 1 "alt =" Science of Soil Class 7 Additional Questions Chapter 9 [19659101] Soil has absorbed 40 % of water

Question 5.
a) There are several necessary elements of soil
(b) Organize the following particles that appear in the soil in ascending order. Tag, clay, gravel, sand
(c) Comply with the following image

(a) The important part of the soil is air, water, particles, minerals, humus and living organisms such as bacteria, fungi, carpets (murmurs), rodents, insects (ant and beetle, etc.)
(b) The increasing order of stone particles is
Clay → Label → Sand → Gravel
(c ) The picture shows waste materials such as polyethylene bags, plastic, glass and metal objects that cause soil contamination

Question 6.
In general, drilling rigs have to be dug very deeply in towns to get the water, while in the villages dug wells. Give proper reasons. [NCERT Exemplar; HOTS] Answer:
The bottom shells have to be excavated very deeply to get water than in villages, because excessive use of water

• consumes groundwater.
• cities have asphalt roads and large areas of soil are concreted. As a result, rainwater cannot be absorbed by groundwater loading and the groundwater level continues to fall. The villages have larger areas with open soils and fewer asphalt roads and concrete surfaces.

Thus, the surface area of ​​the rainfall is higher so that the rainfall easily reaches the soil and recharges the groundwater. As a result, even low drilling pipes produce water

Question 7.
Soil erosion does not happen easily if the ground is covered with vegetation. Do you agree? Explain:
Yes, soil erosion does not happen easily if the land is under vegetation (trees and other plants). It happens easily in areas with no vegetation (trees and other plants) or with very little vegetation. If the land has vegetation,

• the roots of vegetation growing in the soil will firmly bind soil particles. As a result, inflatable wind and flowing rainwater are not able to convey surface soil and thus soil erosion does not occur
• then a large part of the falling rain falls on trees and plants before it hits the ground. In this way, vegetation covers the impact of soil rain.

Question 8
Raw and roasted soil differ. How are they different? How can you make trips from the country? [HOTS] Answer:
Raw soil differs from fried soil. Crude soil is white or dull black color. It contains water and air and can be molded.

The baked soil is a heated raw soil that lost its water molecule due to heating and turns red. When the soil gets hot, it cannot be molded into another shape. Clay soils are used for the manufacture of mugs, toys, boilers, etc. Soil is kneaded with horse manure so that raw clay soil is of the best quality. This knotted land is then placed on the wheel and given a suitable shape. The final shape of the material is given at hand. The pots and the trips are then stored for three days to dry.

Question 9
Some students visited the farm and saw a few birds eating green vegetables. They enjoyed the place and then they started picking and killing the green vegetables. Seeing the corner of the pupil's group, the teacher rushed to see them and resisted their actions. Anshul, one student asked for a reason.
The teacher smiled and explained to him that the soil in the ground is very useful for farmers. Anshul wondered if there were other organisms in the soil. The teacher appreciated her and explained.
(a) Mention the meaning of earthworms.
(b) List some of the living organisms in the soil
(c) What are the values ​​presented by Anshul? [Value Based Question] Answer:
(a) Earthworms help to make plenty of humus in the soil.
(b) Antti, green, termites, boulders, mussels, etc.
(c) Curiosity to learn and scientific attitude

Question 10.
A soil sample of 200 grams was taken from the garden. This soil was completely dried in the oven and again weighted. Soil weight was now found to be 170 g. Calculate the percentage of water or moisture content in the sample. [HOTS] Answer:
Soil moisture content can be calculated using the following formula:

Soil initial mass = 200 g
Drying of soil after drying = 170 g
Then soil mass of water
= 200 – 170 = 30 g
The percentage of water in the soil will be

### Soil Class 7 Science Additional questions Other questions

Multiple choice questions
Question 1
B horizon is also called
(a) topcoat
(b) soil
(c) base stone
(d) substrate

(b)) Lower layer

Question 2.
Micro-soil in the soil Organisms require moisture (water) and nutrients for growth and survival. From the options below, select the habitat (place) where the soil is rich in water and nutrients. [NCERT Exemplar] (a) Desert
(b) Forest
c) Open Field
d) Cricket Land