Why is soil erosion relatively less in dense forests as compared to barren, open fields?
In dense forests, the tree cover (canopy) prevents rain water from directly falling on the’ ground/soil. Also roots of the... View Article
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Continuously water-logged soils are disadvantageous for plant growth. Why?
The main functions of roots are water absorption and uptake of oxygen from the pore space of the soil. But... View Article
Rajasthan is a desert state in India. Once while travelling to Rajasthan by train, Boojho observed several streams and rivulets of rainwater during the journey but to his surprise, he did not see streams of water in the desert region even during rains. Help Boojho find a suitable explanation for this.
A large area of desert is covered by rocks and sand. When rain water falls on the land, it percolates... View Article
A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.
It is easier to dig soil initially because the upper layer of the soil consists of topsoil and subsoil. These... View Article
Is it a good practice to remove grass and small plants that are growing in an open, unused field? Give a reason to support your answer.
No, because the soil surface is covered by plants. Their roots connect the soil particles and hold them in place.... View Article
How can a farmer convert acidic soil to neutral soil?
It is possible to convert acidic soil into neutral soil by adding lime to the soil. Lime is alkaline and... View Article
Which of the following situations – ‘A’ or ‘B’ – is advantageous for the absorption of water and minerals? Why? Situation ‘A’: Growth and branching of roots in the C-horizon. Situation ‘B’: Growth and branching of roots in A and B horizons.
Situation ‘B’ is advantageous to plants because A and B-horizons are rich in water, minerals and humus. Explanation The A-Horizon... View Article
Read the following statements and give the appropriate terms for each of them. (a) The process of breakdown of rocks by the action of wind, water, sunlight. (b) Removal of topsoil during heavy rains or strong winds. (c) Accumulation of wastes in the soil generated by human activity which alter the features of the soil. (d) The process of movement of water into deeper layers of soil.
(a) Weathering The scenes of the world are continuously mutating. Sun, rain, frost, and wind are breaking down even the... View Article
The components of loamy soil are ______, ______ and ______.
sand, clay and slit Explanation Loamy soil is a mixture of sand, clay and silt. Besides these particles, the loamy soil... View Article
The soil has particles of different sizes. Arrange the words given below in increasing order of their particle size. (Rock, Clay, Sand, Gravel, Silt)
The words according to increasing order of their particle size are, Clay < Slit < Sand < Gravel < Rock... View Article
Read the following statements with reference to the soil. i) Weathering is a very fast process of soil formation. ii) Percolation of water is faster in sandy soils. iii) Loamy soil contains only sand and clay. iv) Topsoil contains the maximum amount of humus. Choose the correct statements from the above. (a) (ii) and (iv) (b) (i) and (iii) (c) (ii) and (iii) (d) (i) and (ii)
a) (ii) and (iv) Explanation Statements (ii) and (iv) are correct. Options (i) and (iii) are wrong. (i) Weathering is a... View Article
Soil conservation measures are mainly aimed at protecting which of the following? (a) Plants (b) Topsoil (c) Subsoil (d) Soil organisms
b) Top soil Explanation Topsoil is nutrients making and also rich in humus. It is fertile to grow plants. The... View Article
Availability of water and minerals in the soil for maximum absorption by roots is in the – (a) B-horizon (b) C-horizon (c) A-horizon (d) surface of soil
c) A-horizon Explanation A-horizon is also known as topsoil. This layer is basically porous, soft, and also can retain water. It... View Article
The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients. (a) Desert (b) Forest (c) Open field (d) Cricket ground
(b) Forest Explanation In forests, there will be a lot of trees which hold the soil and prevents soil from... View Article
Think and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.
To minimize waste and pollutants at their source the following measures can be taken: We should avoid use of plastic... View Article
Describe various steps of cleaning wastewater in a wastewater treatment plant.
Wastewater is passed through bar screens. Large objects like rags, sticks, cans, plastic packets, napkins are removed. Water then goes... View Article
A very _________ number of our people defecate in the open. It may cause _________ pollution and soil pollution. Both the surface water and _________ water get polluted. _________ water is the source for wells, tubewells and _________. Thus it becomes the most common route for _________ borne diseases like _________, dysentery, etc.
A very large number of our people defecate in the open. It may cause water pollution and soil pollution. Both the surface water and groundwater... View Article
The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?
Wastewater released by home, industry, hospital etc. are called sewage. The small and big pipes that takes away sewage is... View Article
What are the different types of inorganic and organic impurities generally present in sewage?
Different types of inorganic and organic impurities generally present in sewage are as follows: Inorganic impurities: nitrate, phosphate, metals etc.... View Article
A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease-causing bacteria and other microbes. Give names for (x), (a) and (b)?
Sewage is actually the wastewater that is released from houses, hospitals, industries, offices and other sources. It also includes the... View Article
